ECG recording during whole heart MR imaging requires extra setup time and is not always reliable. Recently, self-gated (SG) acquisition techniques have been developed, which extract the cardiac signal from k-space center amplitude modulations. Here, we investigated whether different single- (Empirical Mode Decomposition (EMD), Ensemble EMD (EEMD)) and multi-coil (PCA, ICA with novel stabilisation) decomposition methods yielded SG triggers with minimal variability to ECG R-wave location. EEMD yielded median variability similar to PCA. Compared to PCA, our proposed stabilised ICA approach yielded SG triggers with 66% lower variability (median over 5 subjects), although not for all subjects.
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