Estimate of the shielding effect on secondary cancer risk due to cone-beam CT in image-guided radiotherapy

Jiwon Sung, Tae Seong Baek, Myonggeun Yoon, Dong Wook Kim, Dong Hyun Kim

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1 Citation (Scopus)


This study evaluated the effect of a simple shielding method using a thin lead sheet on the imaging dose caused by cone-beam computed tomography (CBCT) in image-guided radiation therapy (IGRT). Reduction of secondary doses from CBCT was measured using a radio-photoluminescence glass dosimeter (RPLGD) placed inside an anthropomorphic phantom. The entire body, except for the region scanned by using CBCT, was shielded by wrapping it with a 2-mm lead sheet. Changes in secondary cancer risk due to shielding were calculated using BEIR VII models. Doses to out-of-field organs for head-and-neck, chest, and pelvis scans were decreased 15 ~ 100%, 23 ~ 90%, and 23 ~ 98%, respectively, and the average reductions in lifetime secondary cancer risk due to the 2-mm lead shielding were 1.6, 11.5, and 12.7 persons per 100,000, respectively. These findings suggest that a simple, thin-lead-sheet-based shielding method can effectively decrease secondary doses to out-of-field regions for CBCT, which reduces the lifetime cancer risk on average by 9 per 100,000 patients.

Original languageEnglish
Pages (from-to)757-762
Number of pages6
JournalJournal of the Korean Physical Society
Issue number5
Publication statusPublished - 2014 Sept 1

Bibliographical note

Funding Information:
This work was supported by the Nuclear Safety Research Program through the Korea Radiation Safety Foundation (KORSAFe) and the Nuclear Safety and Security Commission (NSSC), Republic of Korea (Grant No. 1305033), and by the National Nuclear R&D Program, Republic of Korea (Grant No. 1103001) and by a Korea University grant (K1200521) and by an Institute of Health Science grant, Korea University.

Publisher Copyright:
© 2014, The Korean Physical Society.


  • CBCT
  • IGRT
  • Secondary cancer risk
  • Shielding

ASJC Scopus subject areas

  • General Physics and Astronomy


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