X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1996-06-28
1998-03-03
Porta, David P.
X-ray or gamma ray systems or devices
Beam control
Collimator
378 65, 2504921, G21F 504
Patent
active
057244030
ABSTRACT:
In a radiation emitting device, particularly in a radiation treatment device (2), the actual radiation delivered to an object (13) via a radiation beam (1) is adjusted to match the field to be irradiated on object (13). Jaws (250, 252, 254, 256) are arranged between a radiation source and an object (13) to provide an opening (110). The field is divided up into sections, and wedge corrections and/or monotonic functions are calculated for each of the sections. The wedge corrections and/or monotonic functions are used to deliver radiation to each of the sections in the field. Jaws (250, 252, 254, 256) and the radiation dose are controlled during the treatment of each of the sections.
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Peter K. Kijewski et al., "Wedge-Shaped Dose Distributions by Computer-Controlled Collimator Motion", pp. 426-429, vol. 5, No. 5, Sep./Oct. 1978.
Lee M. Chin et al., "Dose Optimization With Computer-Controlled Gantry Rotation, Collimator Motion and Dose-Rate Variation", pp. 723-729, vol. 9, Dec. 1982.
Hernandez-Guerra Francisco Miguel
Siochi Ramon Alfredo Carvalho
Porta David P.
Siemens Medical Systems Inc.
Vance Heather S.
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