title: Validation of a Metal Artifact Reduction Algorithm Using 1D Linear Interpolation for Cone Beam CT after Endovascular Coiling Therapy for Cerebral Aneurysms.
abstract: This study aimed to evaluate the effect of a metal artifact reduction (MAR) algorithm using 1D linear interpolation on cone-beam CT (CBCT). We performed phantom and clinical qualitative studies with and without MAR application using 1D linear interpolation. In the phantom study, the standard deviation (SD) was estimated from the images obtained from the water phantom in which a metal coil was placed at the center, and observed the changes in the SDs before and after MAR application. In the clinical qualitative study, the clinical images after endovascular treatment (EVT) for cerebral aneurysms were visually evaluated before and after MAR application. In the phantom study, the SDs after MAR application decreased by 56 to 35% compared with that before MAR application. In the clinical qualitative study, the artifacts from the metal coil decreased or increased depending on locations, and the contrasts of gray matter and white matter were attenuated when MAR was applied. In conclusion, the metal artifact decreases when MAR using 1D linear interpolation is applied to cerebral CBCT. However, another artifacts increase or soft tissue contrast is changed in some cases. MAR largely contributes to the reduction of streaking artifacts, whereas it may induce cerebral parenchyma at distant metal body or quality deterioration of the image not including the metal body. This should be taken into account in the diagnosis of secondary hemorrhage or infarction.
authors.affiliation: Graduate Division of Health Sciences, Komazawa University; Tokyo, Japan - Department of Radiological Technology, Showa University Koto-Toyosu Hospital; Tokyo, Japan - m-yasuda@cmed.showa-u.ac.jp.
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Yasuda
authors.affiliation: Graduate Division of Health Sciences, Komazawa University; Tokyo, Japan.
authors.forename: Kohki
authors.initials: K
authors.lastname: Yoshikawa
authors.affiliation: Graduate School of Nursing and Rehabilitation Sciences, Showa University; Tokyo, Japan.
authors.forename: Kyoichi
authors.initials: K
authors.lastname: Kato
authors.affiliation: Department of Radiological Technology, Showa University Koto-Toyosu Hospital; Tokyo, Japan.
authors.forename: Shogo
authors.initials: S
authors.lastname: Sai
authors.affiliation: Department of Radiological Technology, Showa University Fujigaoka Hospital; Kanagawa, Japan.
authors.forename: Koshi
authors.initials: K
authors.lastname: Sakiyama
authors.affiliation: Department of Radiological Technology, Showa University Fujigaoka Hospital; Kanagawa, Japan.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Kobayashi
authors.affiliation: Department of Radiological Technology, Showa University Hospital; Tokyo, Japan.
authors.forename: Miwa
authors.initials: M
authors.lastname: Oosawa
authors.affiliation: Graduate School of Nursing and Rehabilitation Sciences, Showa University; Tokyo, Japan.
authors.forename: Hisaya
authors.initials: H
authors.lastname: Sato
authors.affiliation: Department of Neurological Surgery, Showa University Fujigaoka Hospital; Kanagawa, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Matsumoto
authors.affiliation: Graduate School of Nursing and Rehabilitation Sciences, Showa University; Tokyo, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nakazawa
mesh_terms: D000465:Algorithms; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D057510:Endovascular Procedures; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000628:therapy; D019047:Phantoms, Imaging
keywords: artifact reduction; cerebral aneurysm; cone beam CT; endovascular treatment; metal artifact