Implantable microstimulator: magnetic resonance safety at 1.5 Tesla

Investigative Radiology
Frank G ShellockJohn A Nyenhuis

Abstract

Ex vivo testing is necessary to characterize implants to determine if it is safe for the patient to undergo a magnetic resonance imaging (MRI) examination. Therefore, the objective of this study was to evaluate MR safety for an implantable microstimulator in association with a 1.5 Tesla MR system. A microstimulator (RF BION, Alfred E. Mann Foundation for Scientific Research, Valencia, CA) was evaluated for magnetic field interactions and MRI-related heating. The functional aspects of this implant were assessed immediately before and after exposure to MRI (15 different pulse sequences). Artifacts were also characterized. Magnetic field interactions exhibited by the microstimulator will not pose a hazard after a suitable postimplantation period has elapsed. Temperature changes will not pose a risk. The function of the microstimulator was unaffected by MRI. Artifacts will only create a problem if the area of interest is in proximity to this implant (largest artifact area: T1-weighted spin echo, 2291 mm2; gradient echo, 3310 mm2). The overall findings indicated that it is safe for a patient with the microstimulator to undergo MRI at 1.5 Tesla by following specific safety guidelines described herein.

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Citations

Jul 1, 2008·Neuromodulation : Journal of the International Neuromodulation Society·Frank G ShellockRamakrishna Venugopalan
Mar 29, 2011·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Hiroyuki MuranakaNobuyoshi Tanki
Sep 30, 2006·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Hiroyuki MuranakaGiichirou Nakaya
Mar 23, 2013·Dento Maxillo Facial Radiology·M HasegawaT Ishigami
Feb 25, 2011·The International Journal of Cardiovascular Imaging·Alexander PfeilAndreas Hansch
May 21, 2013·Magnetic Resonance Imaging·Blake Titterington, Frank G Shellock
Jan 21, 2012·Magnetic Resonance Imaging·James D WeilandFrank G Shellock
Jun 15, 2013·Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association·Susann PiesnackEberhard Ludewig
Jul 23, 2011·Neurourology and Urodynamics·Christopher J ChermanskyJ Christian Winters
Aug 21, 2007·Magnetic Resonance Imaging·Frank G ShellockChristophe P Mauge
Mar 31, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Barbara GianesinGian Luca Forni
Oct 31, 2007·Journal of Magnetic Resonance Imaging : JMRI·Frank G Shellock
Nov 24, 2005·Investigative Radiology·Wolfgang R NitzGeorg Frese
Dec 21, 2006·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Frank G ShellockDavid S Fieno
Dec 13, 2007·Stereotactic and Functional Neurosurgery·Paul S LarsonAlastair J Martin
Feb 19, 2019·Acta ortopedica brasileira·Alexandre Fogaça CristanteJosé Claudio Dellamano

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