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X-ray CT system and control program

An X-ray and X-ray tube technology, applied in the field of X-ray CT device and its control, can solve the problems of inability to obtain high resolution and inability to make full use of detection

Inactive Publication Date: 2013-09-11
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, when X-rays emitted from a focal spot with a small focal spot size and transmitted through the subject are detected by an X-ray detection element with a large detector size, high resolution cannot be obtained during imaging, and the X-ray with a small detector size cannot be fully utilized. Radiation detection element

Method used

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  • X-ray CT system and control program

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Experimental program
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no. 1 Embodiment approach

[0043] refer to figure 1 , and the configuration of the X-ray CT apparatus according to the first embodiment will be described. figure 1 It is a block diagram showing the configuration of the X-ray CT apparatus.

[0044] like figure 1 As shown, the X-ray CT apparatus 1 has a gantry (gantry) 10 and a console 30 .

[0045] 〔shelf〕

[0046] The gantry 10 has a rotating frame 12 , an X-ray tube 16 , a collimator 17 , an X-ray detector 18 , a rotation driving unit 20 , a high voltage generating unit 22 , and a data acquisition circuit (DAS) 26 .

[0047] The main body of the stand 10 rotatably supports a circular or disk-shaped rotating frame 12 . On the inner peripheral side of the rotating frame 12, a scanning area where the subject P placed on the bed surface 14 is inserted is formed.

[0048] For a bed not shown, a bed surface moving unit 24 is provided to move the bed surface 14 in the longitudinal direction (the body axis direction of the subject P). In addition, the be...

no. 2 Embodiment approach

[0165] In the first embodiment, as the scan mode, the first mode in which the small detection range 181 is associated with the focal point F1 having a small focal size to perform CT scanning, and the large detection range 182 and the focal point F2 with a large focal size have been described. Or the second mode in which CT scanning is performed corresponding to the focal point F3 of the medium focal point size. According to the first mode, it is possible to shoot at high resolution. In addition, according to the second mode, imaging can be performed at a desired level of resolution, and imaging of the subject can be performed over a wide range.

[0166] In addition to the first mode and the second mode, in the scan mode, there is also a third mode in which CT scanning is performed using all of the X-ray detectors 18 . By adopting the third mode, projection data photographed at high resolution and projection data photographed at low resolution can be obtained simultaneously, a...

no. 3 Embodiment approach

[0198] Next, refer to Figure 16 as well as Figure 17 , the X-ray CT apparatus 1 according to the third embodiment will be described. In the above-mentioned third embodiment, configurations different from those in the above-mentioned embodiment will be mainly described, and the same configurations will be given the same reference numerals and their descriptions will be omitted.

[0199] In the X-ray CT apparatus 1 of the above-mentioned embodiment, when X-ray imaging is performed, the X-ray tube 16 and the X-ray detector 18 are rotated around the body axis, and the bed surface 14 is moved in the direction of the body axis while performing helical scanning. , by controlling the collimator 17 with the control unit, from effective focal points of different sizes to a specified detection area including a small detection range 181 of a small size and a large detection range 182 of a large size by making the X-ray detection element different in size, By irradiating X-rays, desire...

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Abstract

The invention dislcoses, upon imaging, projection data with a high resolution can be effectively obtained, and further, the X-ray detecting elements of small detector size can be sufficiently utilized.The X-ray CT system and control program thereof according to the embodiment comprise an X-ray tube, a collimator, and a controller. The X-ray tube has an emission surface of X-rays and is configured such that the size of an effective focal spot that is the apparent size of the emission surface when the emission surface is observed from the side where X-rays are irradiated is made smaller at one end of a cone angle and the size of the effective focal spot is made increasingly larger at the other end of the cone angle. The controller is configured to select the effective focal spot with any size from small to large by controlling the collimator.

Description

[0001] This application is based on Japanese Patent Application No. 2012-038398 (filing date: February 24, 2012), and enjoys priority benefits from this application. This application, by reference to this application, includes the entire contents of this application. technical field [0002] Embodiments of the present invention relate to an X-ray CT apparatus and a control method thereof. Background technique [0003] As a conventional X-ray CT (computed tomography) apparatus, the subject is irradiated from the X-ray tube, the X-rays transmitted through the subject are detected by the X-ray detector, projection data are collected, and an image is reconstructed from the collected projection data . [0004] The X-ray tube includes: an anode having an emission surface from which X-rays are emitted; and a cathode having a filament. The subject is irradiated with X-rays having a cone angle so as to spread in the body axis direction of the subject from the emission surface. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
CPCA61B6/032A61B6/4021A61B6/4233A61B6/5205G01N23/046G01N2223/419G01N2223/612
Inventor 塚越伸介
Owner KK TOSHIBA
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