Surface current density mapping for identification of gastric slow wave propagation.

Bradshaw LA, Cheng LK, Richards WO, Pullan AJ
IEEE Trans Biomed Eng. 2009 56 (8): 2131-9

PMID: 19403355 · PMCID: PMC2722927 · DOI:10.1109/TBME.2009.2021576

The magnetogastrogram (MGG) records clinically relevant parameters of the electrical slow wave of the stomach noninvasively. Besides slow wave frequency, gastric slow wave propagation velocity is a potentially useful clinical indicator of the state of health of gastric tissue, but it is a difficult parameter to determine from noninvasive bioelectric or biomagnetic measurements. We present a method for computing the surface current density from multichannel MGG recordings that allows computation of the propagation velocity of the gastric slow wave. A moving dipole source model with hypothetical as well as realistic biomagnetometer parameters demonstrates that while a relatively sparse array of magnetometer sensors is sufficient to compute a single average propagation velocity, more detailed information about spatial variations in propagation velocity requires higher density magnetometer arrays. Finally, the method is validated with simultaneous MGG and serosal electromyography measurements in a porcine subject.

MeSH Terms (11)

Algorithms Animals Electromagnetic Fields Electrophysiology Gastrointestinal Motility Humans Male Models, Biological Reproducibility of Results Stomach Swine

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