Abstract #1839

Real-time diaphragm navigation using reflected power measurements from a multiple channel transmit RF coil on a human 7T

Aaron T Hess¹, Christopher T Rodgers¹, and Matthew D Robson¹

¹OCMR, University of Oxford, Oxford, United Kingdom

The reflected power of transmit RF coils is influenced by the position of the diaphragm. In this work the diaphragm position is measured in real-time for every RF pulse with a hybrid approach. The set of reflection coefficients are transformed into a diaphragm position using a series of MR diaphragm navigators at the start of the pulse sequence in a learning cycle. We demonstrate high quality respiratory gated data based on gating via this mechanism using standard SAR monitoring hardware with a real-time lag of 23ms and temporal resolution of 4.5ms.

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