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


  • CBCT
  • IGRT
  • Secondary cancer risk
  • Shielding

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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