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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: J Magn Reson Imaging. 2011 May 1;33(5):1184–1193. doi: 10.1002/jmri.22530

Figure 4.

Figure 4

Demonstration of digital preprocessing of reference signals in least mean squares adaptive filtering. a: Pulse sequence diagram for multi-slice real-time SSFP showing closing sequence to store magnetization (“close”), combined slice select (black) and spoiler (gray) on slice gradient. b: Example of low-pass filtered contaminated ECG recorded simultaneously with gradient signals acquired from scanner during multi-slice real-time SSFP imaging. Circles denote spoiler gradients. c: Magnified plot showing relationship between spoiler gradients and ECG pulse artifacts. d: Corrected ECG (thick line) overlaid on ECG signal before adaptive filtering (thin line).