Table 3.

Sensitivities of different imaging modalities for VAD.^*

Imaging compared to final clinical diagnosis					Imaging compared to diagnosis by conventional angiography
Imaging modality	Studies	N	N (%) positive	p-value (sensitivity relative to CTA)	Studies	N	N (%) positive	p-value (sensitivity relative to CTA)
CTA	12, 14	32	32 (100%)		12, 14	32	32 (100%)
MRI	3, 15-18	81	50 (62%)	<0.0001	None†
MRA	17-20	34	28 (82%)	0.01	18-20	22	17 (77%)	0.004
Duplex	12, 21-25	99	78 (79%)	0.005	12, 22, 24	28	20 (71%)	0.001

^*Studies evaluating different imaging modalities, compared to clinical diagnosis and compared to conventional angiography. The first set of columns shows numbers of studies of the particular modality compared to clinical diagnosis, and the second set of columns reflects only those studies in which individuals had both conventional angiography and another imaging modality.

^†All studies comparing MRI to angiography only had infarcts on “positive” MRI’s, no vessel findings reported.