An MR Thermometry-GBHTM Hybrid Model to Determine Radiofrequency Heating Near Implanted Leads in High Field Imaging

Devashish Shrivastava¹, Ute Goerke¹, Shalom Michaeli¹, Jingeng Tian¹, Aviva Abosch¹, John T. Vaughan¹

A proton resonance frequency (PRF) shift based MR thermometry method and the newly developed generic bioheat transfer model (GBHTM) were used together as an hybrid model to determine radiofrequency (RF) heating near a deep brain stimulation (DBS) lead electrodes in 3T. The PRF shift method was used to image temperatures outside the susceptibility artifact region of the DBS lead after an SAR intensive spin echo sequence. The imaged temperatures were used as inputs to the GBHTM to determine RF heating in the artifact region near the lead. The hybrid model predicted accurate peak temperatures at the DBS electrodes.