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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