Table 3:

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

	MRI, Brain		MRI, Spine		CT, Head		PET, Brain	SPECT, Brain
	Without Contrast	Without and With Contrast	Without Contrast	Without and With Contrast	Without Contrast	Without and With Contrast	PET, Brain	SPECT, Brain
Motor neuron disease^a	8	7	8^b	7^b	5	4	3^c	3^c

Note:—MRI indicates MR imaging. Appropriateness criteria scale from 1 to 9; 1, least appropriate; 9, most appropriate.
^a MR spectroscopy, head = rating of 3; functional MRI, head = rating of 2.
^b May need multilevel imaging.
^c For problem solving.