Detection of small bowel slow-wave frequencies from noninvasive biomagnetic measurements.

Erickson JC, Obioha C, Goodale A, Bradshaw LA, Richards WO
IEEE Trans Biomed Eng. 2009 56 (9): 2181-9

PMID: 19497806 · PMCID: PMC2760223 · DOI:10.1109/TBME.2009.2024087

We report a novel method for identifying the small intestine electrical activity slow-wave frequencies (SWFs) from noninvasive biomagnetic measurements. Superconducting quantum interference device magnetometer measurements are preprocessed to remove baseline drift and high-frequency noise. Subsequently, the underlying source signals are separated using the well-known second-order blind identification (SOBI) algorithm. A simple classification scheme identifies and assigns some of the SOBI components to a section of small bowel. SWFs were clearly identified in 10 out of 12 test subjects to within 0.09-0.25 cycles per minute. The method is sensitive at the 40.3 %-55.9 % level, while false positive rates were 0 %-8.6 %. This technique could potentially be used to help diagnose gastrointestinal ailments and obviate some exploratory surgeries.

MeSH Terms (8)

Algorithms Animals Electromagnetic Fields Electrophysiological Phenomena Gastrointestinal Motility Intestine, Small Signal Processing, Computer-Assisted Swine

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