X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1982-04-26
1985-01-08
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Scanner
378145, G03B 4116
Patent
active
044930984
ABSTRACT:
The invention relates to a collimator employed in X-ray equipment, which collimator comprises three or more perforated collimator plates. The purpose of the collimator is to prevent stray radiation, i.e. radiation scattered from the object under examination, from falling on the film. In a collimator according to the invention the collimator plates are arranged to form two groups. At least one collimator plate is located between the X-ray radiation source and the object under examination, and two or more collimator plates are located between the object and the X-ray film cassette. The holes of the collimator plates are superposed when seen from the focal point of the radiation source. The plate located nearest to the X-ray film casette is longer than the rest. It prevents stray radiation from falling on the film in the X-ray film cassette, when the collimator is moved between its extreme positions during the photography operation. On the line determined by the focal point of the X-ray tube there is adjusted a rod, whereto the collimator plates are in turn geared so that they remain horizontal during the photography operation. The holes of the collimator plates have a similar, for example diamond-like shape, and they are arranged in rows obliquely with respect to the transition direction of the collimator, in such a fashion that the back end of a row falls next to the front end of the following row.
REFERENCES:
patent: 4096391 (1978-06-01), Barnes
patent: 4097748 (1978-06-01), Monvoisin
Korhola Ossi
Riihimaki Esko
Church Craig E.
Radiographic Screens Oy
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