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Related Concept Videos

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Gastric Motility01:16

Gastric Motility

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Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
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Video Imaging and Spatiotemporal Maps to Analyze Gastrointestinal Motility in Mice
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Dynamic Magnetic Resonance Imaging of Whole-Stomach Motility in Rats.

Xiaokai Wang1, Ulrich M Scheven2, Zhongming Liu1,3

  • 1Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA.

NMR in Biomedicine
|September 10, 2025
PubMed
Summary

This study introduces a novel, non-invasive MRI protocol for visualizing rodent gastric dynamics. The advanced technique accurately captures stomach motility, crucial for neurogastroenterology research.

Keywords:
contrast‐enhancementdynamic MRIgadoliniumpreclinicalratstomach

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Area of Science:

  • Biomedical Engineering
  • Gastroenterology
  • Medical Imaging

Background:

  • Preclinical neurogastroenterology research relies on understanding rodent gastric physiology.
  • Current methods for studying gastric function are often invasive, terminal, or lack sufficient resolution.
  • There is a need for non-invasive, high-resolution techniques to assess gastric dynamics in vivo.

Purpose of the Study:

  • To develop and standardize a non-invasive MRI protocol for capturing whole-stomach dynamics in anesthetized rats.
  • To achieve high spatiotemporal resolution for detailed analysis of gastric motility.
  • To provide a robust tool for preclinical gastrointestinal motility research.

Main Methods:

  • Utilized a 7-T MRI system with a modified multi-slice gradient-echo sequence.
  • Developed a gadolinium-doped test meal for enhanced intraluminal contrast in T1-weighted MRI.
  • Integrated respiratory gating, spatial saturation, and slice grouping for motion artifact reduction and improved contrast.
  • Employed time-interleaved k-space undersampling accelerated with k-t interpolation for image reconstruction.

Main Results:

  • Successfully imaged the stomach and visualized quasi-periodic dynamics in anesthetized rats.
  • Gadolinium contrast allowed clear delineation of gastric anatomy, volume, and motility.
  • The k-t interpolation method proved effective and robust, yielding reliable estimates of antral contractions.
  • High image quality was achieved with an effective temporal resolution of <3s, capturing antral contractions at ~5 cycles per minute.

Conclusions:

  • An accessible, standardized, and non-invasive MRI protocol for dynamic gastric imaging in rodents was established.
  • The protocol enables comprehensive assessment of gastric motility and dysmotility in preclinical models.
  • This technique holds significant potential for advancing gastrointestinal motility research.