X-Ray apparatus for determining the absorption distribution in a

Details X-Ray apparatus for determining the absorption distribution in a X-Ray apparatus for determining the absorption distribution in a

1980-05-14

1983-02-01

La Roche, Eugene

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378152, 378147, G21K 104, G01N 2308

Patent

active

043719767

ABSTRACT:
The invention relates to a computer tomography apparatus for determining the absorption distribution in a relevant zone of a body, this zone being irradiated by unattenuated radiation, while the part of the body which is situated outside this zone is irradiated at the most by attenuated radiation. The radiation outside the relevant zone is attenuated in accordance with the invention by means of absorber pieces which are moved to and fro during an examination in a direction parallel to the rotary shaft around which the X-ray source is rotated. As a result, the intensity of the radiation is modulated in the time outside the zone, so that on average it is attenuated, without giving rise to hardening effects.

REFERENCES:
patent: 4114041 (1978-09-01), Oliver
patent: 4145610 (1979-03-01), Perilhou
patent: 4181858 (1980-01-01), Moore
patent: 4286156 (1981-08-01), Wagner

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