Experimental evaluation of the accuracy of skin dose calculation for a commercial treatment planning system

Laurence E. Court*, Roy B. Tishler, Aaron M. Allen, Hong Xiang, Mike Makrigiorgos, Lee Chin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The present work uses the Eclipse treatment planning system (TPS) to investigate the accuracy of skin dose calculations. Micro-MOSFETs (metal oxide semiconductor field effect transistors) were used to measure skin dose for a range of irradiation conditions (open fields, physical wedges, dynamic wedges, various source-to-surface distances) for 6-MV and 10-MV beams, and the results were compared with the calculated mean dose to a "skin" structure 2 mm thick for semi-cylindrical phantoms (representative of a neck or breast). Agreement between the calculated and measured skin dose values was better than ±20% for 95% of all measured points (6-MV and 10-MV X-ray spectra alike). For a fixed geometry, the TPS correctly calculated relative changes in dose, showing that minimization of skin dose in intensity-modulated radiation therapy will be effective in Eclipse.

Original languageEnglish
Pages (from-to)29-35
Number of pages7
JournalJournal of Applied Clinical Medical Physics
Volume9
Issue number1
DOIs
StatePublished - 2008
Externally publishedYes

Keywords

  • Dose calculations
  • MOSFET
  • Skin dose

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