Med Biol Eng Comput - Adaptive removal of gradients-induced artefacts on ECG in MRI: a performance analysis of RLS filtering.

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Resumo

One of the main vital signs used in patient monitoring during Magnetic Resonance Imaging (MRI) is Electro-Cardio-Gram (ECG). Unfortunately, magnetic fields gradients induce artefacts which severely affect ECG quality. Adaptive Noise Cancelling (ANC) is one of the preferred techniques for artefact removal. ANC involves the adaptive estimation of the impulse response of the system constituted by the MRI equipment, the patient and the ECG recording device. Least Mean Square (LMS) adaptive filtering has been traditionally employed because of its simplicity: anyway, it requires the choice of a step-size parameter, whose proper value for the specific application must be estimated case by case: an improper choice could yield slow convergence and unsatisfactory behaviour. Recursive Least Square (RLS) algorithm has, potentially, faster convergence while not requiring any parameter. As far as the authors' knowledge, there is no systematic analysis of performances of RLS in this scenario. In this study we evaluated the performance of RLS for adaptive removal of artefacts induced by magnetic field gradients on ECG in MRI, in terms of efficacy of suppression. Tests have been made on real signals, acquired via an expressly developed system. A comparison with LMS was made on the basis of opportune performance indices. Results indicate that RLS is superior to LMS in several respects.

Resumo Limpo

one main vital sign use patient monitor magnet reson imag mri electrocardiogram ecg unfortun magnet field gradient induc artefact sever affect ecg qualiti adapt nois cancel anc one prefer techniqu artefact remov anc involv adapt estim impuls respons system constitut mri equip patient ecg record devic least mean squar lms adapt filter tradit employ simplic anyway requir choic stepsiz paramet whose proper valu specif applic must estim case case improp choic yield slow converg unsatisfactori behaviour recurs least squar rls algorithm potenti faster converg requir paramet far author knowledg systemat analysi perform rls scenario studi evalu perform rls adapt remov artefact induc magnet field gradient ecg mri term efficaci suppress test made real signal acquir via expressli develop system comparison lms made basi opportun perform indic result indic rls superior lms sever respect

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