Table 1.

ACR Appropriateness Criteria, 2012, 2015, and 2021 Versions

Radiologic ProcedureACR Rating
ACR Rating
ACR Rating
MRI without contrast89Usually appropriate
CT head without contrast67Usually appropriate
Tc-99m HMPAO SPECT41Usually not appropriate
FDG-PET42Usually not appropriate
fMRI22Usually not appropriate
DTINot featured1Usually not appropriate
MRSNot featured2Usually not appropriate
  • * Rating Scale: 1-3, usually not appropriate; 4-6, may be appropriate; 7-9, usually appropriate.