Abstract:
A medical image diagnosis apparatus, comprises an image generator, a display, and a mechanism. The image generator is configured to generate a medical image. The display comprises a plurality of monitors and is configured to display the medical image. The mechanism is configured to change an arrangement of the plurality of monitors with respect to each of the monitors.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This continuation application is based upon, and claims the benefit of priority from prior U.S. patent application Ser. No. 10/347,921, filed on Jan. 22, 2003 which claims the benefit of priority from prior Japanese Patent Application No. 2002-013262, filed January 22, 2002. The entire contents of the above-identified applications are incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION  
       [0002]     The present invention relates to a medical image diagnosis apparatus and a display for a use in a medical image diagnosis apparatus, with a plurality of monitors to display medical images. The present invention further relates to a method of arranging such a plurality of monitors.  
       BACKGROUND OF THE INVENTION  
       [0003]     Various kinds of medical diagnoses have been realized nowadays by interpreting medical images obtained from medical diagnosis apparatuses, such as, for example, an X-ray diagnosis apparatus, an X-ray CT (computer tomography) apparatus, an MRI (magnetic resonance imaging) apparatus, a nuclear medical diagnosis apparatus, an ultrasound diagnosis apparatus, and an endoscopic image apparatus. In the event that medical images are obtained from such medical diagnosis apparatuses, the obtained images are usually displayed in one or more monitors provided in the vicinity of the medical diagnosis apparatuses. This is, for example, for the purpose of checking the obtained images and seeing whether the images are correctly obtained or it is necessary to acquire substitute image at the same position again. Further, the obtained images are sometimes used for the image interpretation immediately right at the place in case of emergency, for example.  
         [0004]      FIG. 1  is a diagram showing a configuration of an X-ray diagnosis apparatus with a display according to a prior art. The X-ray diagnosis apparatus shown in  FIG. 1  is a so-called bi-plane apparatus which allows obtaining images from two directions at the same time. The X-ray diagnosis apparatus includes a first imaging system comprising a first X-ray tube  1   a , a first detector  2   a , and a first holder  3 . The X-ray diagnosis apparatus also includes a second imaging system comprising a second X-ray tube  1   b , a second detector  2   b , and a second holder  4 . Additionally, the apparatus includes a bed table  5 , a bed  6 , a display  7 , a display holder  7   a , a display panel  8 , an operation unit  9 , a first rail  10   a , and a second rail  10   b .  
         [0005]     The first imaging system is for obtaining X-ray images from a first direction. The first X-ray tube  1   a  generates (or radiates) an X-ray which is exposed to a patient to be examined from the first direction. The X-ray exposed to the patient is transmitted through the patient. The detector  2   a  detects the transmitted X-ray. The first holder  3  holds the first X-ray tube  1   a  and the first detector  2   a  by means of an arm connecting the first X-ray tube  1   a  and the first detector  2   a . The first holder  3  further drives or moves a set of the first X-ray tube  1   a  and the first detector  2   a  in three-dimensional directions.  
         [0006]     The second imaging system is for obtaining X-ray images from a second direction. The second X-ray tube  1   b  generates (or radiates) an X-ray which is exposed to the patient to be examined from the second direction. The X-ray exposed to the patient is transmitted through the patient. The detector  2   b  detects the transmitted X-ray. The second holder  4  holds the second X-ray tube  1   b  and the second detector  2   b  by means of an arm connecting the second X-ray tube  1   b  and the second detector  2   b . The second holder  4  further drives or moves a set of the second X-ray tube  1   b  and the second detector  2   b  in three-dimensional directions.  
         [0007]     The patient lies on the bed table  5  The bed  6  has a driving unit which drives and moves the bed table  5  vertically or horizontally. The display  7  comprises a plurality of monitors. In  FIG. 1 , the display  7  has four monitors. There are two monitors in the horizontal direction and also two monitors ill the vertical direction Each monitor can be used to display X-ray images obtained in the X-ray diagnosis apparatus. The display  7  is held by the display holder  7   a . The display panel  8  displays several information related to imaging conditions of the X-ray diagnosis apparatus.  
         [0008]     The operation unit  9  is used for determining a position of the bed table  5  by providing designation signals to operate the bed  6 . The first rail  10   a  is used for running the second holder  4 . The second rail  10   b  is used for running the display holder  7   a .  
         [0009]     Conventional monitors used for the display  7  are known to include CRT (cathode ray tube) monitors. Therefore, they occupy a wide space in the vicinity of the X-ray diagnosis apparatus. The display  7  can be moved along the second rail  10   b . However, an examination room where the X-ray diagnosis apparatus is usually placed is not so spacious to move away the display  7 . Keeping the display  7  around the bed table  5  limits an area where a radiological technologist moves around the patient. Further, it was also a big annoyance to a doctor when the doctor must examine the patient with, for example, a catheter.  
         [0010]     Under such a circumstance, an image display monitor is being improved and newly developed with a LCD (crystal liquid display). An LCD monitor is much thinner and lighter than the CRT display monitor. Accordingly, the conventional CRT display monitors are challenged to be replaced with the LCD monitors. Such replacement can be very helpful to apply to the above-explained case. The replacement may be a solution to the prior art problem and may allow giving the radiological technologist and the doctor much more space  
         [0011]     As shown in  FIG. 1 , however, the display  7  has four monitors Even if they are replaced with LCD monitors, it is a fact that this number of monitors still occupies a certain space. In practice, these monitors are moved around the bed table  5  in accordance with the manipulation of the doctor, for example. The doctor usually checks an ongoing manipulation status in the monitors. As he changes his position around the bed table  5  (i.e. around the patient) in accordance with his manipulation, the display  7  (or the monitors) must be changed its position so as to allow the doctor to observe images displayed in the display  7 .  
         [0012]     Such position changes are sometimes performed across and over the patient The doctor or his aids must be very careful about moving the display  7  over the patient, but, as a matter of fact, it was not easy to do so due to a size of the display comprising four monitors. Particularly, when there are a plurality of monitors in the vertical direction, it is obviously more difficult. The plurality of monitors in the vertical direction may also be a problem when a person, such as the radiological technologist, the doctor, and the aides, are tall enough to bump his or her head against the display. It disturbs their concentration on their work.  
       BRIEF SUMMARY OF THE INVENTION  
       [0013]     According to a first aspect of the present invention, there is provided a medical image diagnosis apparatus, which comprises an image generator configured to generate a medical image, a display, comprising a plurality of monitors, configured to display the medical image, and a mechanism configured to change an arrangement of the plurality of monitors with respect to each of the monitors.  
         [0014]     According to a second aspect of the present invention, there is provided a display apparatus for a use in a medical image diagnosis apparatus that generates a medical image. The apparatus comprises a plurality of monitors configured to display the medical image, and a mechanism configured to change an arrangement of the plurality of monitors with respect to each of the monitors.  
         [0015]     According to a third aspect of the present invention, there is provided a method of arranging a plurality of monitors which display a medical image in a medical image diagnosis apparatus. The method comprises steps of detecting an operation mode of the medical image diagnosis apparatus, and automatically placing at least one of the plurality of monitors, which is not used in the operation mode detected in the detecting step, behind at least one other of the monitors 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]     A more complete appreciation of embodiments of the present invention and many of its attendant advantages will be readily obtained by reference to the following detailed description considered in connection with the accompanying drawings, in which:  
         [0017]      FIG. 1  is a diagram showing a configuration of an X-ray apparatus with a display according to the prior art;  
         [0018]      FIG. 2  is a diagram showing a configuration of an X-ray diagnosis apparatus with a display in a bi-plane mode according to an embodiment of the present invention;  
         [0019]      FIG. 3  is a diagram showing another configuration of an X-ray diagnosis apparatus with a display in a single-plane mode according to an embodiment of the present invention;  
         [0020]      FIG. 4  is a diagram showing a configuration of a display according to an embodiment of the present invention;  
         [0021]      FIG. 5  is a diagram showing another configuration of the display according to an embodiment of the present invention;  
         [0022]      FIG. 6  is a diagram showing a side aspect of the display and its peripherals with monitors placed at an original position according to an embodiment of the present invention;  
         [0023]      FIG. 7  is a diagram showing a side aspect of the display and its peripherals with the monitors placed at a folded position according to an embodiment of the present;  
         [0024]      FIG. 8  is a diagram showing side aspects of the display when the upper monitor frame  27   c  is folded according to an embodiment of the present invention;  
         [0025]      FIG. 9 a  diagram showing another side aspect of the display and its peripherals with the monitors placed at an original position according to an embodiment of the present invention;  
         [0026]      FIG. 10  is a diagram showing a side aspect of the display  27  and its peripherals with the monitors placed at a slid position according to an embodiment of the present invention;  
         [0027]      FIG. 11  is a diagram showing side aspects of the display  27  when the upper monitor frame  27   c  slides according to an embodiment of the present invention;  
         [0028]      FIG. 12  is a diagram showing an alternative example of the sliding according to an embodiment of the present invention;  
         [0029]      FIG. 13  is a diagram showing a first arrangement viewed from a front aspect of a display according to an embodiment of the present invention;  
         [0030]      FIG. 14  is a diagram showing a second arrangement viewed from the front aspect of the display according to an embodiment of the present invention;  
         [0031]      FIG. 15  is a diagram showing a third arrangement viewed from the front aspect of the display according to an embodiment of an present invention;  
         [0032]      FIG. 16  is a diagram showing a fourth arrangement viewed from the front aspect of the display according to an embodiment of the present invention;  
         [0033]      FIG. 17  is a diagram showing a fifth arrangement viewed from the front aspect of the display according to an embodiment of the present invention;  
         [0034]      FIG. 18  is a diagram showing a sixth arrangement viewed from the front aspect of the display according to an embodiment of the present invention;  
         [0035]      FIG. 19  is a diagram showing a seventh arrangement viewed from the front aspect of the display according to an embodiment of the present invention;  
         [0036]      FIG. 20  is a diagram showing a eighth arrangement viewed from the front aspect of the display according to an embodiment of the present invention; and  
         [0037]      FIG. 21  is a diagram showing still another configuration of an X-ray diagnosis apparatus with a display according to an embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0038]     Embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments of the present invention will be explained with an X-ray diagnosis apparatus as an example of a medical image diagnosis apparatus.  
         [0039]      FIG. 2  is a diagram showing a configuration of an X-ray diagnosis apparatus with a display according to an embodiment of the present invention. The X-ray diagnosis apparatus shown in  FIG. 2  is a so-called bi-plane apparatus which allows obtaining images from two directions at the same time. The X-ray diagnosis apparatus includes a first imaging system comprising a first X-ray tube  21   a , a first detector  22   a , and a first holder  23 . The X-ray diagnosis apparatus also includes a second imaging system comprising a second X-ray tube  21   b , a second detector  22   b , and a second holder  24 . The X-ray diagnosis apparatus further includes a bed table  25 , a bed  26 , a display  27 , a display holder  27   a , a display panel  28 , an operation unit  29 , a first rail  30   a , a second rail  30   b , a rail sensor  31 , a monitor link mechanism  32 , a position sensor  33 , a controller  34 , a link mechanism driver  35 , and a display supporter driver  36 .  
         [0040]     The first imaging system is for obtaining X-ray images from a first direction, such as, for example, a direction from the front to the back of the patient. The first X-ray tube  21   a  generates (or radiates) an X-ray which is exposed to the patient to be examined from the first direction. The X-ray exposed to the patient is transmitted through the patient. The detector  22   a  detects the transmitted X-ray. The first holder  23  is fixed on the floor and holds the first X-ray tube  2   1   a  and the first detector  22   a  by means of an arm connecting the first X-ray tube  21   a  and the first detector  22   a . The first holder  23  further drives or moves a set of the first X-ray tube  21   a  and the first detector  22   a  in three-dimensional directions.  
         [0041]     The second imaging system is for obtaining X-ray images from a second direction, such as, for example, a direction from the right to the left of the patient. The second X-ray tube  21   b  generates (or radiates) an X-ray which is exposed to the patient to be examined from the second direction. The X-ray exposed to the patient is transmitted through the patient. The detector  22   b  detects the transmitted X-ray, The second holder  24  is hung from the ceiling and moves along the first rail  30   a . The second holder  24  holds the second X-ray tube  21   b  and the second detector  22   b  by means of an arm connecting the second X-ray tube  21   b  and the second detector  22   b . Further, the second holder  24  also drives or moves a set of the second X-ray tube  21   b  and the second detector  22   b  in three-dimensional directions. The movement of the second holder  24  along the first rail  30   a  may be sensed by the rail sensor  31 , such as a microswitch, at a predetermined position of the first rail  30   a  so that it can be determined whether the second imaging system is in a position for its use.  
         [0042]     The patient lies on the bed table  25 . The bed  26  has a driving unit which drives and moves the bed table  25  vertically or horizontally. The display  27  comprises a plurality of monitors.  
         [0043]     In  FIG. 2 , the display  27  has four monitors. Each of the monitors may be an LCD monitor. There are two monitors in the horizontal direction and also two monitors in the vertical direction. For example, two of the monitors may be used for the first imaging system. One of the two monitors may be used for displaying an original image obtained in the first imaging system, and the other one may be used for displaying a processed image resulting from processing the original image or others. These two monitors may be laid in a lower stand of the display  27 . Another two of the monitors may be used for the second imaging system. One of these monitors may be used for displaying an original image obtained in the second imaging system, and the other one may be used for displaying a processed image resulting from processing the original image or others. These other two monitors may be laid in a upper stand of the display  27 .  
         [0044]     The two monitors in the lower stand and the two monitors in the upper stand may be linked to each other by the monitor link mechanism  32 . The link mechanism driver  35  drives the monitor link mechanism  32  so as to move the position of the monitors relative to each other. The position sensor  33  may sense a status of the monitor link mechanism  32 . The details of the link mechanism driver  35  and the position sensor  33  will be explained later. The display  27  is held in a rotatable manner by the display holder  27   a  and so hung from the ceiling. The display holder  27   a  moves along the second rail  30   b . The display  27  is also changed its height from the floor by the display supporter driver  36 . The display supporter driver  36  may control to adjust the height of the display  27  to a height appropriate for the doctor or the like to observe images displayed in the display  27 .  
         [0045]     The display panel  28  displays several information related to imaging conditions of the X-ray diagnosis apparatus, such as positions of the first holder  23 , the second holder  24 , and the bed table  25  and X-ray quantities radiating from the first X-ray tube  21   a  and from the second X-ray tube  21   b .  
         [0046]     The operation unit  29  is used for determining a position of the bed table  25  by providing designation signals to operate the bed  26 . Further, the operation unit  29  may also be used for adjusting a position of the first holder  23 , a position of the second holder  24 , a position of the set of the first X-ray tube  2 la and the first detector  22   a , and a position of the set of the second X-ray tube  2   1   b  and the second detector  22   b .  
         [0047]     The controller  34  controls each component or unit of the X-ray diagnosis apparatus, which has been described above.  
         [0048]     The X-ray diagnosis apparatus with a bi-plane feature may usually be used for, for example, an X-ray fluoroscopy with a contrast agent in an examination of a left ventriculography or a cardiac examination for an infant. Since the bi-plane examination makes it possible to obtain images from two different directions at the same time, it can reduce an amount of the enhancement agent to be used for a patient.  
         [0049]     When the X-ray diagnosis apparatus is operated in a bi-plane mode, two monitors in a lower stand may be used to display images obtained in the first imaging system and two monitors in an upper stand may be used to display images obtained in the second imaging system, as mentioned above. When, however, the X-ray diagnosis apparatus is used in a single-plane mode, that is to say, when, for example, only the first imaging system is used to obtain images, it may not be necessary to use all the four monitors in the display  27 .  
         [0050]      FIG. 3  is a diagram showing another configuration of an X-ray diagnosis apparatus with a display in the single-plane mode according to an embodiment of the present invention. As shown in  FIG. 3 , the second imaging system comprising the second X-ray tube  21   b , the second detector  22   b , and the second holder  24  may be slid back away from the bed table  25  when the X-ray diagnosis apparatus is operated in the single-plane mode. This makes it easier to perform an examination since it provides more space around the bed table  25 . The doctor and the radiological technologist are given more space to move around the bed table  25 . Further, the display  27  is made compact since an examination in the single-plane mode does not require all the four monitors to display images. Here is an example that only two monitors are required in the single-plane mode. In the display  27 , monitors in the upper stand have been moved behind the monitors in the lower stand. This can be accomplished by sliding one monitor behind or in front of another monitor. Likewise, such a re-arrangement can be accomplished by folding one monitor behind or in front of another monitor. In such a circumstance, the doctor or the radiological technologist is given still further more space to move around the bed table  25 . This example of the display  27  will be explained with reference to  FIGS. 4 and 5 .  
         [0051]      FIG. 4  is a diagram showing a configuration of the display  27  according to an embodiment of the present invention. The display  27  is connected to the display holder  27   a  via a supporter  27   d . The display  27  has a lower monitor frame  27   b  and an upper monitor frame  27   c . The lower monitor frame  27   b  fixes a first monitor  270   a  and a second monitor  270   b . The display panel  28  may also he fixed in the lower monitor frame  27   b . The upper monitor frame  27   c  fixes a third monitor  270   c  and a fourth monitor  270   d . The monitor link mechanism  32  comprises a straight arm  32   a  in a form similar to a letter ‘I’, an L arm  32   b  in a form similar to a letter ‘L’, and an arm driver  32   c . The arm driver  32   c  may be, for example, an air cylinder, a hydraulic cylinder, or an electric power cylinder, so as to be controlled its length An arm driving unit  27   e  provided in the display holder  27   a  drives the arm driver  32   c . The arm driving unit  27   e  may be, for example, an air compressor, a hydraulic pump, or a power source, and be connected to the arm driver  32   c  via an air tube, a hydraulic hose, or a power cord. The arm driving unit  27   e  may be controlled by the link mechanism driver  35 .  
         [0052]     As explained above, for example, when the X-ray diagnosis apparatus is operated in the single-plane mode, the second imaging system is slid away from the bed table  25  to the backward. Such movement of the second imaging system is sensed by the rail sensor  31  and is reported to the controller  34  Responsive to the report from the rail sensor  31 , the controller  34  controls the link mechanism driver  35  so that the link mechanism driver  35  controls the arm driving unit  27   e . The arm driving unit  27   e  drives the arm driver  32   c  to change its length In accordance with the length of the arm driver  32   c , the straight arm  32   a  and the L arm  32   b  are moved correspondingly. Accordingly, the upper monitor frame  27   c  is moved and placed behind the lower monitor frame  27   b  as shown in  FIG. 5 .  
         [0053]     When the upper monitor frame  27   c  is placed behind the lower monitor frame  27   b , the position sensor  33  senses an expanded position or a screw position of the arm driver  32   c  and reports such a position to the controller  34 . In addition, when the upper monitor frame  27   c  is placed behind the lower monitor frame  27   b , the center of the display  27  is changed its position. In this embodiment, the center of the display  27  is vertically lowered to the floor, compared to the position of before the position change.  
         [0054]     The supporter  27   d  includes a supporter driver  270   e . As similar to the arm driver  32   c , the supporter driver  270   e  may be, for example, an air cylinder, a hydraulic cylinder, or an electric power cylinder, so as to be controlled its length. The supporter driver  270   e  is driven by a supporter driving unit  27   f  provided in the display holder  27   a . The supporter driving unit  27   f  may be, for example, an air compressor, a hydraulic pump, or a servomotor, and be connected to the supporter driver  270   e . The supporter driving unit  27   f  may be controlled by the display supporter driver  36 . In the above case, responsive to the report from the position sensor  33  and maybe also from the rail sensor  31 , the controller  34  may also control the display supporter driver  36  so that the display supporter driver  36  controls the supporter driving unit  27   f  The supporter driving unit  27   f  drives the supporter driver  270   e  to change its length. Accordingly, the display  27  may be pulled up towards the ceiling and adjust its position to the height appropriate to observe images displayed in the display  27 .  
         [0055]     On the other hand, when the rail sensor  31  senses the second imaging system coming back towards the bed table  25 , the action of the display  27  and its peripherals may obviously be the opposite to the above description. As a result, the upper monitor frame  27   c  can be lifted up to its original position, and accordingly the display  27  presents four monitors again.  
         [0056]     In addition, the change of arranging the monitors of the display  27  is not limited to whether the X-ray diagnosis apparatus is operated in the bi-plane mode or in the single-plane mode. Sensing any other actions, triggers, or manual changes may be applicable as alternative embodiments of the present invention.  
         [0057]      FIG. 6  is a diagram showing a side aspect of the display  27  and its peripherals with the monitors placed at an original position according to an embodiment of the present invention As shown in  FIG. 6 , when the upper monitor frame  27   c  gets placed behind the lower monitor frame  27   b , the upper monitor frame  27   c  is folded towards the lower monitor frame  27   b  so that a back  60  of the upper monitor frame  27   c  is faced with a back  61  of the lower monitor frame  27   b . Here, the folding is achieved by rotation of the upper monitor frame  27   c  around an axis A. Therefore, there is required quite a wide space behind the upper monitor frame  27   c  and the lower monitor frame  27   b  so as to allow the upper monitor frame  27   c  to rotate around the axis A. A preferable height B of the display  27  may be determined to become a border between the upper monitor frame  27   c  and the lower monitor frame  27   b . In other words, the center of the display  27  in the vertical direction may be set to the height B. When the center of the display  27  in the vertical direction is set to the height B, the center of the lower monitor frame  27   b  in the vertical direction is positioned at the height C.  
         [0058]      FIG. 7  is a diagram showing a side aspect of the display  27  and its peripherals with the monitors placed at a folded position according to an embodiment of the present invention As shown in  FIG. 7 , when the upper monitor frame  27   c  is folded to the lower monitor frame  27   b , the display  27  is controlled to change its height so that the center of the display  27  in the vertical direction still keeps the height B. Here, the center of the display  27  is identical with the center of the lower monitor frame  27   b . Therefore, the display  27  is pulled up a distance (B-C) to keep the preferable height B, by controlling the length of the supporter driver  270   e . When the upper monitor frame  27   c  gets returned to its original position, that is, a position on top of the lower monitor frame  27   b , the upper monitor frame  27   c  is rotated around the axis A again.  
         [0059]     The folding aspects of the upper monitor frame  27   c  described with  FIGS. 6 and 7  will be clearer in  FIG. 8   FIG. 8  is a diagram showing side aspects of the display  27  when the upper monitor frame  27   c  is folded according to an embodiment of the present invention. In  FIG. 8 , to make it easy to understand the folding, the top end of the upper monitor frame  27   c  is marked ‘K’ while the bottom end of the upper monitor frame  27   c  is marked ‘L’. Similarly, the top end of the lower monitor frame  27   b  is marked ‘M’ while the bottom end of the lower monitor frame  27   b  is marked ‘N’. When the folding has been completed, the top end K of the upper monitor frame  27   c  faces the bottom end N of the lower monitor frame  27   b  Further, the bottom end L of the upper monitor frame  27   c  faces the top end M of the lower monitor frame  27   b    
         [0060]     Alternatively, the upper monitor frame  27   c  of the display  27  may be placed behind the lower monitor frame  27   b  of the display  27  in the following manners.  
         [0061]      FIG. 9  is a diagram showing another side aspect of the display  27  and its peripherals with the monitors placed at an original position according to an embodiment of the present invention. In  FIG. 9 , there is a variable arm  32   d  in connection with the L arm  32   b  and the arm driver  32   c , instead of the straight arm  32   a  The variable arm  32   d  varies its length flexibly. When the upper monitor frame  27   c  gets placed behind the lower monitor frame  27   b , the upper monitor frame  27   c  slides to the backside of the lower monitor frame  27   b  so that a front  62  of the upper monitor frame  27   c  is faced with the back  61  of the lower monitor frame  27   b . Since the upper monitor frame  27   c  slides quite linearly, there is required only a narrow space behind the upper monitor frame  27   c  and the lower monitor frame  27   b  so that the display  27  and its peripherals can become more compact and so allow the doctor and the radiological technologist a more space around the bed table  25 . The preferable height B of the display  27  may be determined to become a border between the upper monitor frame  27   c  and the lower monitor frame  27   b . As similar to  FIG. 6 , the center of the display  27  in the vertical direction may be set to the height B. When the center of the display  27  in the vertical direction is set to the height B, the center of the lower monitor frame  27   b  in the vertical direction is positioned at the height C.  
         [0062]      FIG. 10  is a diagram showing a side aspect of the display  27  and its peripherals with the monitors placed at a slid position according to an embodiment of the present invention. As shown in  FIG. 10 , when the upper monitor frame  27   c  slides to the backside of the lower monitor frame  27   b , the display  27  is controlled to change its height so that the center of the display  27  in the vertical direction still keeps the height B. Here the center of the display  27  is identical with the center of the lower monitor frame  27   b . Therefore, as similar to  FIG. 7 , the display  27  is pulled up a distance (B-C) to keep the preferable height B, by controlling the length of the supporter driver  270   e . When the upper monitor frame  27   c  gets returned to its original position, that is, a position on top of the lower monitor frame  27   b , the upper monitor frame  27   c  slides back upwards.  
         [0063]     The sliding aspects of the upper monitor frame  27   c  described with  FIGS. 9 and 10  will be clearer in  FIG. 11 .  FIG. 11  is a diagram showing side aspects of the display  27  when the upper monitor frame  27   c  slides according to an embodiment of the present invention. In  FIG. 11 , to make it easy to understand the sliding, each end of the upper monitor frame  27   c  and the lower monitor frame  27   b  is marked the same reference as in  FIG. 8 . When the sliding has been completed, the top end K of the upper monitor frame  27   c  faces the top end M of the lower monitor frame  27   b . Further, the bottom end L of the upper monitor frame  27   c  faces the bottom end N of the lower monitor frame  27   b .  
         [0064]      FIG. 12  shows an alternative example of the sliding described in FIGS.  9  to  11  and is a diagram showing another side aspect of the display  27  when the upper monitor frame  27   c  slides according to the embodiment of the present invention. The alternative example shown in  FIG. 12  is a case that the upper monitor frame  27   c  may slide to the front of the lower monitor frame  27   b  so that the back  60  of the upper monitor frame  27   c  is faced with a front  63  of the lower monitor frame  27   b . To make it easy to understand the sliding, each end of the upper monitor frame  27   c  and the lower monitor frame  27   b  is marked the same reference as in  FIG. 11 . When the sliding has been completed, the top end K of the upper monitor frame  27   c  faces the top end M of the lower monitor frame  27   b . Further, the bottom end L of the upper monitor frame  27   c  faces the bottom end N of the lower monitor frame  27   b .  
         [0065]     According to embodiments of the present invention, the display arrangement can be performed in various ways. In the above description, holding and sliding techniques have been described in terms of viewing the display  27  from its side aspect. Embodiments of the present invention may not be limited to those described above. Further examples of the display arrangement will be described with reference to FIGS.  13  to  20 . FIGS.  13  to  20  show various arrangement forms of the monitors. However, these are only exemplary forms and embodiments of the present invention are not limited to these. Each of the arrangement forms may utilize one or more of the folding and/or the sliding techniques described above.  
         [0066]      FIG. 13  is a diagram showing a first arrangement viewed from a front aspect of a display according to an embodiment of the present invention.  
         [0067]     As shown in  FIG. 13 , the display may comprise four monitors P, Q, R, and S. The monitors P and Q may be placed behind the monitors R and S as described in  FIG. 8  or  11 . Similarly, the monitors R and S may be placed in front of the monitors P and Q. In a third way, the monitor P may be placed behind the monitor Q and the monitors P and Q may be placed behind the monitor S by sliding. In a fourth way, the monitor P may be placed in front of the monitor Q and the monitors P and Q may be placed behind the monitor S by folding. In similar manner, there are more possible ways for achieving this arrangement. Accordingly, the monitors R and S are used to display images.  
         [0068]      FIG. 14  is a diagram showing a second arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0069]     As shown in  FIG. 14 , the display may comprise four monitors P, Q, R, and S. The monitors R and S may be placed behind the monitors P and Q. Similarly, the monitors P and Q may be placed in front of the monitors R and S as described in  FIG. 12 . In a third way, the monitor S may be placed behind the monitor R and the monitors R and S may be placed behind the monitor P by sliding. In a fourth way, the monitor S may be placed in front of the monitor R and the monitors R and S may be placed behind the monitor P by folding In similar manner, there are more possible ways for achieving this arrangement. Accordingly, the monitors P and Q are used to display images.  
         [0070]      FIG. 15  is a diagram showing a third arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0071]     As shown in  FIG. 15 , the display may comprise four monitors P, Q, R, and S. The monitors Q and S may be placed behind the monitors P and R. Alternatively, the monitors P and R may be placed in front of the monitors Q and S. Further, the monitor Q may be placed behind the monitor S and the monitors Q and S may be placed behind the monitor R by sliding. Further still, the monitor Q may be placed in front of the monitor S and the monitors Q and S may be placed behind the monitor R by folding. In similar manner, there are more ways for achieving this arrangement. Accordingly, the monitors P and R are used to display images.  
         [0072]      FIG. 16  is a diagram showing a fourth arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0073]     As shown in  FIG. 16 , the display may comprise four monitors P, Q, R, and S. The monitors P and R may be placed behind the monitors Q and S. Alternatively, the monitors Q and S may be placed in front of the monitors P and R. Further, the monitor R may be placed behind the monitor P and the monitors P and R may be placed behind the monitor Q by sliding. Further still, the monitor R may be placed in front of the monitor P and the monitors P and R may be placed behind the monitor Q by folding. In similar manner, there are more ways for achieving this arrangement. Accordingly, the monitors Q and S are used to display images.  
         [0074]      FIG. 17  is a diagram showing a fifth arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0075]     As shown in  FIG. 17 , the display may comprise two monitors P and R. The monitor P may be placed behind the monitor R. It is another way that the monitor R may be placed in front of the monitor P. Accordingly, the monitor R is used to display images. Alternatively, the monitor R may be placed behind the monitor P. It is another way that the monitor P may be placed in front of the monitor R. Accordingly, the monitor P is used to display images.  
         [0076]      FIG. 18  is a diagram showing a sixth arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0077]     As shown in  FIG. 18 , the display may comprise two monitors P and Q. The monitor Q may be placed behind the monitor P. It is another way that the monitor P may be placed in front of the monitor Q. Accordingly, the monitor P is used to display images. Alternatively, the monitor P may be placed behind the monitor Q. It is another way that the monitor Q may be placed in front of the monitor P. Accordingly, the monitor Q is used to display images.  
         [0078]      FIG. 19  is a diagram showing a seventh arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0079]     As shown in  FIG. 19 , the display may comprise four monitors P. Q. R, and S. The monitor S may be placed behind the monitor Q. It is another way that the monitor S may be placed behind the monitor R. Accordingly, the monitors P, Q, and R are used to display images.  
         [0080]      FIG. 20  is a diagram showing a eighth arrangement viewed from the front aspect of the display according to an embodiment of the present invention.  
         [0081]     As shown in  FIG. 20 , the display may comprise four monitors P, Q, R, and S. It is the first way that the monitors Q and S may be placed behind the monitors P and R and the monitors R and S may be placed behind the monitors P and Q. It is the second way that the monitors R and S may be placed behind the monitors P and Q and the monitors Q and S may be placed behind the monitors P and R. It is the third way that the monitor S may be placed behind the monitors Q and the monitors Q and S may be placed behind the monitor P, and in addition, the monitor R may be placed behind the monitors P, Q, and S. In similar manner, there are more ways for achieving this arrangement. Accordingly, the monitor P is used to display images.  
         [0082]     The arrangement of monitors of the display can be changed in various manners as described above. When the X-ray diagnosis apparatus is operated in the single-plane mode, it may not be necessary to move the second imaging system towards the back. Whether the second imaging system is moved or not, it may not be necessary that the display arrangement always automatically corresponds to the mode of whether bi-plane or single-plane.  
         [0083]     Further, the X-ray diagnosis apparatus according to embodiments of the present invention is not limited to the bi-plane apparatus, but may also be applied to an ordinary X-ray diagnosis apparatus with only one imaging system as shown in  FIG. 21 .  
         [0084]     Still further, the principles of the present invention may also be applied to other medical diagnosis apparatuses, such as, for example, an X-ray CT apparatus, an MRI apparatus, a nuclear medical diagnosis apparatus, an ultrasound diagnosis apparatus, and an endoscopic image apparatus.  
         [0085]     For manual operations, by the doctor, the radiological technologist, or the like, of the display arrangement and/or the height of the display  27 , it may be possible to provide the operation unit  29  with one or more buttons or switches for an exclusive use in such manual operations. According to input operations with the buttons or switches in the operation unit  29 , the input information may be sent to the controller  34 . The controller  34  controls the link mechanism driver  35  and the display supporter driver  36 . The link mechanism driver  35  controls the arm driving unit  27   e  which drives the arm driver  32   c  so as to change the arrangement of the monitors. The display supporter driver  36  controls the supporter driving unit  27   f  which drives the supporter driver  270   e  so as to change the height of the display  27 .  
         [0086]     Alternatively, if the arrangement of monitors and/or the height of the display  27  are changed in manual without any electrical input operations, it may be achieved by reducing or removing load or holding power of the arm driver  32   c  and/or the supporter driver  270   e  so as to allow the doctor or the like to make the arrangement of the display by himself. However, the weight of the display  27  or monitors may be a problem for such direct manual operations. Therefore, it may be necessary to prepare a fixer, such as fixing screws, to fix the display  27  or monitors to the supporter  27   d  or the monitor link mechanism  32  at a desired position. Further, it may also be necessary to prepare a helper, such as gas springs, in the monitor link mechanism  32  for the purpose of helping manual operations of the doctor or the like.  
         [0087]     Still furthermore, the mechanism of how to connect the monitors of the display is not limited to those disclosed in the embodiment of the present invention, but can apply any other mechanism including various well-known mechanism thereto.  
         [0088]     According to embodiments of the present invention, the arrangement of a plurality of monitors of a display can advantageously be changed. In the arrangement of the monitors, the number of the monitors to be spread out can be reduced by superposing a part of the monitors on the rest of the monitors. Therefore, it may make it possible to reduce a space occupied by the display around the bed table (or a patient) so that a doctor, a radiological technologist, or the like can concentrate on his or her work. This results in improving a quality of his or her manipulation.  
         [0089]     The embodiments of the present invention described above are examples described only for making it easier to understand the present invention, and are not described for the limitation of the present invention. Consequently, each component and element disclosed in the embodiments of the present invention may be redesigned or modified to its equivalent within a scope of the present invention. Furthermore, any possible combination of such components and elements may be included in a scope of the present invention as long as an advantage similar to those obtained according to the alcove disclosure in the embodiments of the present invention is obtained.