X-ray computer tomography system and method

An X-ray tube and computing module technology, applied in the field of medical imaging, can solve the problems of not changing the opening of the collimator, not adjusting the exposure area of ​​the object to be inspected, and not considering the size change and shape change of the ROI, so as to reduce the X-ray dose , reduce extra exposure, easy to achieve effect
CN102397079AActive Publication Date: 2012-04-04SIEMENS SHANGHAI MEDICAL EQUIP LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SIEMENS SHANGHAI MEDICAL EQUIP LTD
Publication Date
2012-04-04

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Abstract

The invention discloses an X-ray computer tomography system, which comprises an X-ray tube, a collimator and a detector and is used for photographing a plurality of elliptical cross sections of an object to be detected in the scanning direction; the detector comprises a plurality of detector channels; the X-ray tube, the collimator and the detector synchronously rotate around the object to be detected; the collimator is provided with an adjustable opening; the X-ray computer tomography system also comprises a computation assembly and an adjustment assembly, wherein the computation assembly is used for computing opening widths of the collimator, which are required for irradiating each elliptical cross section, under different projection angles, and transmitting the opening widths to the adjustment assembly; and the adjustment assembly is used for adjusting the opening of the collimator according to the opening widths. The invention also discloses an X-ray computer tomography method. Due to adoption of the system and method disclosed by the invention, extra exposure of a surrounding area of the object to be detected can be reduced, and the X-ray dose accepted by a patient can be reduced.
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Description

technical field

[0001] The invention relates to the field of medical imaging, in particular to an X-ray computed tomography system and method. Background technique

[0002] In X-ray computed tomography (CT) system, dose characteristic is a very important performance index. Keeping the scanning dose as low as possible has become a general rule in the development of current CT systems. In a CT system, the field of measurement (FOM) is defined as the cross-sectional area where the object to be inspected gets full radiation when the X-ray tube rotates 360 degrees in a single rotation scan, which determines the direct detection of the object to be inspected. The scan dose applied and the size of the X-ray irradiated area.

[0003] Since the cross-sections of most organs or tissues of the human body have approximately elliptical outer contours, for a single rotation scan, when the X-ray tube irradiates the object to be inspected at different projection angles, the fixed circular...

Claims

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