Computerized tomography apparatus with means to periodically displace radiation source
Radiographic apparatus is described for evaluating the absorption coefficient of a body at each of a plurality of locations distributed over a planar slice disposed cross-sectionally of the body. A source is arranged to produce a fan-shaped, planar beam of radiation which is directed through the body, in the plane of said slice, and the source is orbited around the body about an axis perpendicular to the plane of said slice. Detectors are provided, and orbited in synchronism with the orbital motion of the source, each to detect the radiation emergent from the body along a plurality of paths. In order to render the paths substantially linear despite the orbital motion, a lateral scan is imposed upon the source which is sufficient, over a predetermined time period, to substantially cancel the orbital motion and replace it by a lateral motion.
- Assignee:
- EMI Ltd.
- Patent Number(s):
- US 4010370
- OSTI ID:
- 5113393
- Country of Publication:
- United States
- Language:
- English
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