Evaluation of the stepwise collimation method for the reduction of the patient dose in full spine radiography

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• 作者：Boram Lee (1)
  Sunyoung Lee (2)
  Injeong Yang (3)
  Myeonggeun Yoon (1)
  
• 关键词：87.50. ; a ; 87.52. ; g ; 87.53.Dq ; Secondary cancer risk ; Spine radiography ; Monte Carlo simulation
• 刊名：Journal of the Korean Physical Society
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：64
• 期：9
• 页码：1380-1384
• 全文大小：
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• 作者单位：Boram Lee (1)
  Sunyoung Lee (2)
  Injeong Yang (3)
  Myeonggeun Yoon (1)
  
  1. Department of Bio-convergence Engineering, Korea University, Seoul, 136-701, Korea
  2. Department of Radiation Oncology, Sun Medical Center, Daejeon, 305-330, Korea
  3. Department of Radiology, Seoul National University Hospital Medical Center, Seoul, 110-744, Korea
  
• ISSN：1976-8524

文摘

The purpose of this study is to evaluate the dose reduction when using the stepwise collimation method for scoliosis patients undergoing full spine radiography. A Monte Carlo simulation was carried out to acquire dose vs. volume data for organs at risk (OAR) in the human body. While the effective doses in full spine radiography were reduced by 8, 15, 27 and 44% by using four different sizes of the collimation, the doses to the skin were reduced by 31, 44, 55 and 66%, indicating that the reduction of the dose to the skin is higher than that to organs inside the body. Although the reduction rates were low for the gonad, being 9, 14, 18 and 23%, there was more than a 30% reduction in the dose to the heart, suggesting that the dose reduction depends significantly on the location of the OARs in the human body. The reduction rate of the secondary cancer risk based on the excess absolute risk (EAR) varied from 0.6 to 3.4 per 10,000 persons, depending on the size of the collimation. Our results suggest that the stepwise collimation method in full spine radiography can effectively reduce the patient dose and the radiation-induced secondary cancer risk.