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Objectives Studies that assess magnetic resonance imaging (MRI) inducedradiofrequency (RF) heating of the tissue in the presence of an activeelectronic implant are mostly performed in horizontal, closed-bore scanners.Vertical, open-bore MRI systems have a 90{\deg} rotated magnet and generate afundamentally different RF field distribution in the body, yet little is knownabout the RF heating of deep brain stimulation (DBS) systems in this class ofscanners. Here, we investigated whether RF heating of DBS devices wassignificantly different in a vertical, open-bore MRI scanner compared to ahorizontal, closed-bore MRI scanner. Materials and Methods In this phantomstudy, RF heating around the lead of a commercial DBS system implanted in ananthropomorphic phantom was evaluated in a 1.2 T vertical open-bore scanner(Oasis, Fujifilm Healthcare) and a 1.5 T horizontal closed-bore scanner (Aera,Siemens Healthineers). DBS devices were implanted following 30 realistic leadtrajectories. Electromagnetic simulations were performed to assess the specificabsorption rate (SAR) of RF energy around leads with different internalstructures. Results When controlling for B1+rms, temperature increase aroundthe lead-tip was significantly lower at the vertical scanner compared to thehorizontal scanner (p-value=9.1x10-7). Electromagnetic simulations demonstratedup to a 14-fold reduction in the maximum 0.1g-averaged SAR deposited in thetissue surrounding the lead-tip in a vertical scanner compared to a horizontalscanner for leads with straight and helical internal wires. Conclusions RFexperiments and electromagnetic simulations demonstrated consistently lower RFheating and power deposition around the DBS lead-tip at the vertical scannercompared to the horizontal scanner. Our simulation results suggest that thistrend in heating may potentially extend to leads from other manufacturers.

Open-bore vertical MRI scanners generate significantly less RF heating around deep brain stimulation leads compared to horizontal scanners