Differences in RF-induced Heating per unit of SAR of a Deep Brain Stimulation Implant Across Two MR Systems
Baker K, Tkach J, Rezai A
Cleveland Clinic Foundation
The specific absoprtion rate (SAR) is often used as the metric for applied RF power in safety recommendations for performing MRI procedures in patients with elongated, conductive implants. However, no universally standardized method of determining SAR has been adopted by the MR manufacturers. Using a phantom model, we demonstrated substantial diferences in the heating profile of an fully implanted neurostimlation system between two different 1.5T MR scanners using a t/r head coil configuration, the configuration that complies with the FDA approved labeling for MRI safety guidelines associated with implant system evaluated.