Key result
4.7 T MR exposure suggests safe compatibility for heart valve prostheses with minimal translational forces.
Why the study?
Are heart valve prostheses safe when exposed to a 4.7 T MR system?
Are heart valve prostheses safe when exposed to a 4.7 T MR system?
Heart valve prostheses deemed safe at 1.5 T appear to remain safe when exposed to 4.7 T MR systems based on ex vivo force testing.
PURPOSE: To assess the magnetic field interactions on 60 heart valve prostheses subjected to a 4.7 T MR system. It addresses the question of whether heart valves deemed safe at 1.5 T may pose safety hazards as patients are exposed to increased static magnetic fields. MATERIALS AND METHODS: Ex vivo testing was performed to evaluate translational and rotational forces on 60 heart valves using previously described techniques. RESULTS: Translational forces were detected on 58 heart valves ranging from 0.5 degrees to 7.5 degrees. Seven valves exhibited paramagnetic/weakly ferromagnetic behavior, and 51 valves exhibited diamagnetic behavior. Rotational forces were observed for 46 valves. CONCLUSIONS: Criteria previously used for safety assessment of heart valve prostheses and expressed in terms of magnetic forces suggest the forces observed in this study are compatible with the safe use of these valves in magnetic resonance (MR) systems with static fields up to 4.7 T.
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Edwards et al. (2002) studied Heart valve prostheses (n=60). 4.7 T MR system was evaluated on Translational and rotational forces. Exposure of 60 heart valve prostheses to a 4.7 T MR system resulted in translational forces ranging from 0.5 to 7.5 degrees, suggesting compatibility with safe use in static fields up to 4.7 T.
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