Meeting Banner
Abstract #2829

Using MR Thermometry for SAR Verification in Local PTX Applications

Klaus M. Huber1, Joerg Roland2, Johanna Schoepfer1, Stephan Biber2, Sebastian Martius1

1Corporate Technology, Siemens, Erlangen, Germany; 2Healthcare, Siemens, Erlangen, Germany

Monitoring local and global SAR is one of the major challenges on the way to the clinical use of parallel TX arrays. Usually, SAR estimations are based on numerical simulations with 3D-EM-tools which are rather sophisticated and tend to deliver erroneous results in case of unprecise inputs. PRF-based MR thermometry might be a powerful tool to determine spatial temperature maps and thus cross-check SAR simulations. The motivation of this study is to examine the feasibility and quantitative accuracy of MR thermometry for SAR and temperature monitoring of local transmit antenna arrays based on existing hardware.

Keywords

added agar agreement although amplitudes applications arrays assumed automatic automatically body bottle calorimetric carried caused channel channels check clinical coil coils combination confirms constant corporate corrected correction correspond cross cycles date deliver dependent derived diffusion discrete distinct distribution done drift drifts electronic enabling erroneous estimations evaluated evaluation examine excellent excitation feasibility fiber field frequency give good gradient gradients hardware heated heating improving in vivo independence indirect individual induced inputs inside insulated integral intensity interstitial kept knee laser least life literature local made mapping maps measured might monitoring near oliver optic outer outside pair particularly peak phantom phantoms placed positions power procedures proton protons proves pulse qualifying quantitative radius rather real receive rectangular repetition rods scanner screening segmented sensor sensors series serves several simulation simulations slightly smoothened spots step subsequent susceptibility system taken technology temperature temperatures tend therapies therapy thermal thermometry tissue together translates transmit type uniform unlike variations verification verify volume water whole