X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1981-10-16
1984-08-07
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Scanner
378 13, G03B 4116
Patent
active
044647778
ABSTRACT:
Disclosed is a radiography apparatus comprising an X-ray tube for radiating X-ray beam in a fan shape, a detector for detecting the X-ray beam coming through a living body at a plurality of angular components of the X-ray beam, and a sampling circuit for sampling an output signal of the detector when the living body moves at a given speed in a direction orthogonal to the plane of the X-ray beam, whereby a radiogram is formed by using the output signal of the sampling circuit. In the radiography apparatus, the distance between the living body and the X-ray tube is variable and is detected by a potentiometer interlocked with the movement of the living body. A pulse signal at a frequency corresponding to an output level of the potentiometer is produced by a pulse frequency modulation circuit, and is supplied as a timing signal to the sampling circuit. Thus, a sampling frequency of the sampling circuit is determined by the distance between the X-ray tube 10 and the living body, so that a radiogram with the same enlargement factor in the X and Y directions is obtained.
REFERENCES:
patent: 4134020 (1979-01-01), Zonneveld
patent: 4174481 (1979-11-01), Liebetruth
Church Craig E.
Tokyo Shibaura Denki Kabushiki Kaisha
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