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Title: Is there a clinical benefit with a smooth compensator design compared with a plunged compensator design for passive scattered protons?

In proton therapy, passive scattered proton plans use compensators to conform the dose to the distal surface of the planning volume. These devices are custom made from acrylic or wax for each treatment field using either a plunge-drilled or smooth-milled compensator design. The purpose of this study was to investigate if there is a clinical benefit of generating passive scattered proton radiation treatment plans with the smooth compensator design. We generated 4 plans with different techniques using the smooth compensators. We chose 5 sites and 5 patients for each site for the range of dosimetric effects to show adequate sample. The plans were compared and evaluated using multicriteria (MCA) plan quality metrics for plan assessment and comparison using the Quality Reports [EMR] technology by Canis Lupus LLC. The average absolute difference for dosimetric metrics from the plunged-depth plan ranged from −4.7 to +3.0 and the average absolute performance results ranged from −6.6% to +3%. The manually edited smooth compensator plan yielded the best dosimetric metric, +3.0, and performance, + 3.0% compared to the plunged-depth plan. It was also superior to the other smooth compensator plans. Our results indicate that there are multiple approaches to achieve plans with smooth compensators similarmore » to the plunged-depth plans. The smooth compensators with manual compensator edits yielded equal or better target coverage and normal tissue (NT) doses compared with the other smooth compensator techniques. Further studies are under investigation to evaluate the robustness of the smooth compensator design.« less
Authors:
 [1] ; ; ; ;  [1] ;  [2] ; ; ; ;  [3] ;  [4] ; ;  [5] ;  [2]
  1. University of Texas School of Allied Health-Medical Dosimetry, Houston, TX (United States)
  2. MD Anderson Department of Radiation Oncology, Houston, TX (United States)
  3. MD Anderson Department of Radiation Physics, Houston, TX (United States)
  4. Radiation Oncology Resources, Goshen, IN (United States)
  5. Decimal, Inc, Sanford, FL (United States)
Publication Date:
OSTI Identifier:
22462422
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Dosimetry; Journal Volume: 40; Journal Issue: 1; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; ANIMAL TISSUES; COMPARATIVE EVALUATIONS; DEPTH; DESIGN; PATIENTS; PLANNING; PROTON BEAMS; PROTONS; RADIATION DOSES; RADIOTHERAPY; YIELDS