Fast SEMAC by separation of on-resonance and off-resonance signals

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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