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SLIME: robust, high-speed 3D microvascular mapping.

Yehe Liu1, Meredith C G Broberg2,3, Michiko Watanabe2

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, USA.

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Summary
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We developed a low-cost method using optical clearing and a novel contrast agent to improve optical coherence tomography (OCT) imaging depth. This enables fast 3D microvascular mapping in large tissue volumes for disease research.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Optical Physics

Background:

  • Three-dimensional (3D) microvascular imaging of large tissue volumes is crucial for understanding organ-level physiology and disease.
  • Current methods for 3D microvascular imaging using optical coherence tomography (OCT) are often time-consuming and require expensive equipment, limiting their application in large-scale studies.

Purpose of the Study:

  • To develop a cost-effective and simplified approach to significantly extend the imaging depth of OCT in excised tissues.
  • To enable fast and high-resolution 3D microvascular mapping in centimeter-scale tissue volumes.

Main Methods:

  • Combined tissue optical clearing techniques with a novel scatter-based contrast agent for optical coherence tomography (OCT).
  • Evaluated the enhanced imaging depth and speed of the new method in excised tissues.
  • Demonstrated the capability for 3D microvascular mapping in large tissue volumes.

Main Results:

  • Successfully extended the imaging depth of OCT in excised tissues significantly.
  • Achieved fast 3D microvascular mapping in large tissue volumes (cubic millimeter to centimeter scale).
  • The developed method is simple, low-cost, and does not require specialized OCT expertise.

Conclusions:

  • The novel approach of combining optical clearing with a scatter-based OCT contrast agent offers a powerful and accessible tool for deep tissue microvascular imaging.
  • This technique facilitates rapid 3D microvascular mapping in large tissue volumes, paving the way for investigating organ-level microvascular abnormalities in extensive research cohorts.