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. 2015 Jun 2;55(6):498–504. doi: 10.2176/nmc.oa.2014-0390

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© 2015 The Japan Neurosurgical Society

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Fig. 2. — Definition of morphologic parameters. The parameters measured in three-dimensional models including size, height, maximum height (Hmax), width, neck width, and parent vessel diameter (Dv). Left: bottleneck factor (BNF) = width/neck width, height/width (H/W) ratio = height/width, aspect ratio (AR) = height/neck width, size ratio (SR) = Hmax/Dv. Right: Calculation of SR in bifurcation aneurysm. Dvi = (Dia + Dib)/2, Dia presents the vessel diameter at the neck or branching point and Dib presents the vessel diameter 1.5 Dia away from Dia (i = 1, 2, 3); Dv = (Dv1 + Dv2 + Dv3)/3; SR = Hmax/Dv.