Thérèse Barbier1,2, Sarra Aissani1, Nicolas Weber1, Cédric Pasquier1, Jacques Felblinger3,4,5. 1. IADI, U947, INSERM, Université de Lorraine, Nancy, France. 2. Axon' Cable, Montmirail, France. 3. IADI, U947, INSERM, Université de Lorraine, Nancy, France. j.felblinger@chru-nancy.fr. 4. CIC 1433 Innovation Technologique, INSERM, CHRU Nancy, Nancy, France. j.felblinger@chru-nancy.fr. 5. IADI (Université de Lorraine-INSERM), Bâtiment Recherche (anciennement EFS), Rez-de-Chaussé, CHRU de Nancy Brabois, Rue du Morvan, 54511, Vandoeuvre Cedex, France. j.felblinger@chru-nancy.fr.
Abstract
PURPOSE: To evaluate the function of an active implantable medical device (AIMD) during magnetic resonance imaging (MRI) scans. The induced voltages caused by the switching of magnetic field gradients and rectified radio frequency (RF) pulse were measured, along with the AIMD stimulations. MATERIALS AND METHODS: An MRI-compatible voltage probe with a bandwidth of 0-40 kHz was designed. Measurements were carried out both on the bench with an overvoltage protection circuit commonly used for AIMD and with a pacemaker during MRI scans on a 1.5 T (64 MHz) MR scanner. RESULTS: The sensor exhibits a measurement range of ± 15 V with an amplitude resolution of 7 mV and a temporal resolution of 10 µs. Rectification was measured on the bench with the overvoltage protection circuit. Linear proportionality was confirmed between the induced voltage and the magnetic field gradient slew rate. The pacemaker pacing was recorded successfully during MRI scans. CONCLUSION: The characteristics of this low-frequency voltage probe allow its use with extreme RF transmission power and magnetic field gradient positioning for MR safety test of AIMD during MRI scans.
PURPOSE: To evaluate the function of an active implantable medical device (AIMD) during magnetic resonance imaging (MRI) scans. The induced voltages caused by the switching of magnetic field gradients and rectified radio frequency (RF) pulse were measured, along with the AIMD stimulations. MATERIALS AND METHODS: An MRI-compatible voltage probe with a bandwidth of 0-40 kHz was designed. Measurements were carried out both on the bench with an overvoltage protection circuit commonly used for AIMD and with a pacemaker during MRI scans on a 1.5 T (64 MHz) MR scanner. RESULTS: The sensor exhibits a measurement range of ± 15 V with an amplitude resolution of 7 mV and a temporal resolution of 10 µs. Rectification was measured on the bench with the overvoltage protection circuit. Linear proportionality was confirmed between the induced voltage and the magnetic field gradient slew rate. The pacemaker pacing was recorded successfully during MRI scans. CONCLUSION: The characteristics of this low-frequency voltage probe allow its use with extreme RF transmission power and magnetic field gradient positioning for MR safety test of AIMD during MRI scans.
Keywords:
Active medical device; Induced voltage; Low-frequency sensor; MR safety; Malfunction
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