X-ray or gamma ray systems or devices – Accessory – Alignment
Patent
1996-08-12
1997-11-04
Porta, David P.
X-ray or gamma ray systems or devices
Accessory
Alignment
378157, 378207, A61B 608
Patent
active
056848544
ABSTRACT:
A method of establishing coincidence between a field size of a light field used in a setup mode of a radiation system and a field size of a radiation field used in an operation mode of the system includes providing automatic adjustment of field-defining structure to compensate for differences in optical properties of the light and the radiation. A light beam passing through the field-defining structure typically exhibits greater scattering than an X-ray beam passing through the structure. For each of a number of different settings of the field-defining structure, the difference between the field sizes of the light and the radiation are determined and recorded. Then, for a particular desired field size, the field-defining structure can be automatically adjusted to provide compensation. In the preferred embodiment, the field-defining structure includes jaws of a collimator of a radiation system and the determination of field size differences of the light and the radiation occurs for each of various energy level settings of the radiation system.
REFERENCES:
patent: 3921001 (1975-11-01), Edholm et al.
patent: 3947689 (1976-03-01), Wagner
patent: 5446548 (1995-08-01), Gerig et al.
patent: 5563924 (1996-10-01), Winkelmann
Porta David P.
Siemens Medical System Inc
Vance Heather S.
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