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Dose distributions in dynamic stereotactic radiosurgery
Author(s) -
Pike Bruce,
Podgorsak Ervin B.,
Peters Terence M.,
Pla Conrado
Publication year - 1987
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 - 10.1118/1.596003
Subject(s) - radiosurgery , sagittal plane , radiation treatment planning , nuclear medicine , transverse plane , rotation (mathematics) , linear particle accelerator , dosimetry , isocenter , coronal plane , medical imaging , imaging phantom , physics , beam (structure) , computer science , radiation therapy , medicine , optics , radiology , computer vision
A treatment planning technique for calculation of dose distributions in dynamic stereotactic “radiosurgery” with a 10‐MV isocentrically mounted linear accelerator is presented. The treatment planning for dynamic radiosurgery is a three‐dimensional problem, since during treatment both the gantry and the couch rotate simultaneously, the gantry from 30° to 330° and the couch from 75° to −75°. The patient surface and anatomical information is obtained from a family of computed tomography or magnetic resonance scans, and a stereotactic frame is used for target localization, treatment setup, and patient immobilization during the treatment. The dose calculational algorithm follows the gantry and couch rotation in an incremental fashion, and relies on measured stationary beam central axis percentage depth doses and dose profiles to calculate the normalized tissue‐maximum‐ratio distributions over a matrix of points defined on one of three orthogonal planes (transverse, sagittal, or coronal). The dose calculation algorithm is discussed in detail and calculated dose distributions for single plane and dynamic radiosurgery compared with measured data.