Risk of a second cancer from scattered radiation in acoustic neuroma treatment

Myonggeun Yoon, Hyunho Lee, Jiwon Sung, Dongoh Shin, Sungho Park, Weon Kuu Chung, Geon Ho Jahng, Dong Wook Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The present study aimed to compare the risk of a secondary cancer from scattered and leakage doses in patients receiving intensity-modulated radiotherapy (IMRT), volumetric modulated arc therapy (VMAT), and stereotactic radiosurgery (SRS). Four acoustic neuroma patients were treated with IMRT, VMAT, or SRS. Their excess relative risk (ERR), excess absolute risk (EAR), and lifetime attributable risk (LAR) of a secondary cancer were estimated using the corresponding secondary doses measured at various organs by using radio-photoluminescence glass dosimeters (RPLGD) placed inside a humanoid phantom. When a prescription dose was delivered in the planning target volume of the 4 patients, the average organ equivalent doses (OED) at the thyroid, lung, liver, bowel, bladder, prostate (or ovary), and rectum were 14.6, 1.7, 0.9, 0.8, 0.6, 0.6, and 0.6 cGy, respectively, for IMRT whereas they were 19.1, 1.8, 2.0, 0.6, 0.4, 0.4, and 0.4 cGy, respectively, for VMAT, and 22.8, 4.6, 1.4, 0.7, 0.5, 0.5, and 0.5 cGy, respectively, for SRS. The OED decreased as the distance from the primary beam increased. The thyroid received the highest OED compared to other organs. A lifetime attributable risk evaluation estimated that more than 0.03% of acoustic neuroma (AN) patients would get radiation-induced cancer within 20 years of receiving radiation therapy. The organ with the highest radiation-induced cancer risk after radiation treatment for AN was the thyroid. We found that the LAR could be increased by the transmitted dose from the primary beam. No modality-specific difference in radiation-induced cancer risk was observed in our study.

Original languageEnglish
Pages (from-to)1919-1927
Number of pages9
JournalJournal of the Korean Physical Society
Issue number12
Publication statusPublished - 2014

Bibliographical note

Funding Information:
This work was supported by the General Researcher Program (NRF-2012R1A1A2003174), the Nuclear Safety Research Program (Grant No. 1305033) through the Korea Radiation Safety Foundation (KO-RSAFe) and the Nuclear Safety and Security Commission (NSSC), the Radiation Safety Program (2011-31115), and Radiation Technology Development Program (2013M2A2A4027117), Republic of Korea.


  • Acoustic neuroma
  • EAR
  • ERR
  • IMRT
  • OED
  • SRS
  • Secondary dose
  • VMAT

ASJC Scopus subject areas

  • General Physics and Astronomy


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