Parallel transmission to date is the most promising technology to tackle the RF field inhomogeneity problem in MRI at ultra-high field. The Virtual Observation Point compression technique was a cornerstone in the field to reduce drastically the number of SAR matrices to handle in exam supervision and RF pulse design. After its original discovery, it was further improved to boost the compression. This work describes a reformulation of the problem which simplifies substantially the numerical search and allows reducing further the number of matrices by a factor ~5 or more.
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