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Abstract #1906

Using a Spherically Distributed Spirals Trajectory to Collect Coil Sensitivity Maps for Iterative SENSE Reconstruction

Le Zhang1, Tzucheng Chao1, Dinghui Wang1, Guruprasad Krishnamoorthy2, and James Pipe1
1Radiology, Mayo Clinic, Rochester, MN, United States, 2MR R&D, Philips Healthcare, Rochester, MN, United States


Conventionally, Cartesian pre-scans are collected over several seconds to create accurate coil sensitivity maps (CSM) for SENSE reconstruction of under-sampled MRI data, with body-coil images used for signal normalization. Since body coils have a larger sensitivity region than phased-array coils, these pre-scans typically employ a very large field-of-view (FOV) to avoid aliasing, leading to low-resolution CSM and potential small errors in subsequent reconstructions. This abstract proposes a new CSM pre-scan sequence using a spherically-distributed-spirals trajectory. The acquisition efficiency and incoherent aliasing offered by this trajectory allow for smaller FOV and higher resolution while maintaining similar scanning time as conventional pre-scans.

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