Dosimetric study of whole-brain irradiation with high-energy photon beams for dose reduction to the scalp

Masafumi Sawada, Etsuo Kunieda, Takeshi Akiba, Shigeto Kabuki, Ryuta Nagao, Tsuyoshi Fukuzawa, Yoshitsugu Matsumoto, Naoyuki Shigematsu

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE: To evaluate the efficiency of high-energy photons for mitigating alopecia due to whole-brain irradiation (WBRT). METHODS: Planning CT data from 10 patients who received WBRT were collected. We prepared 4 WBRT plans that used 6 or 15 MV photon beams, with or without use of a field-in-field (FiF) technique, and compared outcomes using a treatment planning system. The primary outcome was dose parameters to the scalp, including the mean dose, maximum dose, and dose received to 50% scalp(D50%). Secondary outcomes were minimum dose to the brain surface. RESULTS: Using FiF, the mean doses were 24.4-26.0 and 22.4-24.1 Gy, and the maximum doses were 30.5-32.1 and 28.5-30.8 Gy for 6 and 15 MV photon beams, respectively. Without FiF, the mean doses were 24.6-26.9 and 22.6-24.5 Gy, and the maximum doses were 30.8-34.6 and 28.6-32.4 Gy for 6 and 15 MV photon beams. The 15 MV plan resulted in a lower scalp dose for each dose parameter (p < 0.001). Using FiF, the minimum doses to the brain surface for the 6 and 15 MV plans were 28.9 ± 0.440 and 29.0 ± 0.557 Gy, respectively (p = 0.70). Without FiF, the minimum doses to the brain surface for the 6 and 15 MV plans were 28.9 ± 0.456 and 29.0 ± 0.529, respectively (p = 0.66). CONCLUSION: Compared with the 6 MV plan, the 15 MV plan achieved a lower scalp dose without impairing the brain surface dose. ADVANCES IN KNOWLEDGE: High-energy photon WBRT may mitigate alopecia of patients who receiving WBRT.

Original languageEnglish
Pages (from-to)20200159
Number of pages1
JournalBritish Journal of Radiology
Volume93
Issue number1114
DOIs
Publication statusPublished - 2020 Oct 1

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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