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Table 2 Summary data for CTDIvol, 75kg, DLP75kg, and scan length, for all examinations and clinical purposes (Mean DLP data (not weight-derived) normalised to a 16cm CTDI phantom are given for PET/CT brain)

From: A Nordic survey of CT doses in hybrid PET/CT and SPECT/CT examinations

ExaminationClinical purpose of CTNumber of datasetsCTDIvol,75kg (mGy)DLP75kg (mGy.cm)Scan length (cm)
   MeanMedianMinMaxMax/minMeanMedianMinMaxMax/minMeanMedianMinMaxMax/min
PET/CT oncologyAC only61.41.40.32.48.0141136292639.0102103871141.3
L/C152.72.61.84.92.72702581694982.99999801161.5
Diagnostica119.98.56.414.82.396382568314452.110098851241.5
PET/CT infection/inflammationAC only41.81.40.34.414.71941312748818.110198951131.2
L/C133.32.51.87.03.93463261696193.7110104891671.9
Diagnostic18.5----766----90----
PET/CT brainAC only114.25.70.58.517.0941041319615.0222317251.5
L/C915.010.73.166.921.630221171119416.8222318251.4
Diagnostic145.8----1068----23----
PET/CT and SPECT/CT cardiacAC only302.11.60.47.117.8403559819.6232314332.4
L/C72.71.91.38.06.26739281575.6202019211.1
SPECT/CT lungAC only25.75.70.41127.51851851335627.4343432361.1
L/C122.62.51.15.65.19389421774.2363530431.5
SPECT/CT boneAC only12.1----235----111----
L/C302.82.01.17.36.61531084040210.05543371143.1
Diagnostic12.34----255----69----
SPECT/CT parathyroidAC only13.2----100----32----
L/C134.13.51.510.67.1150131372927.8404024622.6
Diagnostic115.6----365----24----
  1. aNDRL and achievable doses are not presented for PET/CT oncology diagnostic CT scans as standalone diagnostic NDRLs should be used for comparison