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Title: Treatment of extensive scalp lesions with segmental intensity-modulated photon therapy

Abstract

Purpose: To compare static electron therapy, electron arc therapy, and photon intensity-modulated radiation therapy (IMRT) for treatment of extensive scalp lesions and to examine the dosimetric accuracy of the techniques. Methods and Materials: A retrospective treatment-planning study was performed to evaluate the relative merits of static electron fields, arcing electron fields, and five-field photon IMRT. Thermoluminescent dosimeters (TLD) were used to verify the accuracy of the techniques. The required thickness of bolus was investigated, and an anthropomorphic phantom was also used to examine the effects of air gaps between the wax bolus used for the IMRT technique and the patient's scalp. Results: Neither static nor arcing electron techniques were able to provide a reliable coverage of the planning target volume (PTV), owing to obliquity of the fields in relation to the scalp. The IMRT technique considerably improved PTV dose uniformity, though it irradiated a larger volume of brain. Either 0.5 cm or 1.0 cm of wax bolus was found to be suitable. Air gaps of up to 1 cm between the bolus and the patient's scalp were correctly handled by the treatment-planning system and had negligible influence on the dose to the scalp. Conclusions: Photon IMRT provides a feasible alternativemore » to electron techniques for treatment of large scalp lesions, resulting in improved homogeneity of dose to the PTV but with a moderate increase in dose to the brain.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [3]
  1. Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Foundation Trust, Sutton, Surrey (United Kingdom)
  2. Joint Department of Physics, The Institute of Cancer Research and Royal Marsden NHS Foundation Trust, Sutton, Surrey (United Kingdom)
  3. Department of Radiotherapy, Institute of Cancer Research and Royal Marsden NHS Foundation Trust, Sutton, Surrey (United Kingdom)
Publication Date:
OSTI Identifier:
20698518
Resource Type:
Journal Article
Journal Name:
International Journal of Radiation Oncology, Biology and Physics
Additional Journal Information:
Journal Volume: 62; Journal Issue: 5; Other Information: DOI: 10.1016/j.ijrobp.2005.04.001; PII: S0360-3016(05)00600-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0360-3016
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ACCURACY; BRAIN; ELECTRON BEAMS; IRRADIATION; PATIENTS; PHANTOMS; PHOTON BEAMS; PLANNING; RADIATION DOSES; RADIOTHERAPY; THERMOLUMINESCENT DOSEMETERS; THICKNESS

Citation Formats

Bedford, James L, Childs, Peter J, Hansen, Vibeke Nordmark, Warrington, Alan P, Mendes, Ruheena L, and Glees, John P. Treatment of extensive scalp lesions with segmental intensity-modulated photon therapy. United States: N. p., 2005. Web. doi:10.1016/j.ijrobp.2005.04.001.
Bedford, James L, Childs, Peter J, Hansen, Vibeke Nordmark, Warrington, Alan P, Mendes, Ruheena L, & Glees, John P. Treatment of extensive scalp lesions with segmental intensity-modulated photon therapy. United States. https://doi.org/10.1016/j.ijrobp.2005.04.001
Bedford, James L, Childs, Peter J, Hansen, Vibeke Nordmark, Warrington, Alan P, Mendes, Ruheena L, and Glees, John P. 2005. "Treatment of extensive scalp lesions with segmental intensity-modulated photon therapy". United States. https://doi.org/10.1016/j.ijrobp.2005.04.001.
@article{osti_20698518,
title = {Treatment of extensive scalp lesions with segmental intensity-modulated photon therapy},
author = {Bedford, James L and Childs, Peter J and Hansen, Vibeke Nordmark and Warrington, Alan P and Mendes, Ruheena L and Glees, John P},
abstractNote = {Purpose: To compare static electron therapy, electron arc therapy, and photon intensity-modulated radiation therapy (IMRT) for treatment of extensive scalp lesions and to examine the dosimetric accuracy of the techniques. Methods and Materials: A retrospective treatment-planning study was performed to evaluate the relative merits of static electron fields, arcing electron fields, and five-field photon IMRT. Thermoluminescent dosimeters (TLD) were used to verify the accuracy of the techniques. The required thickness of bolus was investigated, and an anthropomorphic phantom was also used to examine the effects of air gaps between the wax bolus used for the IMRT technique and the patient's scalp. Results: Neither static nor arcing electron techniques were able to provide a reliable coverage of the planning target volume (PTV), owing to obliquity of the fields in relation to the scalp. The IMRT technique considerably improved PTV dose uniformity, though it irradiated a larger volume of brain. Either 0.5 cm or 1.0 cm of wax bolus was found to be suitable. Air gaps of up to 1 cm between the bolus and the patient's scalp were correctly handled by the treatment-planning system and had negligible influence on the dose to the scalp. Conclusions: Photon IMRT provides a feasible alternative to electron techniques for treatment of large scalp lesions, resulting in improved homogeneity of dose to the PTV but with a moderate increase in dose to the brain.},
doi = {10.1016/j.ijrobp.2005.04.001},
url = {https://www.osti.gov/biblio/20698518}, journal = {International Journal of Radiation Oncology, Biology and Physics},
issn = {0360-3016},
number = 5,
volume = 62,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2005},
month = {Mon Aug 01 00:00:00 EDT 2005}
}