Parallel transmission (PTx) is a valuable tool for UHFMRI, but complicates SAR monitoring considerably. The Virtual Observation Point (VOP) algorithm has been crucial in enabling online SAR monitoring during PTx. To date, PTx has only been applied for proton, but as static field strengths continue to increase it becomes interesting to apply PTx methods for other nuclei. This abstract investigates how to apply the VOP algorithm to a transmit array operating at more than one frequency.
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