title: Distortion in magnetic resonance images obtained for stereotactic localization. Case report.
abstract: The purpose of this paper was to note a potential source of error in magnetic resonance (MR) imaging. Magnetic resonance images were acquired for stereotactic planning for GKS of a vestibular schwannoma in a female patient. The images were acquired using three-dimensional sequence, which has been shown to produce minimal distortion effects. The images were transferred to the planning workstation, but the coronal images were rejected. By examination of the raw data and reconstruction of sagittal images through the localizer side plate, it was clearly seen that the image of the square localizer system was grossly distorted. The patient was returned to the MR imager for further studies and a metal clasp on her brassiere was identified as the cause of the distortion.
authors.affiliation: National Centre for Stereotactic Radiosurgery, Department of Medical Physics and Clinical Engineering, Royal Hallamshire Hospital, Sheffield, England.
authors.forename: L
authors.initials: L
authors.lastname: Walton
authors.forename: A
authors.initials: A
authors.lastname: Hampshire
authors.forename: P
authors.initials: P
authors.lastname: Vaughan
authors.forename: D M
authors.initials: DM
authors.lastname: Forster
authors.forename: A A
authors.initials: AA
authors.lastname: Kemeny
authors.forename: M W
authors.initials: MW
authors.lastname: Radatz
mesh_terms: D000328:Adult; D016477:Artifacts; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D009464:Neuroma, Acoustic / Q000175:diagnosis / Q000601:surgery*; D011785:Quality Assurance, Health Care; D016634:Radiosurgery