Dome-to-neck ratios in 2D DSA versus 3DRA

	2D DSA	3DRA	P Value
Mean D/N (SD)	1.81 (0.55)	1.56 (0.48)	<.0001*
D/N <1.5, No. (%)	69 (33.7)	119 (58.0)	<.0001†
D/N <2.0, No. (%)	142 (69.3)	173 (84.4)	.0004†

Note:—D/N indicates dome-to-neck ratio; DSA, digital subtraction angiography; 3DRA, 3D rotational angiography.

^*Paired t test, Wilcoxon signed ranked test.

^†Pearson χ² test.