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

The International Journal of Cardiovascular Imaging volume 31, pages 205–211 (2015)Cite this article

Abstract

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 (CTDIvol) 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. CTDIvol reported by the scanner based on a 32-cm phantom was recorded. We measured chest diameter to convert CTDIvol 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/CTDIvol 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/CTDIvol 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.

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Affiliations

  1. Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto, 860-8556, Japan

    Masafumi Kidoh, Daisuke Utsunomiya, Seitaro Oda, Hideaki Yuki, Takeshi Nakaura, Noriyuki Kai, Takeshi Nozaki & Yasuyuki Yamashita

  2. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto, 860-8556, Japan

    Yoshinori Funama

Authors
  1. Masafumi Kidoh
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  2. Daisuke Utsunomiya
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  3. Seitaro Oda
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  4. Yoshinori Funama
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  5. Hideaki Yuki
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  6. Takeshi Nakaura
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  7. Noriyuki Kai
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  8. Takeshi Nozaki
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  9. Yasuyuki Yamashita
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Correspondence to Masafumi Kidoh.

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Kidoh, M., Utsunomiya, D., Oda, S. et al. Validity of the size-specific dose estimate in adults undergoing coronary CT angiography: comparison with the volume CT dose index. Int J Cardiovasc Imaging 31, 205–211 (2015). https://doi.org/10.1007/s10554-015-0782-z

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  • DOI: https://doi.org/10.1007/s10554-015-0782-z

Keywords

  • Heart
  • Multi-detector computed tomography
  • Radiation doses
  • Adult