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Related Experiment Videos

Dextran magnetite as a liver contrast agent.

R L Magin1, G Bacic, M R Niesman

  • 1Department of Electrical and Computer Engineering, University of Illinois, Urbana 61801.

Magnetic Resonance in Medicine
|July 11, 1991
PubMed
Summary

Dextran magnetite, a superparamagnetic particle, enhances liver tumor imaging by altering MRI relaxation times. It selectively accumulates in liver and spleen macrophages, improving tumor contrast without affecting tumor relaxation.

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Area of Science:

  • Biomedical Engineering
  • Radiology
  • Materials Science

Background:

  • Superparamagnetic iron oxide nanoparticles are explored as contrast agents for magnetic resonance imaging (MRI).
  • Dextran magnetite, a specific type of superparamagnetic particle, has potential for liver tumor detection.

Purpose of the Study:

  • To evaluate dextran magnetite as a liver tumor contrast agent for MRI.
  • To investigate its effects on T1 and T2 relaxation times in liver, spleen, and liver tumors.
  • To assess its potential for improving tumor visualization.

Main Methods:

  • Dextran magnetite was administered to rats with implanted liver tumors at varying doses.
  • Longitudinal (T1) and transverse (T2) relaxation times were measured in liver, spleen, and tumor tissues at 0.47 T.

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  • Histological analysis using Prussian blue staining identified particle distribution.
  • T1- and T2-weighted spin-echo and gradient-echo MRI images of tumors were acquired at 0.50 T.

    • Main Results:

    • Dextran magnetite significantly reduced T2 relaxation times in the liver and spleen, but not in the tumor.
    • T1 relaxation times were reduced more in the spleen than in the liver; tumor T1 was unaffected.
    • Histology confirmed dextran magnetite uptake by macrophages in the liver and spleen, with no tumor presence.
    • Improved tumor-to-liver contrast was observed in both T1- and T2-weighted MRI images post-injection.
    • Gradient-echo imaging provided good contrast in shorter acquisition times.

    Conclusions:

    • Dextran magnetite acts as a superparamagnetic MRI contrast agent due to selective uptake by liver and spleen macrophages.
    • Its differential effect on relaxation times between normal tissue and tumor provides a basis for enhanced liver tumor imaging.
    • The agent demonstrates significant potential for improving the detection and visualization of liver tumors using MRI.