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BP: Fachverband Biologische Physik

BP 16: SYMM: Magnetism and Medicine

BP 16.6: Hauptvortrag

Mittwoch, 24. März 2010, 12:00–12:30, H1

SQUIDs for Noninvasive Magnetogastrography — •Alan Bradshaw^{1, 2}, Leo Cheng³, Andrew Pullan³, and William Richards⁴ — ¹Vanderbilt University, Nashville, TN — ²Lipscomb University, Nashville, TN — ³Auckland University, Auckland, NZ — ⁴University of South Alabama, Mobile, AL

The magnetogastrogram (MGG) and magnetoenterogram (MENG) have been studied over the past 20 years to assess digestive and motility issues in the stomach and small bowel. While the electrogastrogram (EGG) is capable of measuring frequency dynamics of the stomach's electrical activity, spatiotemporal analyses afforded by multichannel magnetogastrography may prove critical to the assessment of stomach disorders such as gastroparesis. Our recent results from MGG measurements and modeling suggest differences in gastric slow wave propagation between normal controls and diabetic gastroparetics. The electroenterogram (EENG) is not readily recordable in most subjects because of the intervening fat layers, but the MENG is less susceptible to volume conduction effects because of the relative similarity of the magnetic susceptibility of tissue and air. Mesenteric ischemia is a potentially deadly disease characterized by dysrhythmias of the intestinal electrical activity. These dysrhythmias can be detected in the MENG, and our recent studies are investigating the threshold at which effects can be discerned.