Contactless cardiac triggering using Pilot Tone was initially demonstrated for steady-state triggered cine-type sequences that, per definition, are performed with continuous, uniform RF pulses. Here we describe a method that stabilizes Pilot Tone cardiac triggering in the presence of RF artefacts, thereby allowing for pilot tone triggering of complete cardiac MR examinations with a range of sequence flavors including those applying RF pulses intermittently. The method uses an additional RF calibration measurement and avoids the RF artefact subspace in a PCA-based multi-channel coil combination calculation. Signal examples at 1.5T demonstrate effective RF suppression.
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