Measuring RF‐induced currents inside implants: Impact of device configuration on MRI safety of cardiac pacemaker leads
Open Access
- 8 January 2009
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Medicine
- Vol. 61 (3), 570-578
- https://doi.org/10.1002/mrm.21881
Abstract
Radiofrequency (RF)-related heating of cardiac pacemaker leads is a serious concern in magnetic resonance imaging (MRI). Recent investigations suggest such heating to be strongly dependent on an implant's position within the surrounding medium, but this issue is currently poorly understood. In this study, phantom measurements of the RF-induced electric currents inside a pacemaker lead were performed to investigate the impact of the device position and lead configuration on the amount of MRI-related heating at the lead tip. Seven hundred twenty device position/lead path configurations were investigated. The results show that certain configurations are associated with a highly increased risk to develop MRI-induced heating, whereas various configurations do not show any significant heating. It was possible to precisely infer implant heating on the basis of current intensity values measured inside a pacemaker lead. Device position and lead configuration relative to the surrounding medium are crucial to the amount of RF-induced heating in MRI. This indicates that a considerable number of implanted devices may incidentally not develop severe heating in MRI because of their specific configuration in the body. Small variations in configuration can, however, strongly increase the risk for such heating effects, meaning that hazardous situations might appear during MRI. Magn Reson Med, 2009.Keywords
This publication has 24 references indexed in Scilit:
- Spatial distribution of RF‐induced E‐fields and implant heating in MRIMagnetic Resonance in Medicine, 2008
- Clinical Utility and Safety of a Protocol for Noncardiac and Cardiac Magnetic Resonance Imaging of Patients With Permanent Pacemakers and Implantable-Cardioverter Defibrillators at 1.5 TeslaCirculation, 2006
- Cardiac pacemaker: In vitro assessment at 1.5 TAmerican Heart Journal, 2006
- Power deposition inside a phantom for testing of MRI heatingIEEE Transactions on Magnetics, 2005
- In vivo heating of pacemaker leads during magnetic resonance imagingEuropean Heart Journal, 2004
- RF‐induced temperature elevation along metallic wires in clinical magnetic resonance imaging: Influence of diameter and lengthMagnetic Resonance in Medicine, 2004
- Magnetic resonance imaging and cardiac pacemaker safety at 1.5-TeslaJournal of the American College of Cardiology, 2004
- On the heating of linear conductive structures as guide wires and catheters in interventional MRIJournal of Magnetic Resonance Imaging, 2001
- Heating Around Intravascular Guidewires by Resonating RF WavesJournal of Magnetic Resonance Imaging, 2000
- Cellular electrophysiological effects of hyperthermia on isolated guinea pig papillary muscle. Implications for catheter ablation.Circulation, 1993