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Abstract #2540

Patient Study of Realtime Magnetic Resonance Temperature Monitoring on Moving Organ Simultaneous to Laserinduced Thermal Therapy (LITT)

Antje Kickhefel1, Christian Rosenberg1, Joerg Roland2, Norbert Hosten1

1Ernst-Moritz-Arndt University, Greifswald, Germany; 2Siemens, Erlangen, Germany

MR thermometry based on the proton resonance frequency (PRF) was performed simultaneously to laserinduced thermotherapy (LITT) of liver tumors of free breathing patients. A temperature region (>55C) was segmented in realtime images (2D-GRE) at the end of LITT. This segmented area was compared to the necrosis from 24 hours follow-up treatment (T1-weigthed 2D-FLASH). Registration between temperature imaging and follow-up was verified by segmentation of the entire liver with an averaged error of 5%. The temperature visualization overestimated/underestimated the necrosis with 12%/10%.