Validity of the size-specific dose estimate in adults undergoing coronary CT angiography: comparison with the volume CT dose index

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• 作者：Masafumi Kidoh ; Daisuke Utsunomiya…
• 关键词：Heart ; Multi ; detector computed tomography ; Radiation doses ; Adult
• 刊名：The International Journal of Cardiovascular Imaging (formerly Cardiac Imaging)
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：31
• 期：2-supp
• 页码：205-211
• 全文大小：826 KB
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• 作者单位：Masafumi Kidoh (1)
  Daisuke Utsunomiya (1)
  Seitaro Oda (1)
  Yoshinori Funama (2)
  Hideaki Yuki (1)
  Takeshi Nakaura (1)
  Noriyuki Kai (1)
  Takeshi Nozaki (1)
  Yasuyuki Yamashita (1)
  
  1. Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto, 860-8556, Japan
  2. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto, 860-8556, Japan
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Cardiology
  
• 出版者：Springer Netherlands
• ISSN：1573-0743

文摘

Size-specific dose estimate (SSDE) takes into account the patient size but remains to be fully validated for adult coronary computed tomography angiography (CCTA). We investigated the appropriateness of SSDE for accurate estimation of patient dose by comparing the SSDE and the volume CT dose index (CTDI_vol) in adult CCTA. This prospective study received institutional review board approval, and informed consent was obtained from each patient. We enrolled 37 adults who underwent CCTA with a 320-row CT. High-sensitivity metal oxide semiconductor field effect transistor dosimeters were placed on the anterior chest. CTDI_vol reported by the scanner based on a 32-cm phantom was recorded. We measured chest diameter to convert CTDI_vol to SSDE. Using linear regression, we then correlated SSDE with the mean measured skin dose. We also performed linear regression analyses between the skin dose/CTDI_vol and the body mass index (BMI), and the skin dose/SSDE and BMI. There was a strong linear correlation (r = 0.93, P < 0.001) between SSDE (mean 37 ± 22 mGy) and mean skin dose (mean 17.7 ± 10 mGy). There was a moderate negative correlation between the skin dose/CTDI_vol and BMI (r = 0.45, P < 0.01). The skin dose/SSDE was not affected by BMI (r = 0.06, P > 0.76). SSDE yields a more accurate estimation of the radiation dose without estimation errors attributable to the body size of adult patients undergoing CCTA.