X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1989-09-15
1991-02-19
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 19, G01N 2300
Patent
active
049951076
ABSTRACT:
A computer tomography apparatus includes an x-ray source which irradiates an examination subject, thereby producing attenuated primary radiation, and scatter radiation. A row of detector elements for the attenuated primary radiation is, during normal operation, disposed behind the examination subject in registry with the x-ray beam. During an examination, the x-ray source and the detector row are rotated around an axis to irradiate the examination subject from different directions. A second row of detector elements, for detecting the scatter radiation, is, during normal operation, disposed next to the primary radiation detector row in the direction of the axis of rotation. During calibration using a standardized scatter element as the examination subject, the primary radiation detector row can be axially displaced to occupy the position normally occupied by the scatter radiation detector row. After calibration, the detector rows are axially displaced in the opposite direction so as to return to their normal operating positions.
REFERENCES:
patent: 3937965 (1976-02-01), Vasseur
patent: 4149080 (1979-04-01), Schittenhelm
patent: 4176280 (1979-11-01), Greschat et al.
Church Craig E.
Siemens Aktiengesellschaft
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