Influence of beam efficiency through the patient-specific collimator on secondary neutron dose equivalent in double scattering and uniform scanning modes of proton therapy

Medical Physics
D HeckselK Shahnazi

Abstract

Conventional proton therapy facilities use double scattering nozzles, which are optimized for delivery of a few fixed field sizes. Similarly, uniform scanning nozzles are commissioned for a limited number of field sizes. However, cases invariably occur where the treatment field is significantly different from these fixed field sizes. The purpose of this work was to determine the impact of the radiation field conformity to the patient-specific collimator on the secondary neutron dose equivalent. Using a WENDI-II neutron detector, the authors experimentally investigated how the neutron dose equivalent at a particular point of interest varied with different collimator sizes, while the beam spreading was kept constant. The measurements were performed for different modes of dose delivery in proton therapy, all of which are available at the Midwest Proton Radiotherapy Institute (MPRI): Double scattering, uniform scanning delivering rectangular fields, and uniform scanning delivering circular fields. The authors also studied how the neutron dose equivalent changes when one changes the amplitudes of the scanned field for a fixed collimator size. The secondary neutron dose equivalent was found to decrease linearly with the collimator ar...Continue Reading

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Citations

Mar 28, 2016·Practical Radiation Oncology·Liane Y EmersonSalma K Jabbour
Nov 26, 2010·Physics in Medicine and Biology·V Anferov
Feb 19, 2020·La Radiologia medica·Ramon Gimenez De LorenzoMaria Daniela Falco
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May 28, 2019·Medical Physics·Bijan ArjomandyYuki Kase
Oct 30, 2012·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Michael S GossmanJeffrey A Larose

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