Detection of Small Bowel Slow-Wave Frequencies From Noninvasive Biomagnetic Measurements

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. Subsequen...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 2009-09, Vol.56 (9), p.2181-2189
Main Authors: Erickson, Jonathan C., Obioha, Chibuike, Goodale, Adam, Bradshaw, L. Alan, Richards, William O.
Format: Article
Language:English
Subjects:
Algorithms
Animals
Biomagnetics
Electric variables measurement
Electromagnetic Fields
Electrophysiological Phenomena
Frequency measurement
Gastrointestinal Motility - physiology
Interference
Intestine, Small - physiology
Intestines
Noise measurement
Signal processing
Signal Processing, Computer-Assisted
slow wave
SOBI
SQUID
SQUID magnetometers
Superconducting device noise
Superconducting devices
Swine
wavelet transforms
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Summary: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.
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.2009.2024087