Numerical and experimental study of RF-induced heating of passive implantable medical devices at 5T MRI.

Purpose: To assess the RF-induced heating of orthopedic implants in a 5T whole-body MRI system through electromagnetic simulations and experimental validation, with the goal of ensuring patient safety in ultra-high field (UHF) MRI.

Methods: Numerical and experimental studies were conducted to evaluate RF-induced heating in five titanium screws (4-12 cm) inside a 60-cm wide 5T whole-body MRI scanner using the standard ASTM phantom. The temperature rise over 15 min was determined through full-wave electromagnetic simulations and direct measurements.

Impact of lateral movement of patients on radiofrequency-induced heating of active and passive implantable medical devices at 3T MRI.

Purpose: To investigate the implications of lateral patient position on radiofrequency (RF)-induced heating of active and passive implantable medical devices (AIMDs and PIMDs) in a wide-bore 3T MRI system.

Methods: In vitro simulations for two rod positions and three lateral phantom shifts were experimentally validated inside a wide-bore 3T MRI scanner. Three commercially available AIMDs (40-cm peripheral nerve stimulator [PNS], 45-cm restorative neurostimulator, and 50-cm cardiac rhythm management system) were analyzed.

RF-induced Heating for Partially-In and Partially-Out Bipolar Parallel Medical Electrodes.

RF-induced heating is evaluated for unipolar and bipolar Partially-In and Partially-Out (PIPO) medical electrodes at 1.5T MRI. Numerical simulations were performed by modeling simplified unipolar and bipolar electrodes to understand the RF heating mechanism.

RF-induced heating reduction by minimizing the external portion of the partially in and partially out medical devices under MRI at 1.5 T.

Purpose: To address the issue of RF-induced heating for partially in and partially out (PIPO) medical devices during 1.5 T MRI scans by proposing a method of minimizing the external portion.

Methods: A method of tightly winding the external segment of the PIPO device is proposed to minimize the overall device effective reception length during MRI scans to mitigate the RF-induced heating.