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Abstract #4292

Measuring cardiac activity with a thermal noise based self-navigator

Robin Navest1,2, Stefano Mandija1,2, Stefan Zijlema1,2, Luca van Dijk1, Bjorn Stemkens1, Jan Lagendijk1, Anna Andreychenko1,3, and Cornelis van den Berg1,2
1Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2Computational Imaging Group for MRI Diagnostics & Therapy, Center for Image Sciences, UMC Utrecht, Utrecht, Netherlands, 3Research and Practical Clinical Center of Diagnostics and Telemedicine Technologies of the Moscow Department of Healthcare, Moscow, Russian Federation

The ECG signal can be disturbed by the magnetohydrodynamic effect and requires placement of ECG electrodes. The latter adds extra workload in the patient setup. Moreover, for MRI-guided radiotherapy, ECG skin electrodes will interfere with dose delivery and thus cannot be used. We propose to use the noise navigator, a passive self-navigation method based on the physiological motion-induced modulation of the thermal noise variance measured by an RF receive coil, which does not require additional hardware and is inherently synchronized with MR acquisition.

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