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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