Abstract
During in vitro tests, we exposed seven mechanical cardiac valves to a 1.5 Tesla magnetic field and measured their deflection and temperature changes during a gradient-echo sequence. We used a special suspension system which indicated and measured the largest deflection at the entrance to the tube and any deflections within the gradient field. A temperature sensor measured changes in temperature in the valve ring in both air and in a water bath during exposure to a high-frequency field. The Bjork-Shiley (Shiley Irvine, CA, USA) valve displayed the most deflection at the entrance to the coil, namely 1.8 mm. All the other valve models displayed less deflection. No deflection took place during gradient-echo sequences. Three valve models displayed an increase in valve ring temperature. The Medtronic valve displayed the largest increase with 0.6°C.
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