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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Radionuclide Testing
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pH-Sensitive Fluorine-Containing Hydrogel System for Enhanced Intestinal Computed Tomography Imaging.

Wenyu Chen1, Na Li2, Xianhe Liu3

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Summary
This summary is machine-generated.

This study developed a novel pH-sensitive hydrogel system for targeted intestinal delivery of iohexol (IOH). The system demonstrated controlled release in simulated intestinal fluid, enhancing CT contrast for better intestinal imaging.

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Area of Science:

  • Biomaterials Science
  • Radiology
  • Drug Delivery

Background:

  • Iohexol (IOH) is a nonionic contrast agent with limitations in intestinal CT imaging due to poor retention.
  • Current contrast agents face challenges with prolonged circulation and inadequate gastrointestinal retention.

Purpose of the Study:

  • To develop an intestinal-targeting system for improved oral nonionic contrast agent delivery.
  • To enhance the effectiveness of iohexol for intestinal CT imaging.

Main Methods:

  • Development of pH-sensitive hydrogels encapsulating perfluorocarbon droplets for iohexol delivery.
  • Evaluation of structural stability using temperature-responsive phase transitions.
  • Assessment of iohexol release profiles in simulated gastric (pH 1.2) and intestinal (pH 7.4) fluids.
  • Testing of cellular CT contrast enhancement and cell morphology preservation.

Main Results:

  • The hydrogel system showed minimal iohexol release (9%) in simulated gastric fluid within 60 minutes.
  • Rapid and significant iohexol release (80% in 30 minutes) was observed in simulated intestinal fluid (pH 7.4).
  • The formulation enhanced cellular CT contrast without altering cell morphology.

Conclusions:

  • The developed intestinal-targeting system effectively delivers iohexol with pH-dependent release characteristics.
  • This system shows potential as an improved oral nonionic contrast agent for diagnosing intestinal diseases.
  • Perfluorocarbon-encapsulated hydrogels offer enhanced structural stability and targeted drug release.