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Size-specific dose estimate (  $\mathbf{SSDE}$  ) index appears to be more suitable than the commonly used volume computed tomography dose index (  $\mathbf{C}{\mathbf{TDI}}_{\mathbf{vol}}$  ) to estimate the dose delivered to the patient during a computed tomography (CT) scan. We evaluated whether an   ${\mathbf{SSDE}}_{\mathbf{BMI}}$   can be determined from the patient’s body mass index (  $\mathbf{BMI}$  ) with sufficient reliability in the case that a   $\mathbf{SSDE}$   is not given by the CT scanner. For each of the three most used examination types, CT examinations of 50 female and 50 male patients were analyzed. The   $\mathbf{SSDE}$   values automatically provided by the scanner were compared with   ${\mathbf{SSDE}}_{\mathbf{BMI}}$   determined from   $\mathbf{C}{\mathbf{TDI}}_{\mathbf{vol}}$   and   $\mathbf{BMI}$  . A good accordance of   ${\mathbf{SSDE}}_{\mathbf{BMI}}$   and   $\mathbf{SSDE}$   was found for the chest and abdominal regions. A low correlation was observed for the head region. The presented method is a simple and practically useful surrogate approach for the chest and abdominal regions but not for the head.

CAN THE SIZE-SPECIFIC DOSE ESTIMATE BE DERIVED FROM THE BODY MASS INDEX? A FEASIBILITY STUDY