Radiologic Procedure | ACR Rating 2012* | ACR Rating 2015* | ACR Rating 2021 |
---|---|---|---|
MRI without contrast | 8 | 9 | Usually appropriate |
CT head without contrast | 6 | 7 | Usually appropriate |
Tc-99m HMPAO SPECT | 4 | 1 | Usually not appropriate |
FDG-PET | 4 | 2 | Usually not appropriate |
fMRI | 2 | 2 | Usually not appropriate |
DTI | Not featured | 1 | Usually not appropriate |
MRS | Not featured | 2 | Usually not appropriate |
↵* Rating Scale: 1-3, usually not appropriate; 4-6, may be appropriate; 7-9, usually appropriate.