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Dosimetric effect of limited aperture multileaf collimator on VMAT plan quality: A study of prostate and head-and-neck cancers

The aim of study was to evaluate the dosimetric effect of collimator-rotation on VMAT plan quality, when using limited aperture multileaf collimator of Elekta Beam Modulator™ providing a maximum aperture of 21 cm × 16 cm. The increased use of VMAT technique to deliver IMRT from conventional to very... Full description

Journal Title: Reports of Practical Oncology & Radiotherapy May 2018, Vol.23(3), pp.189-198
Main Author: Murtaza, Ghulam
Other Authors: Mehmood, Shahid , Rasul, Shahid , Murtaza, Imran , Khan, Ehsan Ullah
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 1507-1367 ; DOI: 10.1016/j.rpor.2018.02.006
Link: https://www.sciencedirect.com/science/article/pii/S1507136718300269
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recordid: elsevier_sdoi_10_1016_j_rpor_2018_02_006
title: Dosimetric effect of limited aperture multileaf collimator on VMAT plan quality: A study of prostate and head-and-neck cancers
format: Article
creator:
  • Murtaza, Ghulam
  • Mehmood, Shahid
  • Rasul, Shahid
  • Murtaza, Imran
  • Khan, Ehsan Ullah
subjects:
  • Vmat
  • Treatment Planning
  • Collimator Rotation
  • Limited Aperture Mlc
  • Medicine
ispartof: Reports of Practical Oncology & Radiotherapy, May 2018, Vol.23(3), pp.189-198
description: The aim of study was to evaluate the dosimetric effect of collimator-rotation on VMAT plan quality, when using limited aperture multileaf collimator of Elekta Beam Modulator™ providing a maximum aperture of 21 cm × 16 cm. The increased use of VMAT technique to deliver IMRT from conventional to very specialized treatments present a challenge in plan optimization. In this study VMAT plans were optimized for prostate and head and neck cancers using Elekta Beam-Modulator , whereas previous studies were reported for conventional Linac aperture. VMAT plans for nine of each prostate and head-and-neck cancer patients were produced using the 6 MV photon beam for Elekta-SynergyS Linac using Pinnacle treatment planning system. Single arc, dual arc and two combined independent-single arcs were optimized for collimator angles (C) 0°, 90° and 0°–90° (0°–90°; i.e. the first-arc was assigned C0° and second-arc was assigned C90°). A treatment plan comparison was performed among C0°, C90° and C(0°–90°) for single-arc dual-arc and two independent-single-arcs VMAT techniques to evaluate the influence of extreme collimator rotations (C0° and 90°) on VMAT plan quality. Plan evaluation criteria included the target coverage, conformity index, homogeneity index and doses to organs at risk. A ‘two-sided student -test’ ( ≤ 0.05) was used to determine if there was a significant difference in dose volume indices of plans. For both prostate and head-and-neck, plan quality at collimator angles C0° and C(0°–90°) was clinically acceptable for all VMAT-techniques, except SA for head-and-neck. Poorer target coverage, higher normal tissue doses and significant -values were observed for collimator angle 90° when compared with C0° and C(0°–90°). A collimator rotation of 0° provided significantly better target coverage and sparing of organs-at-risk than a collimator rotation of 90° for all VMAT techniques.
language: eng
source:
identifier: ISSN: 1507-1367 ; DOI: 10.1016/j.rpor.2018.02.006
fulltext: fulltext
issn:
  • 1507-1367
  • 15071367
url: Link


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titleDosimetric effect of limited aperture multileaf collimator on VMAT plan quality: A study of prostate and head-and-neck cancers
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ispartofReports of Practical Oncology & Radiotherapy, May 2018, Vol.23(3), pp.189-198
identifierISSN: 1507-1367 ; DOI: 10.1016/j.rpor.2018.02.006
subjectVmat ; Treatment Planning ; Collimator Rotation ; Limited Aperture Mlc ; Medicine
descriptionThe aim of study was to evaluate the dosimetric effect of collimator-rotation on VMAT plan quality, when using limited aperture multileaf collimator of Elekta Beam Modulator™ providing a maximum aperture of 21 cm × 16 cm. The increased use of VMAT technique to deliver IMRT from conventional to very specialized treatments present a challenge in plan optimization. In this study VMAT plans were optimized for prostate and head and neck cancers using Elekta Beam-Modulator , whereas previous studies were reported for conventional Linac aperture. VMAT plans for nine of each prostate and head-and-neck cancer patients were produced using the 6 MV photon beam for Elekta-SynergyS Linac using Pinnacle treatment planning system. Single arc, dual arc and two combined independent-single arcs were optimized for collimator angles (C) 0°, 90° and 0°–90° (0°–90°; i.e. the first-arc was assigned C0° and second-arc was assigned C90°). A treatment plan comparison was performed among C0°, C90° and C(0°–90°) for single-arc dual-arc and two independent-single-arcs VMAT techniques to evaluate the influence of extreme collimator rotations (C0° and 90°) on VMAT plan quality. Plan evaluation criteria included the target coverage, conformity index, homogeneity index and doses to organs at risk. A ‘two-sided student -test’ ( ≤ 0.05) was used to determine if there was a significant difference in dose volume indices of plans. For both prostate and head-and-neck, plan quality at collimator angles C0° and C(0°–90°) was clinically acceptable for all VMAT-techniques, except SA for head-and-neck. Poorer target coverage, higher normal tissue doses and significant -values were observed for collimator angle 90° when compared with C0° and C(0°–90°). A collimator rotation of 0° provided significantly better target coverage and sparing of organs-at-risk than a collimator rotation of 90° for all VMAT techniques.
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