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Updated: Jun 14, 2026
08:31
A Simplified Stepwise Approach to Echo Guidance during Percutaneous Mitral Valve Repair
Published on: October 16, 2021
Experimental MRI visible resonant prosthetic heart valves
Erwin Immel1, F J Gilbert, Andreas Melzer
1IMSaT, University of Dundee, UK.
Summary
Researchers developed a novel self-expanding artificial heart valve that minimizes MRI artifacts. This innovation enhances visualization during MRI-guided placement, improving patient outcomes.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Cardiovascular Devices
Background:
- Metal components in artificial heart valves cause significant Magnetic Resonance Imaging (MRI) artifacts.
- Susceptibility and radiofrequency (RF) artifacts hinder visualization of prosthetic heart valves during MRI.
Purpose of the Study:
- To examine current heart valve prostheses for MRI compatibility.
- To integrate resonant circuits into self-expanding heart valves for MRI-guided placement.
- To overcome MRI artifacts associated with artificial heart valves.
Main Methods:
- Commercially available heart valves were tested in MRI environments.
- Porcine heart valves were sutured into Nitinol stents and integrated with resonant circuits.
- Resonant circuits were tuned to specific MRI Larmor frequencies (1.0T, 1.5T, 3T).
Main Results:
- The developed resonant circuits successfully overcame RF artifacts from non-ferromagnetic valves and Nitinol stents.
- Enhanced MRI signal and improved visualization were achieved using low flip angles (<40).
- MRI-guided implantation of the prosthetic heart valves was facilitated.
Conclusions:
- A resonant circuit tuned to the MR tomography's Larmor frequency effectively overcomes RF artifacts.
- This technology significantly improves the visualization of prosthetic heart valves in MRI.
- The prototype self-expanding heart valve shows promise for MRI-guided procedures.
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