X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-02-06
2000-01-11
Bruce, David Vernon
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, A61B 603
Patent
active
060144203
ABSTRACT:
An X-ray CT apparatus is disclosed which has a simple construction and yet is capable of correcting the sensitivity of each X-ray detecting element in response to a focal shift of an X-ray tube. A monitoring detector is formed of eight channels at an end of an X-ray detector for receiving X-rays not penetrating a patient. The eight channels are divided into two regions F and R each having four channels. Each of the regions F and R is divided into two parts along the direction of a body axis. Shielding plates such as of lead (Pb) not penetrable by X rays are applied to the detecting elements in one of the two parts of region F and to those in the other of the two parts of region R. When no focal shift occurs with the X-ray tube, an output difference S0 is zero between a total output F0 of the X-ray detecting elements in the region F and a total output R0 of the X-ray detecting elements in the region R. When a focal shift occurs with the X-ray tube, an output difference S between a total output Rt of the X-ray detecting elements in the region F and a total output Rt of the X-ray detecting elements in the region R corresponds to an amount of shift.
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Bruce David Vernon
Shimadzu Corporation
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