Table 2:

Clinical condition: dementia and movement disorders (degenerative diseases of the extrapyramidal system)

	MRI, Brain		CT, Head		PET, Brain	SPECT, Brain	MRS, Head	fMRI, Head
	Without Contrast	Without and With Contrast	Without Contrast	Without and With Contrast
Suspected HD	8	7	5	3	5a	5a	3	2
Clinical features suggestive of NBIA	8	7	5	4	3a	3a	3	3
Parkinson's disease: typical clinical features and responds to levodopa	7a	7a	6	5	6a,b	6a,c	3	2
PD syndrome: atypical clinical features not responsive to levodopa	8	7	5	4	6a	6a	3	2

Note:—MRI indicates MR imaging; MRS, MR spectroscopy; fMRI, functional MRI. Appropriateness criteria scale from 1 to 9; 1, least appropriate; 9, most appropriate.

^aFor problem solving.

^bDopa PET.

^cSpecific ligand.