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Beam hardening post-processing method and x-ray ct apparatus

A ray beam and X-ray technology, applied in the field of post-processing of ray beam curing and X-ray CT equipment, can solve the problem of heavy workload of operators and other problems

Inactive Publication Date: 2004-06-16
GE MEDICAL SYST GLOBAL TECH CO LLC
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Problems solved by technology

[0008] Especially in obtaining calibration information for X-ray CT equipment, it is necessary to use two or three phantoms with a diameter of 20 to 50 cm and perform imaging, which takes more than 100 minutes just to improve the correction accuracy, which gives The operator brings a heavy workload

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  • Beam hardening post-processing method and x-ray ct apparatus

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Embodiment Construction

[0055] Hereinafter, preferred embodiments of the post-processing method of radiation beam curing and the X-ray CT apparatus according to the present invention will be described with reference to the accompanying drawings.

[0056] First, the general structure of the X-ray CT apparatus of this embodiment will be described. figure 1 A block diagram representing an X-ray CT apparatus. like figure 1 As shown, the device includes a scanning turntable 2 and an operating table 6 .

[0057] The scanning turret 2 has an X-ray tube 20 . X-rays (not shown) emitted from the X-ray tube 20 are formed into a fan-shaped X-ray beam, ie, fan-beam X-rays, by, for example, a collimator 22 and projected to an X-ray detector 24 .

[0058] The X-ray detector 24 has a plurality of X-ray detector units arranged in a linear array in the extending direction of the fan beam X-rays. The X-ray detector 24 is a multi-channel detector in which a plurality of X-ray detector units are arranged in a linea...

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Abstract

A beam hardening post-processing method that can improve the accuracy of channel-by-channel correction on a BH effect easily and yet taking a non-linear effect into account, phantoms of different diameters are disposed at a position offset from an imaging center to acquire projection information having a transmission length of an X-ray beam varying from view to view, hence, acquire projection information having a projection information value varying from view to view, for each channel, correction factors are determined, and a corrective function containing even a non-linear effect is determined by higher-order function fitting from the correction factors; and therefore, correction with high accuracy can be achieved in the channel-by-channel correction on the projection information values conducted after BH correction, and moreover, correction with high accuracy can be achieved using a smaller amount of phantom projection information, thus reducing the time for calibration work.

Description

technical field [0001] The present invention relates to a beam curing (hereinafter sometimes abbreviated as 'BH') post-processing method and X-ray CT apparatus for correcting the intensity of X-rays penetrating a subject based on phantom data. Background technique [0002] An X-ray source used in an X-ray CT apparatus outputs X-rays with a certain range of energies. On the other hand, the linear absorption coefficient of X-rays penetrating a subject depends on the energy of the X-rays, and exhibits a beam curing effect whereby the average energy shifts to a higher level as the transmission length through the subject becomes larger. Thus, the X-ray transmission intensity, ie, the projection information value, and the transmission length do not maintain a proportional relationship with each other, ie, exhibit a non-linear relationship with each other. [0003] The BH effect leads to a cupping effect, whereby the intensity decreases in the middle of the restored image, and its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00A61B6/03G01N23/04
CPCY10S378/901G01N23/04A61B6/032A61B6/585A61B6/583A61B6/03
Inventor 贯井正健谷川俊一郎
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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