Fig 3.

Comparison of the distribution of dome-to-neck ratios in 2D DSA and 3DRA. Histogram shows the frequency of aneurysms with various dome-to-neck ratios. Frequencies are calculated for dome-to-neck intervals of 0.25; for example, ratios from 2.0 to 2.25 are grouped into a single frequency number. The black line denotes 3DRA measurements, whereas the white line denotes 2D DSA measurements. Vertical dashed lines indicate previously published thresholds for wide-neck aneurysms (black line, 1.5; white line, 2.0). Thus, aneurysms to the left of a vertical line would be considered wide-neck.