Magnetic resonance imaging in patients with spinal neurostimulation systems. After the exam, MRI-mode should be turned off and settings returned to pre-MRI values. ĭe Andres J, Valía JC, Cerda‐Olmedo G et al. Visual and auditory monitoring should be continuously performed during the scan. The patient must be in a cognitive state able to provide immediate feedback concerning any problems during the examination. For several models there are restrictions on the use of transmit body coils and power deposition limits dependent on the location of magnet isocenter. Limits for maximum spatial gradient, gradient slew rate, total imaging time, and RF power dissipation measured by average SAR or maximum B 1+RMS must be followed explicitly. These conditions will vary significantly between manufacturers and SCS models. All current MR-conditional SCS devices are restricted to ¹H imaging in horizontal bore cylindrical magnets operating at 1.5 or 3.0T. Only the supine or prone patient positions are allowed. The IPG should be turned off or placed in "MRI Mode" if available. The IPG battery should be fully charged and lead impedances should measure within expected values. Pre-MRI evaluation/interrogation of the DBS system.Insure that the wires are connected to the IPG without breaks and there are no abandoned leads or electrodes. Verify (by x-ray if necessary) that the IPG has been implanted subcutaneously in the pelvis/flank. This can be done by reviewing operative notes from the medical record or the patient's information card. The exact model/serial numbers from the various components of the SCS system, including the IPG, leads, and extensions (if present) must be established with certainty.
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