Table 3.

Exponential Relationship between Effective Dose and Average Chest Diameter before and after Normalization by DLP

Note.—Equations for effective dose before and after normalization by DLP are E(d_chest) = exp(a_Ed_chest + bE) and k(d_chest) = exp(a_kd_chest + bk), respectively. Units for E and k are millisieverts per 100 mAs and millisieverts per milligray-centimeters, respectively.

^*Root-mean-square of residuals represents the average discrepancy between the effective dose predicted by using the fitting function and the effective dose calculated from the organ dose values of individual patients. It has the same unit as E or k.