Cardiac Pacemakers, Icds, And Loop Recorder: Evaluation Of Translational Attraction Using Conventional ("Long-bore") And "Short-bore" 1.5- And 3.0-Tesla Mr Systems

Purpose. To evaluate magnet-related translational attraction for cardiac pacemakers, ICDs, and an insertable loop recorder in association with exposure to "long-bore" and "short-bore" 1.5- and 3.0-Tesla MR systems. Materials and methods. Fourteen cardiac pacemakers, four ICDs, and one insertable loop recorder were evaluated for translational attraction using deflection angle tests performed at the points of the highest spatial gradients for long-bore and short-bore 1.5- and 3.0-Tesla MR systems according to ASTM guidelines. Results. Deflection angles ranged from 9-90° for the long-bore and from 11-90° for the short-bore 1.5-T MR system. Deflection angles ranged from 23-90° for the long-bore and from 34-90° for the short-bore 3.0-T MR system. Three of the cardiovascular implants exhibited deflection angles≥45° (i.e., indicating that they are potentially unsafe for patients) on the long-bore and short-bore 1.5-T MR systems. Eight implants exhibited deflection angles≥45° on the long-bore 3.0-T MR system, while 14 exhibited deflection angles≥45° on the short-bore 3.0-T MR system. In general, deflection angles for these cardiovascular implants were significantly (p