DOSIMETRIC CHARACTERIZATION OF AN ACCESSORY MOUNTED MINI-BEAM COLLIMATOR ACROSS MULTIPLE CLINICALLY BEAM-MATCHED MEDICAL LINEAR ACCELERATORS


41th Annual CNS-CNA Student Conference - 2017 June 05

Presented at:
41th Annual CNS-CNA Student Conference
2017 June 05
Location:
Niagara Falls, ON Canada
Session Title:
Student Posters, Wine-&-Cheese Reception

Authors:
W. Davis (University of Saskatchewan)
G. Cranmer-Sargison (Saskatchewan Cancer Agency/University of Saskatchewan)
C. Rangacharyulu (University of Saskatchewan)
A. Alexander (Saskatchewan Cancer Agency/University of Saskatchewan)
V. Kundapur (Saskatchewan Cancer Agency/University of Saskatchewan)
  

Abstract

A mini-beam collimator has been dosimetrically characterized on three clinically beam matched medical linear accelerators. Beam quality (%DD(10)), peak-to-valley dose ratio (PVDR), collimator factor (CF), and relative output (OF) were obtained for 6 MV mini-beam collimated fields of various sizes on three Varian iX medical linear accelerators. Though the beam quality remained constant, discrepancies in PVDR, CF, and OF were observed across accelerators. Monte Carlo simulations of the mini-beam collimated fields revealed that these differences were related to the linac electron beam width

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