Table 2.

List of the risk metrics.

Metric	Name	Description	Unit
$E_{\mathit{DLP}}$	DLP-based effective dose	Effective dose to a reference phantom based on CT radiation output and pre-calculated coefficients1	mSv
$E_{\mathit{OD}}$	Organ dose-based effective dose	Effective dose based on patient organ doses for a specific imaging condition6	mSv
$\mathit{RI}$	Risk index	Risk index based on patient organ doses for a specific imaging condition13	Number of cancers per 100 patients
${\mathit{RI}}_{\mathit{rp}}$	Risk index for a reference patient	Risk index for 35 year old patient undergoing the same exam13	Number of cancers per 100 patients
$f$	f-factor	Risk index to relative effective dose conversion factor: $f=\frac{\mathit{RI}}{{\mathit{RI}}_{\mathit{rp}}}$	Dimensionless
$E_r$	Relative effective dose	Effective dose based on patient organ doses for a specific imaging condition and adjusted for a factor that incorporates age- and sex- specific risk10	mSv’