Department of Radiology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China.
Shenshi Technology, Co., Ltd, Hangzhou, Zhejiang, China.
Biomed Res Int. 2020 Jul 10;2020:6046501. doi: 10.1155/2020/6046501. eCollection 2020.
To correlate body weight, body mass index (BMI), and water-equivalent diameter ( ) and to assess size-specific dose estimates (SSDEs) based on body weight and BMI for chest and abdomen-pelvic CT examinations.
An in-house program was used to calculate , size-dependent conversion factor (), and SSDE for 1178 consecutive patients undergoing chest and abdomen-pelvic CT examinations. Associations among body weight, BMI, and were determined, and linear equations were generated using linear regression analysis of the first 50% of the patient population. SSDEs (SSDE and SSDE) were calculated based on body weight and BMI as surrogates on the second 50% of the patient population. Mean root-mean-square errors of SSDE and SSDE were computed with SSDE from the axial images as reference values.
Both body weight and BMI correlated strongly with for the chest ( = 0.85, 0.87, all < 0.001) and abdomen-pelvis ( = 0.85, 0.86, all < 0.001). Mean values of SSDE and SSDE based on the linear equations for body weight, BMI, and were in close agreement with SSDE from the axial images, with overall mean root-mean-square errors of 0.62 mGy (6.10%) and 0.57 mGy (5.65%), for chest, and 0.76 mGy (5.61%) and 0.71 mGy (5.22%), for abdomen-pelvis, respectively.
Both body weight and BMI, serving as surrogates, can be used to calculate SSDEs in the chest and abdomen-pelvis CT examinations, providing values comparable to SSDEs from the axial images, with an overall mean root-mean-square error of less than 0.76 mGy or 6.10%.
为了关联体重、体重指数（BMI）和水等效直径（），并评估基于体重和 BMI 的胸部和腹部-盆腔 CT 检查的大小特异性剂量估计值（SSDE）。
使用内部程序计算了 1178 例连续进行胸部和腹部-盆腔 CT 检查的患者的、与大小相关的转换因子（）和 SSDE。确定了体重、BMI 和之间的相关性，并使用前 50%患者人群的线性回归分析生成线性方程。基于体重和 BMI 作为替代物，在患者人群的后 50%中计算 SSDE（SSDE 和 SSDE）。将基于体重和 BMI 的 SSDE 的均方根误差与轴向图像的 SSDE 进行计算，作为参考值。
体重和 BMI 均与胸部（=0.85，0.87，均<0.001）和腹部-盆腔（=0.85，0.86，均<0.001）的呈强相关。基于体重、BMI 和的线性方程的 SSDE 和 SSDE 的平均值与轴向图像的 SSDE 非常吻合，总体均方根误差分别为 0.62 mGy（6.10%）和 0.57 mGy（5.65%），用于胸部，0.76 mGy（5.61%）和 0.71 mGy（5.22%），用于腹部-盆腔。
体重和 BMI 作为替代物，可用于计算胸部和腹部-盆腔 CT 检查中的 SSDE，提供与轴向图像的 SSDE 相当的值，总体均方根误差小于 0.76 mGy 或 6.10%。
