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FIG 1. 3D angiographic image of a posterior communicating artery aneurysm in 3 different manual threshold settings. All 3 images are visually acceptable to delineate vessel and aneurysm anatomy.
A, Low-threshold setting: not all small vessels are visible. After segmentation of the aneurysm, the calculated volume is 179 mm3 (D).
B, Intermediate-threshold setting: better visualization of small vessels. After segmentation of the aneurysm, the calculated volume is 207 mm3 (E).
C, High-threshold setting: exaggerated visibility of small vessels. After segmentation of the aneurysm, the calculated volume is 266 mm3 (F).
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