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Impedance magnetocardiography: Experiments and modeling
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the I-MCG experimental setup using a high- SQUID. The subject is positioned inside an open-ended multilayered mumetal shield (shown as a dashed line) with the SQUID and liquid-nitrogen dewar suspended over the sternum. The arms can either be positioned inside or extend outside the shield.

Image of FIG. 2.
FIG. 2.

Noise levels recorded outside (upper trace) and inside the magnetic shield (lower trace) shown up to . The shielding factors are roughly 1000 at dc, 50 at , 50 at and 2 at (SQUID measurement frequency).

Image of FIG. 3.
FIG. 3.

Low-frequency I-MCG recording obtained with a high- SQUID (upper trace) and the simultaneously recorded ECG (lower trace).

Image of FIG. 4.
FIG. 4.

Schematic of the I-MCG setup using a copper pickup coil. The subject is positioned upright in a chair outside of the magnetic shield. The coil is worn as a necklace outside of the sternum with ac injected via wrist electrodes.

Image of FIG. 5.
FIG. 5.

High-frequency I-MCG recording obtained with a copper pickup coil (upper trace) and the simultaneously recorded ECG (lower trace).

Image of FIG. 6.
FIG. 6.

Finite element mesh showing the dimensions and resistivity values of the spherical tissue blocks during the systolic phase. The horizontal axis corresponds to the axis about which the model is symmetric.

Image of FIG. 7.
FIG. 7.

(Color) Current densities calculated during the (a) systolic and (b) diastolic phases of the cardiac cycle.

Image of FIG. 8.
FIG. 8.

-component current densities plotted along a radial contour through the center of the model during the diastolic (dashed curve) and systolic (solid curve) phases. The current density varies in steps across the inner myocardial blood, myocardium, and lung interfaces.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Impedance magnetocardiography: Experiments and modeling