Objective: The objective of the study was to determine whether body weight (BW) can be substituted for body diameters to calculate size-specific dose estimate (SSDE) in the children. Materials and Methods: A total of 196 torso computed tomography (CT) studies were retrospectively reviewed. Anteroposterior diameter (DAP) and lateral diameter (Dlat) were measured, and DAP+Dlat, effective diameter, SSDE diameter and SSDEBW were calculated. Correlation coefficients among body diameters, all SSDE types and percentage changes between CT dose index volumes and SSDEs were analyzed by BW and age subgroups. Results: Overall BW was more strongly correlated with body diameter (r = 0.919–0.960, P < 0.001) than was overall age (r = 0.852–0.898, P < 0.001). The relationship between CT dose index volume and each of the SSDE types (r = 0.934–0.953, P < 0.001), between SSDEBW and all SSDE diameters (r = 0.934–0.953, P < 0.001), and among SSDE diameters (r = 0.950–0.989, P < 0.001) overall had strong correlations with statistical significance. The lowest magnitude difference was SSDEBW−SSDEeff. Conclusion: BW can be used instead of body diameter to calculate all SSDE types, with our suggested best accuracy for SSDEeff and the least variation in age < four years and BW < 20 kg.
Keywords: Body diameter, Body weight, Computed tomography dose index volume, Size-specific dose estimate, Torso
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