title: Nonlinear bayesian filtering for denoising of electrocardiograms acquired in a magnetic resonance environment.
abstract: ECGs are currently acquired during magnetic resonance examinations. This "hostile" environment highly distorts ECG signals, due to the high-static magnetic field, RF pulses and fast switching magnetic gradients. Specific signal processing is then required since the ECG signal is used for image synchronization with heart activity (or triggering) and for patient monitoring. A new set of two magnetic field gradient (MFG) artifact reduction methods, based on ECG and MFG artifact modelings and Bayesian filtering, is herein presented and will be called Bayesian gradient artifact reduction monitoring (BAGARRE-M) and BAGARRE-triggering. These algorithms overcome the limitations of state-of-the-art methods and enable accurate processing of very noisy ECG acquisitions during MRI. Whether for triggering or monitoring purposes, the presented methods overcome state-of-the-art techniques with both better QRS detection accuracy and signal denoising quality.
authors.affiliation: Interventional and Diagnostic Adaptive Imaging Laboratory, Nancy Université, F-54000 Nancy, France. j.oster@chu-nancy.fr
authors.forename: Julien
authors.initials: J
authors.lastname: Oster
authors.forename: Olivier
authors.initials: O
authors.lastname: Pietquin
authors.forename: Michel
authors.initials: M
authors.lastname: Kraemer
authors.forename: Jacques
authors.initials: J
authors.lastname: Felblinger
mesh_terms: D000328:Adult; D000465:Algorithms; D016477:Artifacts; D001499:Bayes Theorem; D016208:Databases, Factual; D004562:Electrocardiography / Q000379:methods*; D004574:Electromagnetic Fields; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D017711:Nonlinear Dynamics; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted