Abstract #0091
Fast SEMAC by separation of on-resonance and off-resonance signals
Daehyun Yoon 1 , Valentina Taviani 1 , Pauline Worters 2 , and Brian Hargreaves 1
1
Stanford University, Palo Alto, CA, United
States,
2
GE
Healthcare, Menlo Park, CA, United States
We present a novel acquisition and reconstruction method
to accelerate the Slice Encoding for Metal Artifact
Correction (SEMAC) sequence for MR imaging near metallic
implants. SEMAC adopted an additional encoding for
slice-select dimension to resolve the off-resonance
induced slice distortion, which severely increased the
total scan time. In this abstract, we present a fast
undersampling scheme and a simple reconstruction
algorithm exploiting that the support of the extreme
off-resonance spins is spatially limited. Our approach
is to acquire on-resonance spins using less slice
directional encoding and then to apply reduced FOV
acquisition and reconstruction for off-resonance spins.
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