Fig. 1.

Method of using the simplified volume calculation function in the cerebral angiography system and flat-panel detectors (Artis Q BA Twin; Siemens AG, Forchheim, Germany).

(1) After obtaining a three-dimensional rotational angiography (3D-RA) image, the ‘Analyze’ button in the upper right corner of the Analyze screen is pressed.

(2) The ‘Aneurysm Analysis’ button is pressed.

(3) Three points are placed on the aneurysm body and the distal and proximal normal vessels. At this stage, even if the aneurysm is clearly visible, if the device does not recognize the aneurysm, it cannot place a point on the aneurysm body, and therefore, such cases were excluded from this study.

(4) The ‘Analyze’ button is pressed.

(5) The automatic volume analysis system calculates the aneurysm volume.