Journal
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Volume 48, Issue 3, Pages 924-928Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/23.940133
Keywords
dosimetry; optical fibers; photodetector; scintillator; stereotactic radiosurgery
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Linear accelerator-based stereotactic radiosurgery is an important modality in the management of localized intracranial abnormalities and often is the only option for treatment of certain lesions. The quantification of the absorbed radiation doses delivered for this modality has been a challenge due to the small size of the treatment fields (typically 5-30 min collimated fields) and the type of detectors presently available. This paper presents comparative dose measurements performed using a miniature (1.6 x 10(-3) cm(3)) plastic scintillator detector to the commonly used detectors for the dosimetry of small photon fields used for stereotactic radiosurgery. The spatial resolution of the plastic scintillator detector was compared to that of a p-type Si diode and a 0.1-cm(3) ionization chamber. Small field dosimetry parameters (beam profiles, percent depth doses, and dose output factors) using the scintillation detector, the 0.1-cm(3) ionization chamber, the p-type Si diode, and radiographic film are presented. This comparative study shows that designing a miniature scintillator detector system is feasible and when compared to other benchmark detectors is an appropriate detector for the dosimetry of small stereotactic radiosurgery photon fields.
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