Computer tomography apparatus with beam thickness adjustment

Details Computer tomography apparatus with beam thickness adjustment Computer tomography apparatus with beam thickness adjustment

1993-12-10

1994-12-27

Porta, David P.

X-ray or gamma ray systems or devices

Beam control

Collimator

378147, 378150, 378 4, G21K 104

Patent

active

053772520

ABSTRACT:
In a computer tomography apparatus having an x-ray radiator and a radiation detector rotatable on a frame around an examination subject, so that an x-ray beam is also rotated around the subject, the plates of a primary radiation diaphragm are controlled so that the thickness of the x-ray beam, measured in a direction perpendicular to its propagation direction, is varied dependent on the rotational angle of the x-ray beam. During examination of subjects having a highly elliptical cross-section, image artifacts are avoided because the beam thickness is varied so that more quanta reach the detector in the angular range wherein the most pronounced radiation attenuation occurs, thereby reducing the noise in the detector signal.

REFERENCES:
patent: 5228070 (1993-07-01), Mattson
patent: 5235627 (1993-08-01), Takagi
"Performance Issues in Computed Tomography Specifications" Burstein, Materials Evaluation, vol. 48, May 1980 (pp. 579-593).

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