Estimate of the shielding effect on secondary cancer risk due to cone-beam CT in image-guided radiotherapy
- Authors
- Sung, Jiwon; Baek, Tae Seong; Yoon, Myonggeun; Kim, Dong Wook; Kim, Dong Hyun
- Issue Date
- 9월-2014
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Secondary cancer risk; CBCT; IGRT; BEIR VII; Shielding
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.65, no.5, pp.757 - 762
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 65
- Number
- 5
- Start Page
- 757
- End Page
- 762
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97594
- DOI
- 10.3938/jkps.65.757
- ISSN
- 0374-4884
- Abstract
- 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 similar to 100%, 23 similar to 90%, and 23 similar to 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.
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