title: Assessment of the Ventrix parenchymal intracranial pressure monitoring probe (NL950-P) and Monitor (NL950-100) in a 3 Tesla magnetic resonance scanner.
abstract: Magnetic resonance (MR) imaging and spectroscopy provide important information in patients with acute head injury. However, optimal patient management requires intracranial pressure (ICP) monitoring. There are few reports on the use of ICP sensors in an MR environment. We tested the Ventrix parenchymal intracranial pressure monitoring probe and monitor (Integra Neurosciences, USA), modified by the use of a fibre-optic extension cable, within a 3 Tesla MR system. The device performed well in the MR environment, but one element within the fibre-optic extension was significantly ferromagnetic. The ICP probe produced a small susceptibility artefact on spin echo images, and a larger artefact on gradient echo images. The MR safety of the integrated system is probably acceptable, but could be easily improved with minor modifications. Although the system is MR compatible and produces generally acceptable imaging even at 3 Tesla, there is significant degradation of image quality during gradient echo sequences.
authors.affiliation: Department of Anaesthesia and Wolfson Brain Imaging Centre, Box 93, Addenbrookes Hospital, University of Cambridge, CB2 2QQ, UK.
authors.forename: J P
authors.initials: JP
authors.lastname: Coles
authors.forename: L A
authors.initials: LA
authors.lastname: Steiner
authors.forename: J
authors.initials: J
authors.lastname: Martin
authors.forename: T
authors.initials: T
authors.lastname: Donovan
authors.forename: P J
authors.initials: PJ
authors.lastname: Hutchinson
authors.forename: T A
authors.initials: TA
authors.lastname: Carpenter
authors.forename: D K
authors.initials: DK
authors.lastname: Menon
mesh_terms: D016477:Artifacts; D001930:Brain Injuries / Q000175:diagnosis* / Q000503:physiopathology; D004869:Equipment Safety; D005336:Fiber Optic Technology / Q000295:instrumentation; D006801:Humans; D007427:Intracranial Pressure; D008279:Magnetic Resonance Imaging; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D019047:Phantoms, Imaging