BAYESIAN FRAMEWORK FOR ARTIFACT REDUCTION ON ECG IN MRI

Electrocardiogram (ECG) is required during Magnetic Resonance Imaging (MRI) for two reasons, patient monitoring and MRI se-quence synchronization for cardiovascular imaging. The MRI en-vironment severely distorts ECG signals. The Magnetic Field Gra-dients (MFG) especially induce artifacts, which make ECG analysis during MRI acquisition challenging. Specific signal processing is thus required. An MFG artifact modeling has been proposed for their suppression. However the resulting techniques do not take the ECG signals into account during the model parameter estimation. Recently, ECG denoising based on an artificial ECG model and non-linear Bayesian filtering has been presented. In this paper, a new MFG artifact suppression method based on nonlinear Bayesian fil-tering and the unification of the ECG and MFG models is proposed. This new approach enables accurate patient monitoring and outper-forms state-of-the-art methods in terms of both QRS detection qual-ity and signal to noise ratio