Computer tomography apparatus with detector which is rotatable s

Details Computer tomography apparatus with detector which is rotatable s Computer tomography apparatus with detector which is rotatable s

1990-09-18

1991-07-02

Westin, Edward P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 11, 378 14, 378 7, 378 19, 378196, H05G 102, H05G 160

Patent

active

050291920

ABSTRACT:
A computer tomography apparatus has an x-ray source which emits a fan-shaped x-ray beam which irradiates a slice of an examination subject. The x-ray source is rotatable around the examination subject to irradiate the slice from different angular directions in the plane of the slice. A row of detector elements is disposed to receive radiation attenuated by the examination subject as the x-ray source rotates around the patient. The radiation detector is disposed on a ring which is rotatable around the examination subject separately from the x-ray source. This permits to meet the conditions of the sampling theorem, applied to the projections with the focus as projection center, without increasing the number of defectors.

REFERENCES:
patent: 4417354 (1983-11-01), Pfeifer
patent: 4578801 (1986-03-01), Oliver
patent: 4592080 (1986-05-01), Rauch et al.
patent: 4677554 (1987-06-01), Dobbs et al.
patent: 4769827 (1988-09-01), Uno et al.
patent: 4853946 (1989-08-01), Elliot et al.

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