X-ray imaging apparatus and method of operating the same

An X-ray imaging apparatus and a method of operating the X-ray imaging method are provided. The X-ray imaging apparatus includes a first panel configured to contact an object; an X-ray generator configured to maintain a uniform distance with the first panel and configured to generate an X-ray; a second panel facing the first panel and configured to contact the object; and an X-ray detector configured to detect the X-ray transmitted to the object.

RELATED APPLICATION

This application claims priority from Korean Patent Application No. 10-2013-0073967, filed on Jun. 26, 2013, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.

BACKGROUND

Apparatuses and methods consistent with the exemplary embodiments relate to an X-ray imaging apparatus using an X-ray and a method of operating the X-ray imaging apparatus.

2. Description of the Related Art

X-rays are used in performing non-destructive testing, structural and physical properties testing, image diagnosis, security inspection, and the like in the fields of industry, science, medical treatment, etc. Generally, an imaging system using X-rays for such purposes includes an X-ray generator for radiating an X-ray and an X-ray detector for detecting X-rays that have passed through an object.

The X-ray detector is being rapidly converted from a film method to a digital method, whereas the X-ray generator uses an electron generation device using a tungsten filament type cathode. Thus, a single electron generation device is mounted in a single X-ray imaging apparatus. The X-ray detector is generally implemented as a flat panel type, which is problematic since there is a distance between the X-ray generator and the object when obtaining an image from the single electron generation device. Furthermore, the object needs to be imaged from a single X-ray generator, which makes it difficult to select and image a specific part of the object.

SUMMARY

An exemplary embodiment includes an X-ray imaging apparatus including a flat panel type X-ray generator and a method of operating the X-ray imaging apparatus.

An exemplary embodiment includes an X-ray imaging apparatus capable of obtaining a tomography image and a method of operating the X-ray imaging apparatus.

An exemplary embodiment includes an X-ray generator capable of adjusting a radiation angle of an X-ray, an X-ray imaging apparatus including the X-ray generator, and a method of operating the X-ray imaging apparatus.

An exemplary embodiment includes an X-ray imaging apparatus operable to detect an object and radiate an X-ray only to the object and a method of operating the X-ray imaging apparatus.

According to an exemplary embodiment, an X-ray imaging apparatus includes: a first panel configured to contact an object; an X-ray generator configured to maintain a uniform distance with the first panel and configured to generate an X-ray and transmit the X-ray to the object; a second panel facing the first panel and configured to contact the object; and an X-ray detector configured to detect the X-ray transmitted by the X-ray generator to the object.

The X-ray generator may is configured to move towards or away from the object.

A first surface of the first panel is configured to contact the object and a second surface facing the first surface is configured to contact the X-ray generator.

The X-ray generator and the first panel may be integrated.

A first surface of the second panel is configured to contact the object and a second surface facing the first surface is configured to contact the X-ray detector.

At least one of the first panel and the second panel may press the object.

When an X-ray generation area of the X-ray generator is smaller than a test area of the object, the X-ray generator is configured to move so as to transmit an X-ray to an entire test area of the object.

The X-ray generator is configured to radiate the X-ray in a first area of the object and configured to move so as to radiate the X-ray in a second area of the object.

The X-ray generator is configured to move horizontally along the first panel.

When an X-ray detection area of the X-ray detector is smaller than a test area of the object, the X-ray detector is configured to move so as to detect an X-ray that was transmitted to an entire test area of the object.

The X-ray detector is configured to detect the X-ray that was transmitted to a first area of the object and move to detect the X-ray that was transmitted to a second area of the object.

The X-ray detector is configured to move horizontally along the second panel.

The X-ray imaging apparatus may further include: a gantry including the first panel, the X-ray generator, the second panel, and the X-ray detector.

The X-ray generator may include a plurality of X-ray sub-generators arranged in one dimension or in two dimensions.

The X-ray generator may change a radiation angle of an X-ray transmission according to a location of the object.

The X-ray imaging apparatus may further include: a sensor configured to sense the object, wherein a partial region of the X-ray generator corresponding to a location of the object generates the X-ray.

According to an exemplary embodiment, an X-ray imaging method includes: pressing an object located between a first panel and a second panel by using at least one of the first panel and the second panel; generating an X-ray by an X-ray generator located a uniform distance from the first panel; transmitting by the X-ray generator the generated X-ray to the object; and detecting by the X-ray detector the X-ray transmitted to the object.

The X-ray generator is configured to move towards and away from the object.

When an X-ray generation area of the X-ray generator is smaller than a test area of the object, the X-ray generator may move along the first panel to radiate an X-ray in the entire test area of the object.

When an X-ray detection area of the X-ray detector is smaller than a test area of the object, the X-ray detector may move along the second panel to detect an X-ray that was transmitted to the entire test area of the object.

According to an exemplary embodiment, an X-ray imaging apparatus includes: a first panel configured to contact an object; an X-ray generator which is integrated with the first panel in order to maintain a uniform distance with the first panel and configured to generate an X-ray and transmit the X-ray to the object; a second panel facing the first panel and configured to contact the object; and an X-ray detector configured to detect the X-ray transmitted by the X-ray generator to the object.

The X-ray generator comprises a plurality of sub-generators and each of the plurality of sub-generators are configured to generate an X-ray.

Each of the plurality of sub-generators comprise a plurality of sensors which sense the object.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the exemplary embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Also, the thickness or size of each element illustrated in the drawings may be exaggerated for convenience of explanation and clarity. Accordingly, the exemplary embodiments are merely described below, by referring to the figures, to explain aspects of the present description.

The attached drawings for illustrating exemplary embodiments are referred to in order to gain a sufficient understanding of the exemplary embodiments, the merits thereof, and the objectives accomplished by the implementation of the exemplary embodiments. The exemplary embodiments may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein; rather, these exemplary embodiments are provided such that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to one of ordinary skill in the art.

Hereinafter, the terms used in the specification will be briefly described, and then the exemplary embodiments will be described in detail.

The terms used in this specification are those terms currently widely used in the art in consideration of functions in regard to the exemplary embodiment, but the terms may vary according to the intention of those of ordinary skill in the art, precedents, or new technology in the art. Also, specified terms may be selected by the applicant, and in this case, the detailed meaning thereof will be described in the detailed description of the exemplary embodiment. Thus, the terms used in the specification should be understood not as simple names but based on the meaning of the terms and the overall description of the exemplary embodiment.

In the present specification, an object may include a human being or an animal, or a part of the human being or the animal. For example, the object may include organs, such as the liver, the heart, the uterus, the brain, breasts, the abdomen, or blood vessels. In the present specification, a “user” is a medical expert, for example, a doctor, a nurse, a medical specialist, and a medical imaging expert, or an engineer managing medical apparatuses; however, the exemplary embodiments are not limited thereto.

FIG. 1is a schematic perspective view of an X-ray imaging apparatus100according to an exemplary embodiment. The X-ray imaging apparatus100ofFIG. 1is a mammography apparatus that images a breast but is not limited thereto. The X-ray imaging apparatus100may apply to an X-ray imaging apparatus that contacts an object and generates an X-ray.

Referring toFIG. 1, the X-ray imaging apparatus100includes an X-ray generator10that generates the X-ray, an X-ray detector20that detects the X-ray that is transmitted to an object200, and panel32and the panel34that may contact the object200. The X-ray imaging apparatus100may further include a gantry40that supports the X-ray generator10, the X-ray detector20, and the panel32and the panel34, and a main body50that supports the gantry40.

The main body50may include a user input device52in which a user may input a command to operate the X-ray imaging apparatus100, a processor (not shown) that generates an image corresponding to the transmitted X-ray, a display54that displays the generated image, and a controller (not shown) that controls general operations of the X-ray imaging apparatus100. The user input device52, the processor (not shown), the display54, and the controller (not shown) may not be necessarily included in the main body50, and may be implemented as external devices that may communicate with the X-ray imaging apparatus100by wire or wireless sly.

The gantry40may be fixed to the main body50via a gantry driver42. The gantry40may be located on one side surface of the main body50longitudinally. The gantry driver42may rotate the gantry40by 360° or at an angle. In addition, the gantry driver42may operate to move the gantry40up and down longitudinally with respect to the main body50. Thus, the gantry driver42may move the gantry40up or down longitudinally with respect to the main body50so that a height of the gantry40may be adjusted in accordance with the object200, and may rotate the gantry40.

The panel32and the panel34may contact the object200, for example, the first panel32and the second panel34, may be located on the front of the gantry40. The first panel32and the second panel34may move up and down by using a guide groove44that is longitudinally included on the front of the gantry40. Thus, if the object200, for example, breasts of a patient, is placed between the first panel32and the second panel34, at least one of the first panel32and the second panel34may press the object200to compress the object200. For example, the second panel34may move up or down to allow the object200to be positioned on the second panel34and then the first panel32may move down to press the object200and compress the object200.

The X-ray generator10that generates the X-ray may be located on the first panel32. The X-ray generator10may be moved away from or closer to the object200while maintaining a distance d with the first panel32. For example, the X-ray generator10may be integrated with the first panel32so that the X-ray generator10and the first panel32may move along the guide groove44.

In more detail, when the first panel32presses the object200, since the X-ray generator10radiates the X-ray toward the object200, a distance between the X-ray generator10and the object200may be minimized. For example, the distance between the X-ray generator10and the object200may be about 10 cm. Thus, the emission of X-ray radiation to a region other than the object200may be prevented, thereby minimizing the amount of X-ray radiation which is emitted. To minimize the distance between the X-ray generator10and the object200, the X-ray generator10may be located so as to contact a side of the object200, such as the top side of a human breast. The X-ray generator10includes a plurality of X-ray sub-generators300, which will be described later.

The X-ray detector20that detects the X-ray that is transmitted to the object200may be provided under the second panel34. The X-ray detector20may be moved away from or closer to the object200while maintaining a distance d with the second panel34. For example, the X-ray detector20may be integrated with the second panel34so that the X-ray detector20and the second panel34move along the guide groove44.

In more detail, when the object200is positioned on the second panel34, since the X-ray detector20detects the X-ray that is transmitted to the object200, a distance between the X-ray detector20and the object200may be minimized. Thus, the X-ray may be more exactly detected. To minimize the distance between the X-ray detector20and the object200, the X-ray detector20may be disposed to contact a side of the object200such as a bottom side of a human breast. The X-ray detector20includes a plurality of X-ray detectors, which will be described later.

The X-ray generator10will now be described in more detail below.FIGS. 2A and 2Bare schematic diagrams of X-ray generators10aand10bincluding the plurality of X-ray sub-generators300according to an exemplary embodiment. Referring toFIG. 2A, the X-ray generator10amay include X-ray sub-generators300arranged in one dimension. Referring toFIG. 2B, the X-ray generator10bmay include the X-ray sub-generators300arranged in two dimensions.

Each of the X-ray sub-generators300may be independently driven to generate an X-ray. Accordingly, all of the X-ray sub-generators300may be driven to radiate X-rays toward the object200or only some of the X-ray sub-generators300may be driven to radiate X-rays to the object200. At least one of the X-ray sub-generators300may radiate X-rays to all regions of the object200or to only a specific region. In addition, at least one of the X-ray sub-generators300may be simultaneously or sequentially driven. In this case, only some X-ray sub-detectors corresponding to the X-ray sub-generators300that are being driven may be driven.

Although the X-ray sub-generators300are respectively formed on a single substrate, such as substrate11and substrate12inFIGS. 2A and 2B, the exemplary embodiment is not limited thereto. Each of the X-ray sub-generators300may be separately manufactured and the X-ray sub-generators300may be assembled into the X-ray generators10aand10b. Alternatively, some of the X-ray sub-generators300may be formed on a single substrate and then assembled together with other X-ray sub-generators300formed on other substrates. For example, an X-ray generator which is two dimensional may be manufactured by generating X-ray generators in one dimension on a single substrate and arranging the X-ray generators in one dimension. Although not shown, an X-ray controller can be provided to control a proceeding path of an X-ray generated by each of the X-ray sub-generators300so as to not interfere with a neighboring X-ray. In the X-ray controller, an opening is formed in an area corresponding to each of the X-ray sub-generators300and an X-ray absorbing material may be formed in a grid type in the other area (for example, a boundary area between the neighboring X-ray sub-generators300).

FIGS. 3A to 3Dare schematic diagrams of X-ray sub-generators300a,300b,300c, and300daccording to exemplary embodiments. Referring toFIG. 3A, the X-ray sub-generator300amay include an electron emission device310athat may emit electrons and an anode electrode320athat may emit an X-ray by collision of the emitted electrons. The anode electrode320amay include metal or a metal alloy such as tungsten (W), molybdenum (Mo), silver (Ag), chromium (Cr), iron (Fe), cobalt (Co), copper (Cu), etc.

The electron emission device310amay include a cathode electrode312and an electron emission source314arranged on the cathode electrode312that emits electrons. The cathode electrode312may be metal such as titanium (Ti), platinum (Pt), ruthenium (Ru), gold (Au), Ag, Mo, aluminum (Al), W, or Cu, or a metal oxide such as indium tin oxide (ITO), aluminum zinc oxide (AZO), indium zinc oxide (IZO), tin oxide (SnO2), or indium oxide (In2O3). The electron emission source314may be formed of a material capable of emitting electrons. For example, the electron emission source314may be formed of metal, silicon, an oxide, diamond, diamond like carbon (DLC), a carbide compound, a nitrogen compound, carbon nanotube, carbon nanofiber, etc.

The cathode electrode312applies a voltage to the electron emission source314. When a voltage difference occurs between the electron emission source314and the anode electrode320a, that is, the cathode electrode312and the anode electrode320a, the electron emission source314emits electrons and the electrons collide with the anode electrode320a. Accordingly, the anode electrode320aradiates an X-ray due to the collision of electrons.

As shown inFIG. 3B, an electron emission device310bof the X-ray sub-generator300bmay further include a gate electrode316between the electron emission source314and the anode electrode320a. The gate electrode316may be formed of the same material as the cathode electrode312. The electron emission source314may emit electrons by the voltage difference between the gate electrode316and the cathode electrode312. As the gate electrode316is arranged between the cathode electrode312and the anode electrode320a, the electrons induced by the electron emission source314by the voltage applied to the gate electrode316may be controlled. Accordingly, the X-ray sub-generator300bmay more stably control the emission of electrons.

In addition, as shown inFIG. 3C, an electron emission device310cof the X-ray sub-generator300cmay further include a focusing electrode318between the electron emission source314and an anode electrode320b. The focusing electrode318may be formed of the same material as the cathode electrode312. The focusing electrode318focuses the electrons emitted from the electron emission source314on an area of the anode electrode320bso as to collide therewith. A voltage applied to the focusing electrode318may be the same as or similar to the voltage applied to the gate electrode316so that an optimal focusing performance may be maintained.

As shown inFIG. 3D, an electron emission device310dof the X-ray sub-generator300dmay include the cathode electrode312, the electron emission source314arranged on the cathode electrode312that emits electrons, the gate electrode316spaced apart from the cathode electrode312, and the focusing electrode318focusing the emitted electrons.

FIG. 4illustrates an electron emission device400including a gate electrode420, according to an exemplary embodiment.

Referring toFIG. 4, the electron emission device400may include a cathode electrode410, the gate electrode420having a mesh structure spaced apart from the cathode electrode410, a plurality of insulation layers430and a plurality of electron emission sources440that extend in a first direction between the cathode electrode410and the gate electrode420and are spaced apart from each other. A substrate450for supporting the electron emission device400may be formed of an insulation material such as glass. The substrate450may support a single electron emission device400or the electron emission devices440.

The cathode electrode410and the gate electrode420may be formed of a conductive material. The cathode electrode410may apply a voltage to each of the electron emission sources440and may have a flat panel shape. When the cathode electrode410has a flat panel shape, the substrate450may not be necessary. The gate electrode420may have a mesh structure including a plurality of openings H. For example, the gate electrode420may include a plurality of gate lines422separated from each other and arranged on the insulation layers430and a plurality of gate bridges424connecting the gate lines422. Accordingly, the two neighboring gate lines422and the two neighboring gate bridges424form the openings H.

The openings H may be arranged to expose at least a part of the electron emission sources440between the insulation layers430. As described above, since the gate electrode420has a mesh structure, a large electron emission device400may be manufactured. Although the openings H of the gate electrode420are each rectangular inFIG. 4, the exemplary embodiment is not limited thereto. The shape of the openings H can also be, for example, circles, ovals, and polygons. The sizes of the openings H of the electron emission device400may be identical or different.

The insulation layers430are arranged between the cathode electrode410and the gate electrode420and prevent an electrical connection between the cathode electrode410and the gate electrode420. The insulation layers430are arranged in multiple numbers and at least three insulation layers430may be provided. The insulation layers430may have a linear shape. The insulation layers430extend in one direction and are separate from one another and support the gate electrode420. The insulation layers430may each include a first insulation layer432supporting an edge area of the gate electrode420and a second insulation layer434supporting a middle area of the gate electrode420.

The insulation layers430may be formed of an insulation material used for a semiconductor device. For example, the insulation layers430may be formed of hafnium(IV) oxide (HfO2), aluminum oxide (Al2O3), or silicon nitride (Si3N4), which is a high-K material having a higher dielectric rate than SiO2.

Although the insulation layers430have a linear shape inFIG. 4, the present exemplary embodiment is not limited thereto. The insulation layers430may have a different shape that prevents an electrical connection between the cathode electrode410and the gate electrode420and supports the gate electrode420. For example, the second insulation layer434may have a column shape and may be arranged under the gate lines422.

The electron emission sources440emit electrons due to the voltage applied to the cathode electrode410and the gate electrode420. The electron emission device400ofFIG. 4may include the electron emission sources440. The electron emission sources440may be alternately arranged with the insulation layers430. For example, the electron emission sources440may be spaced apart from one another with the second insulation layer434interposed between the neighboring electron emission sources440. The electron emission sources440may have formed of strips extending in the first direction, which is a direction similar to the second insulation layer434.

Since the gate electrode420has a mesh structure, the gate electrode420is arranged above the electron emission sources440. The electron emission sources440may be spaced apart from the gate electrode420to prevent the electron emission sources440and the gate electrode420from being short-circuited.

The electron emission sources440may be formed of a material capable of emitting electrons. As an area occupied by the electron emission sources440in the electron emission device400increases, the electron emission device400may emit a large amount of electrons. However, the electron emission device400may endure an electrostatic force due to a difference in the voltages applied between the electron emission sources440and the gate electrode420. Accordingly, the insulation layers430and the electron emission sources440are alternately arranged, and the gate electrode420having the opening H is arranged over an area where each of the electron emission sources440is arranged, thereby implementing the large area electron emission device400.

Since the gate electrode420includes the gate bridges424arranged in a direction crossing the lengthwise direction of the electron emission sources440, a uniform electric field may be formed on surfaces of the electron emission sources440.

Although the electron emission sources440are formed in strips inFIG. 4, the present exemplary embodiment is not limited thereto. The electron emission sources440may be formed as a point type in an area corresponding to the opening H above the cathode electrode410. The point-type electron emission sources440may be arranged in a two dimensional array, that is, in a matrix format.

Although the electron emission sources440are arranged in the single electron emission device400inFIG. 4, the present exemplary embodiment is not limited thereto. Also, only one electron emission source may be arranged in the electron emission device400or two or more electron emission sources may be arranged in the electron emission device400.

A path of the X-ray may be controlled by the shape of an anode electrode. In detail, if the thickness of the anode electrode is provided to be of an irregular thickness, the path at which the X-ray radiated from the anode electrode proceeds may be controlled.

FIGS. 5A to 5Gillustrate anode electrodes having irregular thicknesses according to exemplary embodiments. The anode electrode illustrated in each ofFIGS. 5A to 5Gcorresponds to a single X-ray generator. However, the present exemplary embodiment is not limited thereto. One anode electrode may correspond to one electron emission device. For convenience of explanation, one anode electrode corresponding to the single X-ray generator will be described below.

As shown inFIGS. 5A to 5G, the anode electrode may be symmetrically provided about a center axis Z of the X-ray generator10so that an X-ray may be symmetrically radiated.

The thicknesses of anode electrodes510and520gradually decrease from the center axis Z of the X-ray generator10toward edges thereof, as illustrated inFIGS. 5A and 5B. When the thicknesses of the anode electrodes510and520gradually decrease from the center axis Z of the X-ray generator10toward edges thereof, X-rays radiated from the anode electrodes510and520may propagate so as to be focused at the center axis Z of the X-ray generator10. Thus, the X-ray generator10may efficiently radiate an X-ray toward a part of the object.

In more detail, surfaces512and522of the anode electrodes510and520, on which electrons are incident, may be flat surfaces, whereas surfaces514and524from which X-rays are emitted may be convex surfaces. The surfaces514and524from which X-rays are emitted may be convexly curved surfaces or convex surfaces obtained by combining flat surfaces. A position where the X-ray is focused may be determined by levels, θ and R, of the convex shape. Although inFIGS. 5A and 5Bthe surfaces512and522of the anode electrodes510and520, respectively, on which electrons are incident are flat and the surfaces514and524from which X-rays are emitted are convex, the present exemplary embodiment is not limited thereto. That is, the surfaces on which electrons are incident may be convex, whereas the surfaces from which X-rays are emitted may be flat.

The thicknesses of anode electrodes530and540gradually increase from the center axis Z of the X-ray generator10toward edges thereof, as illustrated inFIGS. 5C and 5D. When the thicknesses of the anode electrodes530and540increase from the center axis Z of the X-ray generator10toward edges thereof, the X-ray radiated from each of the anode electrodes530and540may propagate toward an area larger than a sectional area of each of the anode electrodes530and540. Thus, the X-ray generator10may radiate an X-ray to a relatively large area of an object.

In more detail, surfaces532and542of the anode electrode530and540, respectively, on which electrons are incident, may be flat surfaces, whereas surfaces534and544from which X-rays are emitted may be concave surfaces. The surfaces534and544from which X-rays are emitted may be concavely curved surfaces or concave surfaces obtained by combining flat surfaces. A size of an area where the X-ray is radiated may be determined by levels, θ and R, of the concave shape. Although inFIGS. 5C and 5Dthe surfaces532and542of the anode electrodes530and540on which electrons are incident are flat and the surfaces534and544from which X-rays are emitted are concave, the present exemplary embodiment is not limited thereto. That is, the surfaces on which electrons are incident may be concave, whereas the surfaces from which X-rays are emitted may be flat.

In addition, as shown inFIG. 5E, both surfaces of an anode electrode550on which electrons are incident and from which X-rays are emitted may be convex. In this case, a focal distance of an X-ray may become shorter. Additionally, both surfaces on which electrons are incident and from which X-rays are emitted may be concave. Alternatively, while one of the surfaces on which electrons are incident and from which X-rays are emitted may be concave, the other surface may be convex.

The thickness of an anode electrode may be partially irregular. For example, as it is illustrated inFIGS. 5F and 5G, anode electrodes560and570may have a shape in which only some parts are convex. A convex shape566may be identical to other convex shapes, as shown on the anode electrode560, or a convex shape576may be different from other convex shapes, as shown on the anode electrode570, according to an area. Nevertheless, the thicknesses of the anode electrodes560and570may be symmetrical with respect to the center axis Z of the X-ray generator10. AlthoughFIGS. 5F and 5Gillustrate only a convex shape, the present exemplary embodiment is not limited thereto. The anode electrode may have a concave shape or both a concave shape and a convex shape. Surfaces562and572of the anode electrodes560and570, respectively, on which electrons are incident, may be flat surfaces.

As such, since the propagating path of an X-ray may be controlled by using the anode electrode having an irregular thickness, the X-ray generator10may not only efficiently radiate an X-ray toward the object, but may also decrease the amount of radiation emitted, thereby reducing an amount of an X-ray radiation dose.

The X-ray imaging apparatus100according to the present exemplary embodiment may use an anode electrode having a uniform thickness.FIG. 6illustrates an anode electrode580having a uniform thickness, according to an exemplary embodiment. Referring toFIG. 6, while the anode electrode580having a uniform thickness is used, the propagating path of an X-ray may be controlled by using a separate constituent element such as a collimator (not shown).

In addition, the anode electrode may include a plurality of layers formed of different materials and are capable of radiating X-rays of different wavelengths.FIG. 7illustrates an anode electrode710formed of different materials, according to an exemplary embodiment. As shown inFIG. 7, the anode electrode710may include a plurality of layers711,712,713, and714formed of different materials. The layers711,712,713, and714may be arranged in parallel with respect to an electron emission device. The anode electrode710may radiate X-rays of different wavelengths according to the layers711,712,713, and714with which electrons collide.

An anode electrode radiating X-rays of multiple wavelengths may not necessarily have a uniform thickness as described above.FIGS. 8A and 8Billustrate anode electrodes810and820formed of different materials, according to exemplary embodiments. Each of the anode electrodes810and820may include a plurality of layers formed of different materials and at least one of the layers may have an irregular thickness.

For example, as shown inFIG. 8A, the anode electrode810may include a plurality of layers811,812,813, and814that are formed of different materials. The layers811,812,813, and814have thicknesses that gradually decrease from the center axis Z of the X-ray generator10toward edges thereof. Accordingly, the anode electrode810may focus the radiated X-rays. Since the X-rays having different wavelengths are focused on different areas, a single linear X-ray generator may image many different areas at different depths of the object at one time.

In addition, as shown inFIG. 8B, the anode electrode820may include a plurality of layers821,822, and823that are formed of different materials. The anode electrode820may have a change in the thickness thereof according to the layers821,822, and823. For example, the first layer821may have a thickness that gradually decreases from the center axis Z of the X-ray generator10toward an edge thereof, the second layer822may have a uniform thickness, and the third layer823may have a thickness that gradually increases from the center axis Z of the X-ray generator10toward the edge thereof. Accordingly, the anode electrode820may radiate an X-ray to a larger surrounding area while focusing on an area of interest of the object.

The X-ray generator10according to the present exemplary embodiment may simultaneously or selectively generate X-rays of different wavelengths.FIGS. 9A to 9Cillustrate an X-ray generator generating an X-ray of a short wavelength or simultaneously generating X-rays of a plurality of wavelength bands, according to exemplary embodiments.

Referring toFIG. 9A, a plurality of electron emission devices910, each having an electron emission source912, are arranged and an anode electrode920may be arranged separately from the electron emission devices910. In the anode electrode920, a first layer922and a second layer924that are formed of different materials may be alternately arranged. When the first layer922and the second layer924overlap with each other in an area corresponding to the electron emission source912of one of the electron emission devices910, electrons emitted by the electron emission devices910may collide with the first layer922and second layer924. Accordingly, the anode electrode920may simultaneously radiate a first X-ray X1 and a second X-ray X2.

As shown inFIG. 9B, the anode electrode920makes a translational movement in parallel with the electron emission devices910such that the first layer922of the anode electrode920may be arranged to overlap with the electron emission source912. Then, the electrons emitted by the electron emission devices910collide with the first layer922and thus the first X-ray X1 may be radiated from the anode electrode920.

As shown inFIG. 9C, the anode electrode920makes a translational movement in parallel with the electron emission devices910such that the second layer924of the anode electrode920may be arranged to overlap with the electron emission source912. Then, the electrons emitted by the electron emission devices910collide with the second layer924and thus the second X-ray X2 may be radiated from the anode electrode920.

As such, since the anode electrode920simultaneously radiates a plurality of X-rays or selectively radiates a single X-ray, usability of the X-ray generator10may be improved.

As described above, X-ray sub-generators are arranged in an X-ray generator10. Each of the X-ray sub-generators is separately manufactured as one unit and then the X-ray sub-generators are assembled, thereby forming the X-ray generator. A plurality of electron emission devices and an anode electrode may be integrally manufactured on a single substrate. Alternatively, a plurality of electron emission devices are manufactured on a single substrate and then an anode electrode is assembled, thereby forming a linear X-ray generator. In addition, the linear X-ray generator may be formed by a variety of methods.

Additionally, the X-ray generator may further include a collimator (not shown) for controlling a direction of an X-ray. Accordingly, the amount of X-ray radiation which is emitted may be reduced, and an X-ray may be also more accurately detected.

FIGS. 10A and 10Bschematically illustrate X-ray detector1000aand X-ray detector1000bthat may be used as the X-ray detector20ofFIG. 1. As shown inFIG. 10A, the X-ray detector1000amay be configured as a plurality of X-ray sub-detectors1010arranged in one dimension. Alternatively, as shown inFIG. 10B, the X-ray detector1000bmay be configured as the plurality of X-ray sub-detectors1010arranged in two dimensions.

Each of the X-ray sub-detectors1010is a light-receiving element that receives an X-ray and converts a received X-ray into an electric signal, and may include, for example, a scintillator1011, a photodiode1012, and a storage element1013. The scintillator1011receives an X-ray and outputs photons, in particular visible photons, that is, a visible ray, according to a received X-ray. The photodiode1012receives the photons output from the scintillator1011and converts received photons into electric signals. The storage element1013is electrically connected to the photodiode1012and stores the electric signal output from the photodiode1012. In this regard, the storage element1013may be, for example, a storage capacitor. The electric signal stored in the storage element1013of each of the X-ray sub-detectors1010is applied to a processor (not shown) where the signal is processed into an X-ray image.

The X-ray detectors1000aand1000bmay detect an X-ray by using a photoconductor which directly converts an X-ray into an electric signal.

The X-ray sub-detectors1010may be provided to correspond to the X-ray sub-generators300of an X-ray generator. The X-ray sub-generators300and the X-ray sub-detectors1010may have a one-to-one correspondence. Alternatively, each of the X-ray sub-generators300may correspond to two or more X-ray sub-detectors1010, or two or more X-ray sub-generators300may correspond to one X-ray sub-detector1010.

The X-ray sub-detectors1010may be simultaneously or independently driven to detect an X-ray. Accordingly, an X-ray passing through the entire area of the object may be detected as all of the X-ray sub-detectors1010are driven, or an X-ray passing through a particular area of the object may be detected as some of the X-ray sub-detectors1010are driven. Also, at least one of the X-ray sub-detectors1010may be simultaneously or sequentially driven.

Although the X-ray sub-detectors1010are formed on a single substrate, the present exemplary embodiment is not limited thereto. Each of the X-ray sub-detectors1010is separately manufactured, and the X-ray sub-detectors1010are assembled into the X-ray detectors1000aand1000b. Alternatively, some of the X-ray sub-detectors1010are formed on a single substrate and then assembled together with the other X-ray sub-detectors1010formed on other substrates. For example, X-ray detectors in one dimension are generated on a single substrate and are then arranged, and thus X-ray detectors in two dimensions may be manufactured.

When an X-ray generation area of the X-ray generator and X-ray detection areas of the X-ray detectors1000aand1000bare equal to or larger than a test area of the object, the linear X-ray generator and the X-ray detectors1000aand1000bmay image the object by performing a single operation. The X-ray imaging apparatus100may image the whole object at one time or a partial area of the object. When a partial area of the object is to be imaged, only some of the X-ray sub-generators300of the X-ray generator may operate to generate an X-ray, and only some of the X-ray sub-detectors1010corresponding to the operating X-ray sub-generators300may be synchronized to detect the X-ray.

However, when at least one of the X-ray generation area of the X-ray generator and the X-ray detection areas of the X-ray detectors1000aand1000bis smaller than the test area of the object, at least one of the X-ray generator and the X-ray detectors1000aand1000bmay move to be driven two times or more.

FIGS. 11A and 11Bare diagrams for explaining an X-ray imaging method when an X-ray generation area A is smaller than a test area B of the object200according to an exemplary embodiment. When the X-ray generation area A of an X-ray generator1110is smaller than the test area B, the X-ray generator1110may move along a first panel1132to generate an X-ray, thereby generating the X-ray in the entire test area B of the object200.

For example, referring toFIG. 11A, the X-ray generator1110radiates an X-ray to a first area B1 of the object200. Then, a first detector1122of an X-ray detector1120next to a second panel1134detects an X-ray that was transmitted to the first area B1. Referring toFIG. 11B, the X-ray generator1110horizontally moves along the first panel1132and then radiates an X-ray to a second area B2 of the object200. In this regard, the second area B2 and the first area B1 may not overlap with each other. Thus, an X-ray radiation dose of the object200may be minimized. A second detector1124of the X-ray detector1120corresponding to the first area B1 detects an X-ray of the second area B2. Although the X-ray generation area A of the X-ray generator1110is half of the test area B inFIGS. 11A and 11B, the present exemplary embodiment is not limited thereto. The X-ray generation area A may be 1/n (where n is a natural number equal to or greater than 2) the test area B.

FIGS. 12A and 12Bare diagrams for explaining an X-ray imaging method when an X-ray detection area C is smaller than the test area B of an object according to an exemplary embodiment. When the X-ray detection area C of the X-ray detector1220is smaller than the test area B, the X-ray detector1220may move along a second panel1234to detect an X-ray, thereby detecting the X-ray that is transmitted to the entire test area B of the object200.

For example, referring toFIG. 12A, a first X-ray generator1212of an X-ray generator1210next to first panel1232generates X-rays to be transmitted to the first area B1 of the object200. Then, an X-ray detector1220detects an X-ray of the first area B1. Referring toFIG. 12B, the X-ray detector1220horizontally moves along the second panel1234. Then, a second X-ray generator1214of the X-ray generator1210emits X-rays to be transmitted to the second area B2 of the object200. The X-ray detector1220detects an X-ray of the second area B2. In this regard, the second area B2 and the first area B1 may not be overlapping with each other. Thus, an amount of X-ray radiation transmitted to the object200may be minimized. Although the X-ray detection area C of the X-ray detector1120is half of the test area B inFIGS. 12A and 12B, the present exemplary embodiment is not limited thereto. The X-ray detection area C may be 1/n (where n is a natural number equal to or greater than 2) the test area B.

In addition, when the X-ray generation area A and the X-ray detection area C are smaller than the test area B and correspond to each other one-to-one, the X-ray generators1110and1210and the X-ray detectors1120and1220may be synchronized to image a part of a region of the test area B. The X-ray generator1110may horizontally move along first panel1132and the X-ray detector1120may move along second panel1134in order to image other areas of the test area B. Also, the X-ray generator1210may horizontally move along first panel1232and the X-ray detector1220may move along the second panel1234in order to image other areas of the test area B.

When the X-ray generation area A and the X-ray detection area C are smaller than the test area B, and the X-ray generation area A is smaller than the X-ray detection area C, the X-ray imaging method ofFIGS. 12A and 12Bmay be applied to image a partial region of the test area B. Each of the X-ray generators1110and1210and the X-ray detectors1120and1220may horizontally move along the first and second panels1132and1134and the first and second panels1232and1234, respectively, and image other regions of the test area B. Furthermore, when the X-ray generation area A and the X-ray detection area C are smaller than the test area B, and the X-ray detection area C is smaller than the X-ray generation area A, the X-ray imaging method ofFIGS. 12A and 12Bmay be applied to image a partial region of the test area B.

Meanwhile, the X-ray imaging apparatus100according to an exemplary embodiment may acquire a tomography image of the object200. To acquire the tomography image, the X-ray generators may radiate an X-ray toward the object by varying a radiation angle of the X-ray toward the object. The X-ray generators according to an exemplary embodiment may vary the radiation angle to the object by moving horizontally with respect to the object. In this regard, horizontal movement means horizontal movement of the center axes of the X-ray generators.

To acquire the tomography image, the X-ray generators may radiate an X-ray to the object at multiple locations. When the X-ray is radiated at multiple locations, the center axes of the X-ray generators may move in parallel with the object. Furthermore, the X-ray generators may radiate an X-ray by varying a radiation angle according to locations of the X-ray generators. For example, the X-ray generators may radiate an X-ray to the object vertically at a first location and then radiate an X-ray at an incline at a second location. In this regard, the X-ray detectors may be located under the object. The X-ray detectors may be in a fixed position.

FIGS. 13A through 13Care diagrams for explaining an X-ray imaging method so as to acquire a tomography image according to an exemplary embodiment. Referring toFIG. 13A, when an X-ray generator1310is located on a left upper portion of the object200, the X-ray generator1310may rotate with respect to a center axis P1 thereof such that an X-ray radiation direction is changed from the left upper portion to a right lower portion. The X-ray generator1310located above the panel1332radiates an X-ray at a first radiation angle θ1 toward the object200, and thus an X-ray imaging apparatus may image a first image of the object200.

The X-ray generator1310can be moved to the right. When the X-ray generator1310moves, the center axis P1 of the X-ray generator1310may move in parallel with the object200. When the X-ray generator1310is located on the object200, the X-ray generator1310may adjust its posture to allow an X-ray to face the object200. For example, the X-ray generator1310may rotate in a clockwise direction with respect to the center axis P1 of the X-ray generator1310. As shown inFIG. 13B, the X-ray generator1310may be located in parallel with the object200. The X-ray generator1310may vertically radiate an X-ray to the object200. The X-ray imaging apparatus may also image a second image of the object200. As shown inFIGS. 13A and 13B, an X-ray detector1320located next to panel1334detects the X-rays.

The X-ray generator1310may move in parallel with the object200, for example, towards the right side of the object, until the X-ray generator1310is located on a right upper portion of the object200. When the X-ray generator1310is located on the right upper portion of the object200, the X-ray generator1310may adjust its posture to allow an X-ray generated by the X-ray generator1310to be radiated at an incline to the object200. For example, as shown inFIG. 13C, the X-ray generator1310may rotate in a clockwise direction with respect to the center axis P1 of the X-ray generator1310. The X-ray generator1310may radiate an X-ray at a second radiation angle θ2 toward the object200, and thus the X-ray imaging apparatus may image a third image of the object200.

When the X-ray generator1310moves in a horizontal direction with respect to an X-ray detector1320, the X-ray generator1310rotates with respect to the center axis P1 thereof according to a location. The order of movement, such as an order of horizontal movement and rotational movement, may be switched. Also, the second image of the object200may be imaged in advance and a first image or a third image may be obtained.

The X-ray detector1320may detect an X-ray by moving so as to correspond to the X-ray generator1310.FIGS. 14A through 14Care diagrams for explaining an X-ray imaging method so as to acquire a tomography image according to another exemplary embodiment.

Referring toFIG. 14A, when the X-ray generator1310is located on a left upper portion of the object200, the X-ray generator1310may rotate with respect to the center axis P1 thereof such that an X-ray may be radiated at an incline to the object200. In this regard, the X-ray detector1320may also move to face the X-ray generator1310. For example, the X-ray detector1320may move to be located on a right lower portion of the object200and rotate with respect to a center axis P2 of the X-ray detector1320such that the X-ray generator1310and the X-ray detector1320may be located in parallel with each other. The X-ray generator1310may radiate an X-ray at a first radiation angle θ3 to the object200. Thus, an X-ray imaging apparatus may obtain a first image of the object200.

Referring toFIG. 14B, the X-ray generator1310may move so as to be located on the object200. Furthermore, the X-ray generator1310may adjust its posture such that the X-ray generator1310may be located in parallel with the object200. In this regard, the X-ray detector1320may also move. For example, the X-ray detector1320may move to be located under the object200and rotate with respect to the center axis P2 thereof such that the X-ray generator1310, the object200, and the X-ray detector1320may be located in parallel with each other. The X-ray generator1310may vertically radiate an X-ray toward the object200, and thus the X-ray imaging apparatus may acquire a second image of the object200.

Referring toFIG. 14C, the X-ray generator1310may move toward a right upper portion of the object200and adjust its posture such that an X-ray is radiated at an incline toward the object200. In this regard, the X-ray detector1320may also move to be located in parallel to the X-ray generator1310. For example, the X-ray detector1320may move to be located on a left lower portion of the object200and rotate with respect to the center axis P2 thereof such that the X-ray generator1310, the object,200, and the X-ray detector1320may be located in parallel to each other. The X-ray generator1310may radiate an X-ray at a second radiation angle θ4 to the object200, and thus the X-ray imaging apparatus may acquire a third image of the object200.

As described above, the X-ray generator1310may move to vary a radiation angle of an X-ray and radiate the X-ray to the object200, thereby simplifying an imaging process for acquiring a tomography image.

Furthermore, in the exemplary embodiment, the X-ray generator1310and the X-ray detector1320can be fixed or the X-ray generator1310and the X-ray detector1320can rotate to acquire the tomography image.

FIG. 15is a schematic diagram of an X-ray generator1510according to an exemplary embodiment. Referring toFIG. 15, the X-ray generator1510according to an exemplary embodiment may include a plurality of X-ray sub-generators1511arranged in one dimension and a rotator1513that supports and rotates the X-ray sub-generators1511. The X-ray generator1510may include a driver (not shown) that drives the rotator1513. If the rotator1513rotates at a predetermined time interval, the X-ray sub-generators1511located on the rotator1513may radiate an X-ray to an object at different radiation angles at the predetermined time interval. An X-ray detector may include a rotator like the X-ray generator1510.

FIGS. 16A through 16Care diagrams for explaining an X-ray imaging method so as to acquire a tomography image according to another exemplary embodiment.

Referring toFIG. 16A, a rotator1613may rotate such that each X-ray sub-generator1611of an X-ray generator1610may radiate an X-ray to the object200at the first radiation angle θ3 at a first time. For example, the rotator1613may rotate in a counterclockwise direction when imagining is being performed a first time. The X-ray generator1610may radiate the X-ray to the object200at the first radiation angle θ3, and thus an X-ray imaging apparatus may acquire a first image of the object200.FIGS. 16A, 16B and 16Calso illustrates a first panel1632, a second panel1634and an X-ray detector1620.

Referring toFIG. 16B, each X-ray sub-generator1611rotates in a counterclockwise direction at a second time after a predetermined time elapses and then the X-ray generator1610may vertically radiate an X-ray to the object200. The X-ray imaging apparatus may acquire a second image of the object200. Furthermore, referring toFIG. 16C, each of the X-ray sub-generators1611rotates in a clockwise direction at a third time after a predetermined time elapses and then the X-ray generator1610may vertically radiate an X-ray to the object200at the second radiation angle θ4. The X-ray imaging apparatus may then acquire a third image of the object200. In this regard, X-ray sub-detectors1621may rotate like the X-ray sub-generators1611to detect an X-ray.

As described above, an X-ray radiation angle may be changed by rotating only the X-ray sub-generators1611, thereby simplifying an imaging process for acquiring the tomography image.

Furthermore, a shape of an anode electrode among the X-ray sub-generators1611may be used to change the X-ray radiation angle with respect to the object200.FIG. 17is a schematic diagram of an X-ray generator1710used to acquire a tomography image according to an exemplary embodiment. Referring toFIG. 17, the X-ray generator1710may include an anode electrode1712that emits an X-ray due to collisions between electrons emitted by a plurality of electron emission devices1711that are independently driven. The anode electrode1712may have a different thickness with respect to a center axis P3 of the X-ray generator1710. For example, if the anode electrode1712is divided into three regions, a thickness of the first region1712aincreases as the first region1712ais closer to the center axis P3 of the X-ray generator1710, a thickness of a second region1712bis uniform, and a thickness of a third region1712cdecreases as the third region1712cis farther away from the center axis P3 of the X-ray generator1710. Thus, an X-ray from the first region1712ais radiated to the object200at the first radiation angle θ3, an X-ray from the second region1712bmay be vertically radiated to the object200, and an X-ray from the third region1712cmay be radiated to the object200at the second radiation angle θ4.

If the electron emission device1711corresponding to the first region1712aemits electrons at a first time, the X-ray generated in the first region1712amay be radiated to the object200at the first radiation angle θ3. If the electron emission device1711corresponding to the second region1712bemits electrons at a second time, the X-ray generated in the second region1712bmay be vertically radiated to the object200. If the electron emission device1711corresponding to the third region1712cemits electrons at a third time, the X-ray may be generated in the third region1712c. The X-ray generated in the third region1712cmay be radiated to the object200at the second radiation angle θ4. Thus, an X-ray imaging apparatus may perform X-ray imaging to acquire the tomography image by using a shape of the anode electrode1712.

The X-ray imaging to acquire the tomography image is performed three times. However, this is for convenience of description, and X-ray imaging may be performed two or more times to acquire the tomography image.

The X-ray imaging apparatus according to the present exemplary embodiment may further include a sensor that senses the object200. The sensor may include a plurality of sensors. Each sensor may sense an existence of the object200and determine a location of the object200based on results of sensing by all the sensors. The sensors may be light sensors, such as, illumination sensors, touch sensors, etc. In particular, when the sensors are touch sensors, the sensors may be formed as a single pad, i.e., a touch pad.

FIGS. 18A and 18Bare schematic diagrams of X-ray generators1810aand1810bincluding a plurality of sensors1871according to an exemplary embodiment. The sensors1871may be arranged to be integrated with the X-ray generators1810aand1810b. Referring toFIG. 18A, a one dimensional sensor array1870is located at a side of the one dimensional X-ray generator1810aso that the one dimensional X-ray generator1810aand the one dimensional sensor array1870may be integrated. Alternatively, referring toFIG. 18B, the sensor1871may be located to be spaced apart from each other on a second dimensional X-ray generator1810b. The sensors1871may be located so as not to overlap with X-ray sub-generators1811. InFIG. 18B, the sensors1871are located on regions in which four X-ray sub-generators1811are adjacent. In particular, the sensors1871may be located on the same plane of the X-ray generators1810aand1810bas an anode electrode (not shown). Thus, the path of an emitted X-ray will not be influenced by the sensors1871. However, the present exemplary embodiment is not limited thereto. Locations of the sensors1871can vary so long as the X-ray traveling path and the sensors1871do not overlap with each other.

Although the sensors1871are located throughout the entire region in which the X-ray generators1810aand1810bare located, the present exemplary embodiment is not limited thereto. When a size and location of an object is known, the sensors1871may not be located in a region in a region in which there is no possibility that the object is to be located. The sensors1871may be focused in a region corresponding to a boundary of the object. The sensors1871located on the X-ray generators1810aand1810bmay be light sensors.

Although the sensors1871are integrally formed with the X-ray generators1810aand1810binFIGS. 18A and 18B, the present exemplary embodiment is not limited thereto. The sensors1871may be integrally formed with X-ray detectors. For example, when X-ray detectors are one dimensional X-ray detectors, the sensors1871may be located to contact the X-ray detectors. When the X-ray detectors are second dimensional X-ray detectors, the sensors1871may be located between the X-ray detectors.

FIGS. 19A and 19Billustrate a panel1932on which sensors1971are located according to an exemplary embodiment. Referring toFIG. 19A, the sensors1971may be located on the panel1932. If the sensors1971are located on an X-ray generator, when the X-ray generator does not cover an object, the X-ray generator needs to be moved in a horizontal direction to detect a location of the object. However, since the panel1932covers the object, when the sensors1971are located on the panel1932, the object may be more easily detected. The sensors1971may be located on a surface of the panel1932facing the X-ray generator or on a surface of the panel1932facing the object. The sensors1971located on the panel1932may be light sensors, touch sensors, etc. When the sensors1971are located on the panel1932, the sensors1971may be formed of a transparent material so as to minimize the diffusion of an X-ray or to minimize absorption by the sensors1971. In particular, when the sensors1971are touch sensors, the sensors1971may be implemented as a touch pad1980.

FIG. 20is a block diagram of the X-ray imaging apparatus100ofFIG. 1according to an exemplary embodiment. Referring toFIG. 20, the X-ray imaging apparatus100may include an X-ray generator10, an X-ray detector20, the user input device52, a display54, a processor56, and a controller60. The X-ray imaging apparatus100may further include a sensor70that senses an object.

The X-ray generator10radiates an appropriate X-ray to the object as described above. The X-ray generator10is described above, and thus a description thereof will not be repeated here. The X-ray detector20detects the X-ray that transmitted the object. When the X-ray generator10radiates the X-ray, the X-ray detector20detects the X-ray that transmitted to the object, which is described above, and thus a description thereof will not be repeated here.

The user input device52receives an input of an X-ray imaging command from a user, such as a medical expert. Information regarding a command to change a location of the X-ray generator10, a parameter adjustment command to vary an X-ray spectrum, a command regarding a main body of the X-ray imaging apparatus100or a movement of the X-ray generator10, and all commands received from the user is transmitted to the controller60. The controller60controls elements included in the X-ray imaging apparatus100according to a user command.

The processor56receives an electrical signal corresponding to the X-ray detected by the X-ray detector20. The processor56may preprocess the electrical signal to acquire an image. In this regard, preprocessing may include at least one of offset compensation, algebra conversion, X-ray dose compensation, sensitivity compensation, and beam hardening. The image includes a tomography image.

The processor56may preprocess the electrical signal corresponding to the detected X-ray to acquire the image. The processor56may preprocess an electrical signal corresponding to the detected X-ray to acquire transparent data and reconfigure the acquired transparent data for each radiation angle to acquire the tomography image.

A location and a type of the sensor70are described above, and thus a detailed description thereof will not be repeated here. Each sensor included in the sensor70may sense an existence of the object and apply a result of the sensing to the controller60. Thus, the controller60may determine a location of the object by using results of the sensing by the sensors. The controller60may control the X-ray generator10to allow an X-ray sub-generator of the X-ray generator10corresponding to the location of the object to generate an X-ray. Furthermore, the controller60may control the X-ray detector20to allow an X-ray sub-detector of the X-ray detector20corresponding to the location of the object to detect an X-ray that is transmitted to the object.

In an exemplary embodiment, only some of the X-ray sub-generators operate to image the object, thereby reducing an X-ray radiation dose. Furthermore, only some of the X-ray sub-detectors operate, and thus a lifetime of the X-ray detector20may be increased, thereby simplifying signal processing.

An X-ray imaging method using the sensor70will now be described.FIG. 21is a flowchart of an X-ray imaging method according to an exemplary embodiment. Referring toFIG. 21, the sensor70senses the object200(operation S2110). If the object200is located between the first panel32and the second panel34of the X-ray imaging apparatus100ofFIG. 1, the X-ray imaging apparatus100may move at least one of the first panel32and the second panel34according to a user command to compress the object200. If the object200contacts the first panel32and the second panel34or is pressed by the first panel32and the second panel34, each sensor included in the sensor70may sense an existence of the object200. For example, when sensors are illumination sensors, the sensors may sense whether the object200exists based on an illumination change, and when the sensors are touch sensors, the sensors may sense whether the object200exists according to whether the touch sensors are touched. A result of the sensing by each sensor is applied to the controller60.

The controller60may control the X-ray generator10to allow an X-ray sub-generator of the X-ray generator10corresponding to a location of the object200to generate an X-ray by using results of the sensing by the sensor70(operation S2120). The controller60may determine the location of the object200from the result of the sensing by each sensor. For example, the location of the object200may be determined from locations of the sensors that detect the illumination change and whether the sensors are touched. The location of the object200may be determined to be slightly greater than locations of the sensors. The controller60may control the X-ray sub-generator of the X-ray generator10corresponding to the location of the object200to generate the X-ray. An X-ray generation method may vary according to sizes of an X-ray test area and an X-ray generation area, and according to whether an image that is to be imaged is a simple image or a tomography image.

The controller60may control the X-ray detector20to allow an X-ray sub-detector of the X-ray detector20corresponding to the location of the object to detect the X-ray (operation S2130). An X-ray detection method may vary according to sizes of the X-ray test area and the X-ray generation area, and according to whether the image that is to be imaged is the simple image or the tomography image. This is described above, and thus a detailed description thereof will not be repeated here. If only the X-ray sub-detector of the X-ray detector20corresponding to the location of the object detects the X-ray, the X-ray diffused by being transmitted to the object200is detected, thereby blocking noise.

Then, the processor56may receive an electrical signal corresponding to the X-ray detected by the X-ray sub-detector to acquire an image (operation S2140). The acquired image may be displayed on the display54.

Although the sensor70senses the object200, and the X-ray imaging apparatus100operates according to a result of the sensing, the present exemplary embodiment is not limited thereto. When the sensor70is not included in the X-ray imaging apparatus100, the X-ray imaging apparatus100may perform imaging as described with reference toFIGS. 11A through 15C.