Figure 4

RTS design in human body model.

(a) X-Ray image of a patient with implanted bilateral DBS system. A head holder, the implantable pulse generator (IPG) in the thorax and the two leads are visible. (b) Anatomical model of a human body with implanted DBS lead used for numerical simulations. (c) Model of the human body inside the RF body coil. (d) Model of the lead, including the lumen (A), the four RTS wires (B), the four electrodes numbered as in the Medtronic 3389 (i.e., 0 – 3) (C) and the insulation (D). (e) Graph showing the results of analysis of 10 g-avg. SAR reduction with respect to different RTS configurations (i.e., from two to six sections.) (f) Numerical simulation results showing a coronal view of power absorption in the human body model without implant (left), with PtIr lead (middle) and with RTS lead (right). The increase of power near the electrode for the PtIr lead is clearly visible. By contrast, the RTS wire is “RF-transparent” to the RF field (i.e., is the map is similar to the case without the lead). (g) Sagittal view of the same results.