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Fluorescent screen video imaging for checking linac beams in dynamic stereotactic radiosurgery
Author(s) -
Lightstone A. W.,
Ramani R.,
O'Brien P. F.,
Gillies B. A.
Publication year - 1994
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 - 10.1118/1.597184
Subject(s) - isocenter , radiosurgery , linear particle accelerator , quality assurance , optics , nuclear medicine , beam (structure) , medical imaging , dosimetry , medical physics , physics , computer science , imaging phantom , medicine , radiology , artificial intelligence , radiation therapy , external quality assessment , pathology
Precise beam targeting is crucial to stereotactic radiosurgery. A monitoring system is described consisting of a fluorescent screen, video camera, and computer interface. Approximately ten frames are analyzed each second, verifying the beam intensity, uniformity, position, and diameter. When mounted on the gantry, the system can indicate the dynamic isocenter position using the “ball test” technique. The fluorescent screen video indicates that the 6‐MV beam used for radiosurgery at our facility is acceptably stable; moreover, the small isocenter shift versus gantry and couch angles is reasonably reproducible. At our facility, quality assurance tests with this apparatus are performed every month.