Translational and rotational forces on heart valve prostheses subjected ex vivo to a 4.7-T MR system.
作者： Maria-Benedicta Edwards , Roger J. Ordidge , David L. Thomas , Jeffrey W. Hand , Kenneth M. Taylor
DOI: 10.1002/JMRI.10201
关键词:
摘要: Purpose: To assess the magnetic field interactions on 60 heart valve prostheses subjected to a 4.7 T MR system. It addresses question of whether valves deemed safe at 1.5 may pose safety hazards as patients are exposed increased static fields.Materials and Methods: Ex vivo testing was performed evaluate translational rotational forces using previously described techniques.Results: Translational were detected 58 ranging from 0.5degrees 7.5degrees. Seven exhibited paramagnetic/weakly ferromagnetic behavior, 51 diamagnetic behavior. Rotational observed for 46 valves.Conclusions: Criteria used assessment expressed in terms suggest this study arc compatible with use these resonance (MR) systems fields up T.
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