RT Journal Article SR Electronic T1 Volume Measurement of Intracranial Aneurysms from 3D Rotational Angiography: Improvement of Accuracy by Gradient Edge Detection JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 2569 OP 2572 VO 26 IS 10 A1 Bescós, Javier Oliván A1 Slob, Marjan J. A1 Slump, Cornelis H. A1 Sluzewski, Menno A1 van Rooij, Willem Jan YR 2005 UL http://www.ajnr.org/content/26/10/2569.abstract AB Summary: Manual volume measurement of intracranial aneurysms from 3D rotational angiography varies on different threshold settings and, therefore, is operator-dependent. We developed and validated a method based on automatic gradient edge detection that is independent on threshold settings and provides an accurate and reproducible volume measurement. This method was compared with manual volume calculation in 13 aneurysm phantoms, and the results were significantly more accurate.