Volume Embolization Ratio

The Volume Embolization Ratio (VER) for coiling was calculated using the following algebraic equation: VER = (volume of the embolized coil) / (volume of the aneurysm) * 100%

The aneurysm volume was calculated before embolization as follows assuming that the aneurysm was ellipsoid: aneurysm volume (AV) = (4π/3) * (A/2) * (B/2) * (C/2), where A, B and C are the aneurysm length, width and height, respectively 1).

1)
Zhang Y, Xing X, Shen X, Zhu X. The Volume Embolization Ratio of Intraaneurysmal Embolization Using Guglielmi Detachable Coils. Turk Neurosurg. 2015;25(6):866-72. doi: 10.5137/1019-5149.JTN.7491-12.2. PubMed PMID: 26617134.