Title :
The vector magnetic field of the human stomach and small bowel
Author :
Bradshaw, L.A. ; Ladipo, J.K. ; Wikswo, J.P., Jr. ; Richards, W.O.
Author_Institution :
Dept. of Phys. & Astron., Vanderbilt Univ., Nashville, TN, USA
fDate :
30 Oct-2 Nov 1997
Abstract :
The authors recorded the vector biomagnetic field associated with gastrointestinal electrical activity in nine positions around the abdomen of 10 normal human volunteers using a vector SQUID magnetometer. Gastric activity with a frequency of 3.03±0.18 cpm (mean ±SEM) was recorded with the magnetometer in the epigastrium. Small intestinal activity was also recorded in all abdominal positions with a frequency ranging between 9.0±0.43 cpm in the lower abdomen to 10.5±0.28 cpm in the upper abdomen. Different components of GI activity were evident within single magnetic field recordings. These different components could be elucidated by examining different projections of the magnetic field vector These studies further demonstrate the ability of the SQUID magnetometer to detect gastrointestinal activity and also illustrate how different signal components associated with gastric and small intestinal activity may be separated
Keywords :
SQUID magnetometers; biological organs; biomagnetism; magnetic field measurement; vectors; epigastrium; gastric activity; human stomach; lower abdomen; normal human volunteers; small bowel; upper abdomen; vector magnetic field; Abdomen; Biomagnetics; Frequency; Gastrointestinal tract; Humans; Intestines; Magnetic fields; Magnetic recording; SQUID magnetometers; Stomach;
Conference_Titel :
Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-4262-3
DOI :
10.1109/IEMBS.1997.756800