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Related Experiment Video

Updated: May 1, 2026

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Solid MRI contrast agents for long-term, quantitative in vivo oxygen sensing.

Vincent H Liu1, Christophoros C Vassiliou, Syed M Imaad

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|April 23, 2014
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Summary

This study introduces a novel, injectable MRI contrast agent using a responsive material within a polymer matrix. This new agent offers stable, long-term in vivo imaging with minimal tissue reaction, improving chronic disease monitoring.

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implantable sensorsmolecular imaging

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiology

Background:

  • Targeted MRI contrast agents are valuable for research and clinical imaging of biomarkers.
  • Limited applicability in serial imaging due to concentration changes post-injection.
  • Existing solid enclosures require surgical implantation, restricting use.

Purpose of the Study:

  • To develop a novel class of MRI contrast agents with stable, injectable properties.
  • To create an oxygen-sensitive contrast agent for improved serial imaging.
  • To assess the in vivo stability and tissue compatibility of the new agent.

Main Methods:

  • Designed an injectable contrast agent using dodecamethylpentasiloxane (responsive material) and polydimethylsiloxane (matrix).
  • Utilized a rodent inspired-gas model for in vivo evaluation.
  • Assessed functional stability, tissue reactions, and migration over time.

Main Results:

  • The novel contrast agent demonstrated functional stability in vivo for at least 1 month.
  • Achieved an order of magnitude improvement in stability compared to liquid siloxane injections.
  • Observed minimal adverse tissue reactions and no significant migration from the injection site.

Conclusions:

  • This new class of contrast agents offers a stable and injectable solution for MRI.
  • The agent's long-term in vivo stability and biocompatibility are significant advancements.
  • Represents a complementary method for monitoring chronic diseases using MRI.