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Optimal Agents for Visualizing Collagen Tissue Microarchitecture Using Contrast-Enhanced MicroCT.

Spencer B Glancy1, Herman Douglas Morris2, Vincent B Ho2,3

  • 1San Antonio Uniformed Services Health Education Consortium, San Antonio, TX 78234, USA.

Pharmaceuticals (Basel, Switzerland)
|December 23, 2023
PubMed
Summary

Contrast agents are crucial for visualizing collagenous tissues with micro-computed tomography (microCT). This review compares agents, finding Lugol

Keywords:
Lugol’sMicroCTcollagencontrast agentphosphotungstic acid

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Area of Science:

  • Biomedical Imaging
  • Materials Science
  • Biotechnology

Background:

  • Micro-computed tomography (microCT) is vital for internal tissue visualization.
  • Collagen, a key structural protein, is challenging to image due to low X-ray attenuation.
  • Collagen type I is essential in tissue engineering and bioprinting applications.

Purpose of the Study:

  • To review and compare contrast-enhanced techniques for microCT visualization of collagenous tissues.
  • To identify ideal characteristics for microCT contrast agents for collagen.

Main Methods:

  • Literature review of various contrast-enhanced techniques for microCT imaging of collagen-based tissues.
  • Evaluation of contrast agents based on diffusion rate, object integrity, and image contrast.
  • Comparison of specific agents including Lugol's solution, phosphotungstic acid, mercury(II) chloride, and Wells-Dawson polyoxometalates.

Main Results:

  • No single contrast agent perfectly meets all ideal criteria for microCT imaging of collagen.
  • Lugol's solution, phosphotungstic acid, mercury(II) chloride, and Wells-Dawson polyoxometalates showed promise.
  • Each agent has distinct advantages and disadvantages influencing its suitability for specific applications.

Conclusions:

  • Effective microCT visualization of collagenous tissues requires specialized contrast agents.
  • The selection of a contrast agent depends on laboratory capabilities and specific imaging goals.
  • Further development is needed to achieve ideal contrast agents for collagen imaging.