title: Active MR tracking on a 0.2 Tesla MR imager.
abstract: An active MR tracking system was implemented on a 0.2 Tesla open MRI system. Interventional devices with receive-only microcoils at their tips were developed and investigated on the scanner. Microcoils having a diameter of about 1 mm and 20 turns were found to provide sufficient signal-to-noise ratios for stable tracking. Positional accuracy and precision were found to be acceptable under practical conditions. Simulation of MR-guided biopsy using biplane images with tracking was performed in a gelatin phantom and dog livers. Successful tracking of catheters with integrated microcoils was also demonstrated in the aorta and IVC of live dogs.
authors.affiliation: Department of Radiology, Yamanashi Medical University, Nakakoma-gun, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Aoki
authors.forename: A
authors.initials: A
authors.lastname: Nanbu
authors.forename: T
authors.initials: T
authors.lastname: Araki
authors.forename: X
authors.initials: X
authors.lastname: Ma
authors.forename: T
authors.initials: T
authors.lastname: Araki
authors.forename: H
authors.initials: H
authors.lastname: Kumagai
authors.forename: C L
authors.initials: CL
authors.lastname: Dumoulin
authors.forename: R D
authors.initials: RD
authors.lastname: Darrow
authors.forename: N
authors.initials: N
authors.lastname: Shimazu
authors.forename: T
authors.initials: T
authors.lastname: Tsukamoto
authors.forename: H
authors.initials: H
authors.lastname: Moriya
authors.forename: H
authors.initials: H
authors.lastname: Nakajima
mesh_terms: D000818:Animals; D001707:Biopsy, Needle / Q000295:instrumentation; D002404:Catheterization; D004285:Dogs; D004867:Equipment Design; D005240:Feasibility Studies; D006801:Humans; D008099:Liver / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D019047:Phantoms, Imaging