Method and system for dynamically establishing field size...

Details Method and system for dynamically establishing field size... Method and system for dynamically establishing field size...

A - Human Necessities

61

N

A61N 5/10 (2006.01) H05G 1/02 (2006.01)

Patent

CA 2212707

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.

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