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Evaluation of a Monte Carlo-based algorithm for the influence of totally implantable venous access ports in external radiation therapy

Authors
  • Takeshita, Toshiki1, 2
  • Magome, Taiki3
  • Watanabe, Ryuji1
  • Onozawa, Shiro1
  • Tsuchiya, Konatsu4
  • Tago, Masao1
  • Sasaki, Masayuki2
  • 1 Teikyo University School of Medicine Mizonokuchi Hospital, 5-1-1 Futago Takatsu-ku, Kawasaki, Kanagawa, 213-8507, Japan , Kawasaki (Japan)
  • 2 Kyushu University Graduate School of Medical Sciences School of Medicine, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan , Fukuoka (Japan)
  • 3 Komazawa University Faculty of Health Sciences Graduate School of Health Sciences, Tokyo, Japan , Tokyo (Japan)
  • 4 Tokyo Radiation Oncology Clinic, Tokyo, Japan , Tokyo (Japan)
Type
Published Article
Journal
Japanese Journal of Radiology
Publisher
Springer Singapore
Publication Date
Nov 02, 2020
Volume
39
Issue
4
Pages
387–394
Identifiers
DOI: 10.1007/s11604-020-01062-9
Source
Springer Nature
Keywords
License
Yellow

Abstract

PurposeThis study aimed to assess whether a Monte Carlo (MC)-based algorithm reflects the influence of totally implantable venous access ports (TIVAPs) in external radiation therapy.Materials and MethodsThe present study comprised two steps: experimental measurements of depth doses and surface doses with and without TIVAPs and calculation with an MC-based algorithm.ResultsThe TIVAP-associated maximum dose reduction compared with the dose at the same depths without TIVAPs was 7.8% at 4 MV, 6.9% at 6 MV, and 5.7% at 10 MV in measurement, and 7.4% at 4 MV, 6.6% at 6 MV, and 5.5% at 10 MV in calculation. Relative surface doses were higher with TIVAPs made of titanium, due to a higher fluence of backscattered electrons from the TIVAPs, than with plastic TIVAPs. There were no significant differences in the relative differences between the measured and calculated doses of the titanium TIVAP group and the plastic TIVAP group at 4 MV (p = 0.99), 6 MV (p = 0.67), and 10 MV (p = 0.54).ConclusionTIVAPs caused target dose reductions and dose increase near the TIVAP, especially when made of titanium. The influences are reflected in the MC-based algorithm.

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