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TABLE 7: Impact of contrast enhancement in all segments and regions for all vessels and for only abnormal vessels
Impact of Contrast Enhancement Grade Change Frequency
BA ACA ICA M1 M2 P1/P2 P3 Total
All Vessels
No effect 40 39 71 71 76 79 79 455
Adverse effect but tolerable 0 0 5 6 3 1 1 16
Nondiagnostic 0 1 4 3 1 0 0 9
 Total 40 40 80 80 80 80 80 480
Only Abnormal Vessels on Precontrast MR Angiograms
No effect 0 0 4 13 17 2 5 41
Adverse effect but tolerable 0 1 3 1 3 0 0 8
Nondiagnostic 0 0 1 0 0 0 0 1
 Total 0 1 8 14 20 2 5 50

Impact of Contrast Enhancement Grade Change	Frequency
Impact of Contrast Enhancement Grade Change	BA	ACA	ICA	M1	M2	P1/P2	P3	Total
	All Vessels
No effect	40	39	71	71	76	79	79	455
Adverse effect but tolerable	0	0	5	6	3	1	1	16
Nondiagnostic	0	1	4	3	1	0	0	9
Total	40	40	80	80	80	80	80	480
	Only Abnormal Vessels on Precontrast MR Angiograms
No effect	0	0	4	13	17	2	5	41
Adverse effect but tolerable	0	1	3	1	3	0	0	8
Nondiagnostic	0	0	1	0	0	0	0	1
Total	0	1	8	14	20	2	5	50