Dual-pathway sequences for MR thermometry: When and where to use them
Pelin Aksit Ciris1, Cheng-Chieh Cheng2, Chang-Sheng Mei3, Lawrence P. Panych2, and Bruno Madore2
1Department of Biomedical Engineering, Akdeniz University, Antalya, Turkey, 2Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States, 3Department of Physics, Soochow University, Taipei, Taiwan
Dual-pathway sequences have been
proposed to improve the temperature-to-noise-ratio (TNR) in MR thermometry. The
present work establishes how much improvement these sequences may bring for
various tissue types. Simulation results were validated against analytical
equations, phantom and in vivo human results. PSIF-FISP thermometry allowed TNR
improvements for kidney, pelvis, spleen or gray matter, and up to 2-3 fold
reductions in TR with 20% TNR gains were achievable. Further TNR benefits are
expected for heated tissues, due to heating-related changes in relaxation
rates. In other tissue types such as liver, muscle or pancreas improvements were
observed only for short TR settings.
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