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Quantifying radiation burden is essential for justification, optimization, and personalization of CT procedures and can be characterized by a variety of risk surrogates inducing different radiological risk reflections. This study compared how twelve such metrics can characterize risk across patient populations.

This study included 1394 CT examinations (abdominopelvic and chest). Organ doses were calculated using Monte Carlo methods. The following risk surrogates were considered: volume computed tomography dose index (CTDI_vol), dose-length product (DLP), size-specific dose estimate (SSDE), DLP-based effective dose (ED_k ), dose to a defining organ (OD_D), effective dose and risk index based on organ doses (ED_OD, RI), and risk index for a 20-year-old patient (RI_rp). The last three metrics were also calculated for a reference ICRP …