Transmission line for improved RF safety of interventional devices
- 20 June 2005
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Medicine
- Vol. 54 (1), 182-189
- https://doi.org/10.1002/mrm.20543
Abstract
A new concept is proposed to improve the safety of transmission lines with respect to heating during RF transmission. It is based on the integration of transformers into the transmission line. The concept was applied to an active tracking device. Miniature transformers were designed, and two types of tracking devices were built based on a standard line and a transformer line. Temperature measurements were performed for both devices during high specific absorption rate (SAR) scanning, and the suppression of RF heating to a physiologically non‐relevant level was demonstrated for the transformer device. The transmission properties of the transformer line were examined in simulations and RF measurements. Active tracking with the transformer device performed robustly in the phantom. Because of the favorable signal transmission properties of the tested device, it is expected that the concept can be applied to the construction of clinical devices for tracking and intravascular imaging, which are RF‐safe under clinical SAR conditions. Since the transformer line has a large bandwidth, the concept may also be applied for RF‐safe transmission of non‐MR signals. Magn Reson Med 54:182–189, 2005.Keywords
This publication has 20 references indexed in Scilit:
- Initial experiences with in vivo intravascular coronary vessel wall imagingJournal of Magnetic Resonance Imaging, 2003
- A rapid 2D time‐resolved variable‐rate k‐space sampling MR technique for passive catheter tracking during endovascular proceduresMagnetic Resonance in Medicine, 1998
- Visualization of dedicated catheters using fast scanning techniques with potential for MR‐guided vascular interventionsMagnetic Resonance in Medicine, 1996
- High resolution intravascular MRI and MRS by using a catheter receiver coilMagnetic Resonance in Medicine, 1996
- Towards active guidewire visualization in interventional magnetic resonance imagingMagnetic Resonance Materials in Physics, Biology and Medicine, 1996
- Intravascular MR imaging in a porcine animal modelMagnetic Resonance in Medicine, 1994
- Vascular interventions guided by ultrafast MR imaging: Evaluation of different materialsMagnetic Resonance in Medicine, 1994
- Real‐time position monitoring of invasive devices using magnetic resonanceMagnetic Resonance in Medicine, 1993
- Intravascular (catheter) NMR receiver probe: Preliminary design analysis and application to canine iliofemoral imagingMagnetic Resonance in Medicine, 1992
- Magnetic Susceptibility Effects and Their Application in the Development of New Ferromagnetic Catheters for Magnetic Resonance ImagingInvestigative Radiology, 1990