MR compatible sensor array for cardiac imaging and endocavitary electric mapping

Abstract : The electrocardiogram (ECG) is used to measure heart electrical activity. It has been used during Magnetic Resonance Imaging (MRI) examinations for several decades to improve patient monitoring and synchronize image acquisition. Nevertheless, this technique is performed using electronic devices with a low bandwidth and a limited number of electrodes that do not provide a diagnostic signal quality. Indeed, a diagnostic ECG requires a wide bandwidth (0.05 - 150 Hz) and 10 measuring electrodes that allow 12 leads to be acquired. MRI is characterized by an environment with an intense static magnetic field, high frequency and low frequency dynamic electromagnetic fields. The design and development of an MRI-compatible ECG sensor needs to take into account this environment to reduce the risk of overheating of the device during image sequences and to reduce disturbances on the measured signals. The use of devices with short cables reduces the risk of overheating by antenna effect, which ensures patient safety, but the induction of noise on the signals is inevitable. This thesis is organized in five parts. The first two parts were oriented towards the study of the literature and the design of a new sensor prototype with a broad bandwidth of ECG. The objective was to develop a device with sufficient computing power to integrate the signal processing algorithms developed by the IADI laboratory, to eliminate the noise superimposed on the signals. The third part was dedicated to the construction of a sensor network from N sensors. The goal was to multiply the number of measurement electrodes to increase the spatial resolution of the ECG and reconstruct a 12-lead ECG during MRI examination. The purpose of this work is noninvasive ECG imaging from surface electrical potential maps and from anatomical models of patients obtained simultaneously by MRI. The fourth part presents a new method of real-time correction of ECG signals from a high frequency sampling acquisition, based on the device developed. The fifth and last part presents another application of this sensor in the interventional electrophysiology room, during the activation of a Magnetic Navigation System of the catheter, which generates disturbances similar to those observed in MRI.
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https://hal.univ-lorraine.fr/tel-02397885
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Submitted on : Friday, December 6, 2019 - 5:17:00 PM
Last modification on : Monday, December 9, 2019 - 3:08:13 PM

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  • HAL Id : tel-02397885, version 1

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Jesús Enrique dos Reis Sánchez. MR compatible sensor array for cardiac imaging and endocavitary electric mapping. Human health and pathology. Université de Lorraine, 2019. English. ⟨NNT : 2019LORR0107⟩. ⟨tel-02397885⟩

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