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Abstract #2608

Considerations for Using Linear Combinations of Array Elements in B1 Mapping

Shaihan J. Malik1, David J. Larkman1, Philip G. Batchelor2, Jo V. Hajnal1

1Robert Steiner MRI Unit, Imaging Sciences Department, Hammersmith hospital, Imperial College London, London, UK; 2Division of Imaging Sciences, King's College London, UK

Accurate B1 mapping of array coils is made difficult by the large dynamic range of flip angles produced by individual coil elements. By mapping the B1 fields from linear combinations of array elements, the dynamic range can be reduced such that existing mapping techniques work more efficiently. The fields produced by individual elements are then inferred by inverting the linear transformation. We investigate the properties of different linear transformations using a single parameter model and various loading conditions in conjunction with the actual flip angle imaging B1 mapping technique.