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Abstract #0917

Transmit Array Spatial Encoding (TRASE) with broadband WURST pulses for robust spatial encoding in inhomogeneous B0 fields

Jason P Stockmann 1,2 , Clarissa Cooley 3,4 , Mathieu Sarracanie 1,2 , Matthew S Rosen 1,2 , and Lawrence L Wald 1,4

1 A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 2 Department of Physics, Harvard University, Cambridge, MA, United States, 3 Massachusetts General Hospital, Charlestown, MA, United States, 4 Harvard Medical School, Boston, MA, United States

Transmit array spatial encoding (TRASE) uses linear phase variation in B 1 + to perform spatial encoding with spin echo trains. While early TRASE results are promising, the method suffers from artifacts in the presence of B 0 off-resonance when refocusing pulse angles deviate significantly from 180. We show that this problem can be remedied by using frequency-swept WURST RF pulses to accurately refocus all spin isochromats across a wide bandwidth. We further show a simple method to compensate for the quadratic phase imparted to half of the echoes by the frequency-swept RF pulses. TRASE-WURST could benefit applications involving highly inhomogeneous magnetic fields, such as lightweight portable MR scanners.

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