The strength of the static magnetic field produced by a MR system varies with the distance from the scanner. This generates a magnetic field spatial gradient (SG) which produces an attractive translational force on ferromagnetic objects that approach the system. Because the SG has bearing on patient safety related to implanted medical device, it is essential to understand the field distribution of novel magnets, since each design has its own unique SG pattern. We performed on-site evaluation of the magnetic field SG for a novel high-performance compact 3T MR scanner to ensure patient safety during the subsequent clinical trial.
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