Radiosurgery with unflattened 6‐MV photon beams | Zendy

O'Brien P. F. | Zendy; Gillies B. A. | Zendy; Schwartz M. | Zendy; Young C. | Zendy; Davey P. | Zendy

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Radiosurgery with unflattened 6‐MV photon beams

Author(s) -

O'Brien P. F.,

Gillies B. A.,

Schwartz M.,

Young C.,

Davey P.

Publication year - 1991

Publication title -

medical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.473

H-Index - 180

eISSN - 2473-4209

pISSN - 0094-2405

DOI - 10.1118/1.596656

Subject(s) - isocenter , linear particle accelerator , radiosurgery , flatness (cosmology) , field size , dosimetry , dose rate , nuclear medicine , optics , beam (structure) , physics , medical physics , materials science , radiation therapy , medicine , radiology , imaging phantom , cosmology , quantum mechanics

One of the major drawbacks to doing stereotactic radiosurgery with a linear accelerator is the long time required to deliver the target dose. Single fractions of 25 Gy delivered at the isocenter and at depth in the skull may require beam times in excess of 15 min for a typical linear accelerator with a maximum dose rate of 250 cGy/min in tissue. In an effort to decrease the treatment time for this technique, the flattening filter has been removed from an AECL Therac‐6 linear accelerator and the characteristics of the resulting beam have been measured. Flatness is acceptable for the field sizes used with this technique and the dose rate is increased by a factor of 2.75.

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