Simulation of elevated T-waves of an ECG inside a static magnetic field (MRI)

    Authors

    A. Gupta; A. R. Weeks;S. M. Richie

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Biomed. Eng.

    Keywords

    ECG; MRI; simulation package; ST segment; T-wave elevation; BLOOD-FLOW; THEORETICAL-ANALYSIS; Engineering, Biomedical

    Abstract

    In MRI, the flow of blood in the patient is subjected to a strong static magnetic field (B(0)). The movement of charge carriers in a magnetic field causes a magnetofluid dynamic (MFD) effect that induces a voltage across the artery. This induced voltage distorts the ECG signal of the patient and appears as an elevation of the T-wave of the ECG signal. Flow of blood through the aortic arch is perpendicular to the magnetic-field and coincides with the occurrence of the T-wave of the ECG. Based on these facts, it is proposed that the elevation in the T-wave occurs because of the voltage induced across the aortic arch. In this paper, the elevation is computed mathematically using the equations of MFD. A method is developed to measure this induced voltage based on discretization of the aortic arch and measuring the blood flow profile in the aorta. The results are compared to the ECG signals measured in humans in the bore of 1.5 T imaging magnet. The computed ECG signals at the 12 leads are very similar to the measured values.

    Journal Title

    Ieee Transactions on Biomedical Engineering

    Volume

    55

    Issue/Number

    7

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    1890

    Last Page

    1896

    WOS Identifier

    WOS:000257138800013

    ISSN

    0018-9294

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