Validity of the size-specific dose estimate in adults undergoing coronary CT angiography: comparison with the volume CT dose index
Validity of the size-specific dose estimate in adults undergoing coronary CT angiography: comparison with the volume CT dose index
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DOI：
10.1007/s10554-015-0782-z
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发表时间：
2015-12-01
影响因子：
2.1
通讯作者：
Yamashita, Yasuyuki
中科院分区：
文献类型：
--
作者：
Kidoh, Masafumi;Utsunomiya, Daisuke;Yamashita, Yasuyuki
特定尺寸剂量估计（SSDE）考虑了患者的尺寸，但仍有待于对成人冠状动脉计算机断层扫描血管造影（CCTA）进行充分验证。我们通过比较成人CCTA中的SSDE和体积CT剂量指数（CTDIvol），研究了SSDE用于准确估计患者剂量的适当性。这项前瞻性研究获得了机构审查委员会的批准，并获得了每例患者的知情同意书。我们招募了37名使用320排CT进行CCTA的成人。高灵敏度金属氧化物半导体场效应晶体管剂量计被放置在前胸。记录扫描仪基于32 cm体模报告的CTDIvol。我们测量了胸部直径以将CTDIvol转换为SSDE。使用线性回归，我们然后将SSDE与平均测量皮肤剂量相关。我们还对皮肤剂量/CTDIvol和体重指数（BMI）以及皮肤剂量/SSDE和BMI进行了线性回归分析。SSDE（平均37 +/-A22 mGy）和平均皮肤剂量（平均17.7 +/-A10 mGy）之间存在强线性相关（r = 0.93，P < 0.001）。皮肤剂量/CTDIvol与BMI呈中度负相关（r = 0.45，P < 0.01）。BMI对皮肤剂量/SSDE无影响（r = 0.06，P > 0.76）。SSDE可更准确地估计辐射剂量，而不会产生因接受CCTA的成人患者的体型而导致的估计误差。
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 +/- A 22 mGy) and mean skin dose (mean 17.7 +/- A 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.