X-ray or gamma ray systems or devices – Accessory – Alignment
Patent
1982-02-23
1984-01-17
Smith, Alfred E.
X-ray or gamma ray systems or devices
Accessory
Alignment
378207, G01N 2100, G03B 4116
Patent
active
044267266
ABSTRACT:
An apparatus and method are disclosed for aligning the center of an X-ray beam with both a reference point on a patient and the center of the X-ray film holder. An X-ray collimator is provided with a visible light source and two fan beam assemblies which provide two fan beam planes. The fan beam planes perpendicularly bisect the X-ray beam and each other to form a line of intersection corresponding to the center of the X-ray beam. The intersecting fan beam planes form a cross-hair reticle whose origin point of intersection lies on the center of the X-ray beam. The cross-hair reticle is directed toward a patient for positioning the patient with respect to the X-ray beam. For purposes of aligning the X-ray beam, the cross-hair reticle may be aimed at an opaque object located at the center of the X-ray film holder. In this way, both the center of the X-ray film holder and the point of intersection of the cross-hair reticle are in alignment with the center of the X-ray beam. The preferred light source is a laser beam forming a laser reticle. A single source may be used to provide two fan beam planes; or two separate laser sources may be used. The width of the fan beams emerging from the apparatus of the invention is controlled by beam diaphragms in order to confine the cross-hair reticle to the surface of the patient.
REFERENCES:
patent: 3909616 (1975-09-01), Redfield et al.
patent: 4242587 (1980-12-01), Lescrenier
patent: 4356400 (1982-10-01), Polizzi et al.
Gaskill, J. D., Linear Systems, Fourier Transforms, and Optics, Wiley, 1978, pp. 479-484.
Grigsby T. N.
Smith Alfred E.
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