Source: http://www.google.com/patents/US8086010?dq=7181427
Timestamp: 2017-04-30 13:21:59
Document Index: 748199113

Matched Legal Cases: ['art 26', 'art 41', 'art 42', 'art 41', 'art 41', 'art 41', 'art 44', 'art 42', 'art 43', 'art 44', 'art 45', 'art 45', 'art 45', 'art 46', 'art 45', 'art 46', 'art 46', 'art 47', 'art 47', 'art 47', 'art 46', 'art 47', 'art 41', 'art 42', 'art 45', 'art 46', 'art 47']

Patent US8086010 - Medical image diagnosis apparatus and the control method thereof - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsObtain a tomographic image of a patient table in advance in a state in which the object is not placed on the patient table. Obtain a tomographic image of the patient table with the object placed on the patient table. This tomographic image consists of an image of a patient table. The displacement calculation...http://www.google.com/patents/US8086010?utm_source=gb-gplus-sharePatent US8086010 - Medical image diagnosis apparatus and the control method thereofAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8086010 B2Publication typeGrantApplication numberUS 11/771,422Publication dateDec 27, 2011Filing dateJun 29, 2007Priority dateJun 30, 2006Fee statusPaidAlso published asUS20080123924Publication number11771422, 771422, US 8086010 B2, US 8086010B2, US-B2-8086010, US8086010 B2, US8086010B2InventorsTakeo Nabatame, Tomiya SasakiOriginal AssigneeKabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (87), Non-Patent Citations (2), Referenced by (5), Classifications (16), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMedical image diagnosis apparatus and the control method thereof
US 8086010 B2Abstract
Obtain a tomographic image of a patient table in advance in a state in which the object is not placed on the patient table. Obtain a tomographic image of the patient table with the object placed on the patient table. This tomographic image consists of an image of a patient table. The displacement calculation part determines the vertical displacement of images of the patient table in a non-loaded state and the tomographic image of the patient table in a loaded state. Meanwhile, markers are placed on the side of the patient table to indicate the displacement detecting position (reference position). The corrected image-forming part corrects the vertical positions of image data of the tomographic image in the loaded state based on the calculated displacement.
This invention is intended to provide a medical image diagnosis apparatus and its control method that can correct the displacement of the patient table without implementing a major alteration to the hardware configuration of the apparatus.
FIG. 1 is a schematic perspective view showing an example of the appearance of the composition of a conventional medical image diagnosis apparatus (X-ray CT apparatus).
Embodiments of the medical image diagnosis apparatus and control method thereof related to the invention is described in detail with reference to the accompanying drawings. In this embodiment, the construction parts similar to the explained configuration will be described with the same symbols shown in FIG. 1 and FIG. 2.
The examination table 3 comprises a patient table 31 and an examination table base 32 as shown in FIG. 6 and FIG. 1. The examination table base 32 houses the patient table drive 33 that moves the patient table 31 in an anteroposterior direction (z-direction), up and down direction (y-direction), and longitudinal direction (x-direction) respectively. The z-direction is explained as an example of “the specified patient table moving direction” of this invention.
A plurality (n) of markers 31 (1) to 31 (n) are provided on the side of the patient table 31 as shown in FIG. 6. These markers 31 (i) (i=1 to n), for example, are provided evenly spaced apart (let d=the space between the adjacent markers). Each marker 31 (i) is used as an example to show the “reference position” of this invention. Each marker 31 (i), for example, is formed with material having a different X-ray absorption from that of the patient table 31.
The gantry 2 houses a support 21 that supports the X-ray tube 22 and X-ray detector 23 as shown in FIG. 2. The X-ray tube 22 radiates X-ray based on high voltage having specified tube voltage and tube current applied by a high-voltage transformer assembly 24 shown in FIG. 5, and is explained as an example of the “X-ray generator” of this invention.
The X-ray detector 23, supported at the location opposite to the X-ray tube 22 over the opening 2A of the gantry 2 as shown in FIG. 6 and FIG. 1, has arrayed multiple X-ray detection elements that detect X rays generated from the X-ray tube 22. The X-ray detector 23 is explained as an example of the “X-ray detector” of this invention.
The support drive section 25 rotates the support 21 along the circumference of the opening 2A. By this, the X-ray tube 22 and X-ray detector 23 rotate along the circumference of the opening 2A in an unified manner to scan the object P with X-ray beams from various directions. The X-ray detector 23 detects the X-ray beams that have transmitted the object P and patient table 31 and delivers the data of the transmitted X-ray dosage to the data acquisition part 26. Furthermore, the support drive section 25 executes the operation that tilts the support 21 to the object P (patient table 31). The support drive section 25 functions as an example of “rotary drive” of this invention.
The gantry 2 acquires data of the X-ray dosage (scan data) that transmitted the object P and patient table 31 by executing the above mentioned operation. The gantry 2 functions as an example of “data acquisition part” of this invention.
The computer 4 comprises a device control part 41 and image processing part 42. The device control part 41 controls the operations of the each part of the X-ray CT apparatus 1, including the high-voltage transformer assembly 24, support drive section 25, patient table drive 33 and monitor 5, etc. The device control part 41 comprises, for example, a microprocessor, etc. The device control part 41 functions as an example of the “scan controller” of this invention.
Herein, when performing a helical scan, an image constructing method with interpolation processing of image, for example, 360° interpolation method, 180° interpolation method, 180° extrapolation method, opposite ray interpolation method, filter method, is applied. The reconstructing part 44 comprises, for example, a circuit board and microprocessors, etc., that execute the reconstruction process by the above mentioned image reconstruction method.
Here, the image processing part 42 (computer 4) including the preprocessing part 43 and reconstructing part 44 functions as an example of the “image data producing part” of this invention.
The displacement calculation part 45 performs a processing of calculating displacement between the position of the patient table 31 in an up-and-down direction (y-direction) formed in a non-loaded state and the position of the tabletop 31 in a loaded state. In the non-loaded state, the object P is not placed on the patient table. In the loaded state, the object P is placed on the patient table. The computing process is executed based on the each image data of the image including the image of the patient table 31 acquired in both the non-loaded state and the loaded state. The detail about the computing process will be described hereinafter. The displacement calculation part 45 comprises microprocessor, etc., that execute the computing process. The displacement calculation part 45 functions as an example of the “displacement calculation part” of this invention.
The tilt angle calculation part 46 performs a processing of calculating the tilt angle of a tomographic image (axial image) of the patient table 31 in the non-loaded state and a tomographic image (axial image) of the patient table 31 (object P) in the loaded state based on the displacement calculated by the displacement calculation part 45. The details of the computing process will be described hereinafter. The tilt angle calculation part 46 comprises a microprocessor, etc., that execute the computing process. The tilt angle calculation part 46 functions as an example of the “tilt angle computing method” of this invention.
The correction image forming part 47 performs a processing of correcting the position of the image data of the object P and patient table 31 corresponding to the up-and-down direction (y-direction) based on the displacement calculated by the displacement calculation part. The details of the correction process will be described hereinafter. The correction image forming part 47 functions as an example of the “correction part” of this invention by performing such an image position correction process.
Here, the direction corresponding to the y-direction means the direction in the image data corresponding to the y-direction in real space. For example, said corresponding direction in axial image will be upward direction of the image. Said direction may simply be referred to as “y-direction” by equating the direction in real space with the direction in image data.
Meanwhile, the correction image forming part 47 performs a processing of forming image data of a tomographic image with the tilt angle corrected by the tilt angle calculated by the tilt angle calculation part 46. The details of the processing will be described hereinafter. The correction image forming part 47 functions as an example of the “image data producing part” of the invention by performing such correction image forming processing.
Here, the device control part 41 and (the computer 4 comprising) the image processing part 42 function as an example of the “computer” of this invention. In addition, the image-processing part that includes the 42 displacement calculation part 45, tilt angle calculation part 46 and correction image forming part 47 functions as an example of “image data processing part” of this invention.
To begin with, an image of the patient table 31 is acquired in a non-loaded state in which the object P is not placed on the patient table (S1). This acquired image consists of the image of the patient table 31 (here, it is a tomographic image with its cross-section as xy-flat surface) and is explained as an example of the “first image” of this invention. This image data of the acquired image in the non-loaded state is, for example, stored in the above mentioned storage device such as a hard disk drive, etc.
Next, an image of the object P and patient table 3 will be scanned with the object P placed on the patient table 31(S2) This acquired image consists of the image of the object P and patient table 31 (a tomographic image with its cross-section as xy-flat surface) and is explained as an example of the “second image” of this invention. The tomographic image acquired in this step S2 is a tomographic image that is located in generally the same location as the tomographic image of the patient table 31. The image data of the acquired image in the loaded state is, for example, stored in the above mentioned storage device such as a hard disk drive.
Here, information including patient information of said object P and setting information at acquiring the image will be stored with the image data. Here, the patient information is various information related to said object P including patient ID, name and birth date. In addition, the setting information at acquiring an image includes information such as the setting value of tube voltage and tube current, setting value of slice location and slice interval that indicate the forming location of the tomographic image (axial image), helical pitch (the movement distance of the patient table 31 in a helical scan during the period the X-ray tube 22 and X-ray detector 23 rotate 360°) etc. This information is, for example, added to the image data as additional information of DICOM (Digital Imaging and Communications in Medicine).
Modified Embodiments of the First Type of Usage
Described hereinafter are modified embodiments of the first type of usage of the X-ray CT apparatus 1.
According to the above mentioned first type of usage, markers 31 (i) are provided at the location for determining the displacement of the patient table 31 (reference position) in vertical direction to indicate the reference position. Instead of providing such markers 31 (i), distinctive positions of the patient table 31 may be set to reference positions to determine the displacement of the patient table 31.
In the above mentioned first type of usage, the markers 31 (i) are provided at the reference position that determines the displacement of the patient table 31 in vertical direction to determine the displacement of the image position of the patient table 31 in the non-loaded state and the position of the patient table 31 in the loaded state for each reference position, and correct the vertical position of the image of the object P at this reference position.
Modified Embodiment of the Second Type of Usage
Similar modifications as the first type of usage can also be given to the second type of usage of the X-ray CT apparatus 1 appropriately. Alternatively, the following modified embodiment can be applied.
As opposed to the above mentioned embodiment that have the markers 31(i) on only one side of the patient table 31, by having the markers on the both right and left sides to determine the displacement in vertical direction for each reference position at both right and left, misalignment of the quantity of deflection from the patient table 31 in longitudinal direction (x-direction) cab be detected. It allows to correct displacement of the tomographic image of the object P caused by the misalignment of the quantity of deflection from the patient table 31 in longitudinal direction, and allows to correct the tilt of the cross-section.
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