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Table 2 Common CT dose descriptors

From: A review on chest CT scanning parameters implemented in COVID-19 patients: bringing low-dose CT protocols into play

Dose index

Mathematical formula

Weighted CTDI [37]

CTDIw (mGy) = 1/3 CTDI100,center + 2/3 CTDI100,periphery

Volumetric CTDI [37]

CTDIv (mGy) = CTDIw/pitch

DLP [38]

CTDIv × scan length (mGy × cm)

  1. mGy milli-Gray, pitch the ratio of the table increment per rotation to the nominal beam width