Quantification of the skin sparing effect achievable with high-energy photon beams when carbon fiber tables are used

Ivaylo B. Mihaylov, Jose Penagaricano, Eduardo G. Moros

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Purpose: To quantify the skin doses resulting from the use of carbon fiber couches (CFCs) for patient support. Materials and methods: BrainLab's CFC was evaluated for five prostate patients and five lung patients. For each patient PTV, organs at risk (OARs), and a 0.3 cm thick skin contour on the patient's posterior surface were outlined. Two sets of IMRT plans, each consisting of 4, 5, 7, and 9 beams, were generated per patient. The sets were identical with the exception that in the first set only 6 MV energy was used, while in the second set (mixed energy) the photon energy of the beams traversing the CFC was 18 MV. The plans for each patient were normalized to deliver the same dose to 95% of the PTV. The CFC skin dose was evaluated by the maximum dose received by 1% (D1%) of the skin volume. Paired one-tailed t-tests were used to establish the statistical significance. Results: The mixed energy plans resulted in D1% increase from 18% to more than 23% as the number of beams in the plan was decreased from 9 to 4. Conclusions: Skin doses as high as ∼70% of the prescription dose were found even in 9-beam mixed energy plans. Therefore mixed energy plans may be more beneficial for patients treated with higher fractional doses.

Original languageEnglish (US)
Pages (from-to)147-152
Number of pages6
JournalRadiotherapy and Oncology
Volume93
Issue number1
DOIs
StatePublished - Oct 1 2009
Externally publishedYes

Keywords

  • Carbon fiber
  • Couch
  • Dose
  • IMRT
  • Skin dose

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Radiology Nuclear Medicine and imaging

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