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Table 1 Suggested NDRL and achievable doses for PET/CT and SPECT/CT examinations according to clinical purpose (Mean DLP data (not weight-derived) normalised to a 16-cm CTDI phantom are given for PET/CT brain; NDRL and achievable doses are not presented for PET/CT oncology diagnostic CT scans as standalone diagnostic NDRLs should be used for comparison)

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

ExaminationClinical purposeSuggested NDRL (75th percentile)Achievable dose (50th percentile)
CTDIvol (mGy)DLP ( (mGy)DLP (
PET/CT oncologyLocalisation/characterisation2.93102.6258
PET/CT infection/inflammationLocalisation/characterisation3.54312.5326
PET/CT brainAC only6.41485.7104
PET/CT and SPECT/CT cardiacAC only2.2531.635
SPECT/CT lungLocalisation/characterisation2.91172.589
SPECT/CT bone (main body)Localisation/characterisation4.02152.0108
SPECT/CT parathyroidLocalisation/characterisation5.71993.5131