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Background   To correlate body weight, body mass index (BMI), and water-equivalent diameter ( d  w ) and to assess size-specific dose estimates (SSDEs) based on body weight and BMI for chest and abdomen-pelvic CT examinations.Methods   An in-house program was used to calculate  d  w , size-dependent conversion factor ( f ), and SSDE for 1178 consecutive patients undergoing chest and abdomen-pelvic CT examinations. Associations among body weight, BMI, and  d  w  were determined, and linear equations were generated using linear regression analysis of the first 50% of the patient population. SSDEs (SSDE weight  and SSDE BMI ) were calculated based on body weight and BMI as  d  w  surrogates on the second 50% of the patient population. Mean root-mean-square errors of SSDE weight  and SSDE BMI  were computed with SSDE from the axial images as reference values.Results   Both body weight and BMI correlated strongly with  d  w  for the chest ( r  = 0.85, 0.87, all  p  < 0.001) and abdomen-pelvis ( r  = 0.85, 0.86, all  p  < 0.001). Mean values of SSDE weight  and SSDE BMI  based on the linear equations for body weight, BMI, and  d  w  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.Conclusions   Both body weight and BMI, serving as  d  w  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%.

Size-Specific Dose Estimates of Radiation Based on Body Weight and Body Mass Index for Chest and Abdomen-Pelvic CTs