Open Access“Characterization of ELEKTA SRS cone collimator using high spatial resolution monolithic silicon detector array”
Author(s) -
Shukaili Khalsa Al,
Corde Stéphanie,
Petasecca Marco,
Pereveratylo Vladimir,
Lerch Michael,
Jackson Michael,
Rosenfeld Anatoly
Publication year - 2018
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1002/acm2.12345
Subject(s) - collimator , detector , dosimetry , optics , materials science , diode , full width at half maximum , image resolution , nuclear medicine , physics , optoelectronics , medicine
Purpose To investigate the accuracy of the dosimetry of radiation fields produced by small ELEKTA cone collimators used for stereotactic radiosurgery treatments ( SRS ) using commercially available detectors EBT 3 Gafchromic TM film, IBA Stereotactic diode ( SFD ), and the recently developed detector DUO , which is a monolithic silicon orthogonal linear diode array detector. Methods These three detectors were used for the measurement of beam profiles, output factors, and percentage depth dose for SRS cone collimators with cone sizes ranging from 5 to 50 mm diameter. The measurements were performed at 10 cm depth and 90 cm SSD . Results The SRS cone beam profiles measured with DUO , EBT 3 film, and IBA SFD agreed well, results being in agreement within ±0.5 mm in the FWHM , and ±0.7 mm in the penumbra region. The output factor measured by DUO with 0.5 mm air gap above agrees within ±1% with EBT 3. The OF measured by IBA SFD (corrected for the over‐response) agreed with both EBT 3 and DUO within ±2%. All three detectors agree within ±2% for PDD measurements for all SRS cones. Conclusions The characteristics of the ELEKTA SRS cone collimator have been evaluated by using a monolithic silicon high spatial resolution detector DUO , EBT 3, and IBA SFD diode. The DUO detector is suitable for fast real‐time quality assurance dosimetry in small radiation fields typical for SRS / SRT . This has been demonstrated by its good agreement of measured doses with EBT 3 films.