title: [Experimental study of pseudo-stenosis artifact on three-dimensional DSA].
abstract: Rotational three-dimensional digital subtraction angiography (3D-DSA) is very useful for interventional neuroradiology, especially in the endovascular therapy of cerebral aneurysms. However, pseudo-stenosis artifact on the vessel, which runs vertically to the rotational axis, was observed clinically. In this study, this artifact was confirmed in an experiment with 4.5-millimeter diameter vessel phantoms. The attenuation of the phantom at each degree of exposure (44 directions) was measured on the workstation (DSA pixel value). DSA pixel values were plotted from data of 10, 20, 30, 40, and 50 millimeter lengths, respectively. The saturated DSA pixel value of tangent projection on phantoms of 30 millimeters or more in length was observed. This phenomenon induces pseudo-stenosis artifact on 3D-DSA. The maximum reduction in the diameter of the phantom was 27.4% on the length of 50 millimeters. We confirmed that the two-dimensional data vertical to the rotational axis were inaccurate when a straight-coursed, long, segmented vessel was present. Under this special condition, vessels on 3D-DSA were displayed as smaller than their actual diameter.
authors.affiliation: Center for Diagnostic Imaging, Kurume University Hospital.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Tanigawa
authors.forename: Taro
authors.initials: T
authors.lastname: Sakaguchi
authors.forename: Toshi
authors.initials: T
authors.lastname: Abe
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Hyodo
authors.forename: Kazuichi
authors.initials: K
authors.lastname: Hokimoto
authors.forename: Naofumi
authors.initials: N
authors.lastname: Hayabuchi
mesh_terms: D015901:Angiography, Digital Subtraction / Q000379:methods*; D016477:Artifacts; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging; D006801:Humans; D021621:Imaging, Three-Dimensional; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000473:pathology; D019047:Phantoms, Imaging; D015642:Radiology, Interventional