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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