X-ray CT scanner

Details X-ray CT scanner X-ray CT scanner

1996-02-15

1997-11-04

Wong, Don

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378145, 378 7, G21K 1112

Patent

active

056848552

ABSTRACT:
Only an umbra of an X-ray beam is allowed to enter a designated detecting device arrays of an X-ray detector, whereby stable and good X-ray detection signals and images are provided. Even if a focal spot in an X-ray tube shifts, occurrence of artifacts or shifts of CT numbers is prevented to improve image quality. An X-ray CT scanner comprises an X-ray tube and X-ray detector, which are opposed to each other with a patient lying down on a couchtop between them, and a pre-collimator inserted between the X-ray tube and patient for restricting the width in a slice direction of an X-ray beam irradiated by the X-ray tube. The X-ray detector consists of, for example, a two-dimensional detector in which a plurality of detecting device arrays are arranged in the slice direction, each detecting device array including a plurality of detecting channels. The scanner further comprises a unit for controlling the pre-collimator in a manner that a detecting device array designated among the plurality of detecting device arrays receives only an umbra of the X-ray beam. An X-ray CT image is reconstructed using data detected by the designated detecting device arrays.

REFERENCES:
patent: 4630202 (1986-12-01), Mori
patent: 5386446 (1995-01-01), Fujimoto et al.
patent: 5430783 (1995-07-01), Hu et al.

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