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The workflow of training (left) and real-time processing (right) stages. The signal processing performed to remove the gradient-induced voltages consisted of two stages. A training stage followed by real-time induced-voltage removal during image acquisition with continuous display of restored ECG traces. *The FIR filter cut-off frequency was above 500Hz or above 200Hz for ECGs acquisition with Set-up I or II respectively, and has a group delay <5ms.
