Characterization of cylindrical ionization chambers for patient specific IMRT QA.

Journal of Applied Clinical Medical Physics
Danielle FraserJan Seuntjens

Abstract

Proven conventional dosimetry techniques do not provide accuracy and precision in the measurement of inverse planned intensity modulated radiation therapy (IMRT) fields. Dynamic and step-and-shoot multileaf collimation (DMLC/SMLC) challenge current ionization chamber dosimetry practices. Ionization chamber performance in these fields is evaluated for three cylindrical chambers of varying volumes (PinPoint (PP): 0.015 cm3, IC10: 0.13 cm3, Farmer type NE2571 (FT): 0.69 cm3) in terms of measurement reproducibility, dose measurement linearity, and IMRT dose measurements. Fifty IMRT patient specific quality assurance dose measurements were performed with each chamber. DMLC measurements are compared between chambers, and to dose calculations from a commercial treatment planning system (TPS) that used a finite size pencil beam model (FSPB). Ten SMLC measurements are compared to Monte Carlo simulations available in the TPS. The three chambers demonstrated adequate measurement reproducibility characteristics for both open and DMLC fields with each chamber able to perform within 2% (2SD) for DMLC fields. Both smaller volume chambers over responded (> 5%) when irradiated with a small number of monitor units in open fields. FT and IC10 cha...Continue Reading

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Citations

May 26, 2012·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·S A Syam KumarNagarajan Vivekanandan
Feb 14, 2015·Journal of Applied Clinical Medical Physics·Subramani VikramanKataria Tejinder
Jun 4, 2014·Journal of Applied Clinical Medical Physics·Elizabeth M McKenzieStephen F Kry
Jul 7, 2017·Journal of Applied Clinical Medical Physics·Steven T EllefsonJohn E Bayouth
Jul 10, 2014·Radiation Protection Dosimetry·Kwo-Ping ChangYu-Huang Chien
Sep 1, 2019·Journal of Applied Clinical Medical Physics·You ZhangStrahinja Stojadinovic
Jul 12, 2018·Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology·Hediye Acun-BuchtGönül Kemikler

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