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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