Two-dimensional mapping of underdosed areas using radiochromic film for patients undergoing total skin electron beam radiotherapy
- Department of Medical Physics, Juravinski Cancer Centre, Hamilton, ON (Canada)
- Department of Radiation Oncology, Peel Regional Cancer Program, Mississauga, ON (Canada)
- Department of Medical Physics, Juravinski Cancer Centre, Hamilton, ON (Canada) and Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, ON (Canada) and Department of Radiology, McMaster University, Hamilton, ON (Canada)
Purpose: To demonstrate the viability of radiochromic film as an in vivo, two-dimensional dosimeter for the measurement of underdosed areas in patients undergoing total skin electron beam (TSEB) radiotherapy. The results were compared with thermoluminescent dosimeter measurements. Methods and Materials: Dosimetry results are reported for an inframammary fold of 2 patients treated using a modified version of the Stanford six-position (i.e., six-field and dual-beam) TSEB technique. The results are presented as contour plots of film optical density and percentage of dose. A linear dose profile measured from film was compared with the thermoluminescent dosimeter measurements. Results: The results showed that the percentage doses as measured by film are in good agreement with those measured by the thermoluminescent dosimeters. The isodose contour plots provided by film can be used as a two-dimensional dose map for a patient when determining the size of the supplemental patch fields. Conclusion: Radiochromic film is a viable dosimetry tool that the radiation oncologist can use to understand the surface dose heterogeneity better across complex concave regions of skin to help establish more appropriate margins to patch underdosed areas. Film could be used for patients undergoing TSEB for disorders such as mycosis fungoides or undergoing TSEB or regional skin electron beam for widespread skin metastases from breast cancer and other malignancies.
- OSTI ID:
- 20698597
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 62, Issue 3; Other Information: DOI: 10.1016/j.ijrobp.2005.02.057; PII: S0360-3016(05)00440-2; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
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