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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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How to Build a Laser Speckle Contrast Imaging (LSCI) System to Monitor Blood Flow
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Published on: November 11, 2010

A miniaturized platform for laser speckle contrast imaging.

Janaka Senarathna1, Kartikeya Murari, Ralph Etienne-Cummings

  • 1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA. dsenara1@jhu.edu

IEEE Transactions on Biomedical Circuits and Systems
|July 16, 2013
PubMed
Summary

Scientists developed a miniaturized head-mountable microscope for imaging awake, unrestrained rats. This novel device enables high-resolution brain vasculature and perfusion imaging, advancing behavioral neuroscience research.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Current animal brain imaging methods often require anesthesia and immobilization, limiting behavioral studies.
  • Existing techniques use bulky equipment, restricting in-vivo imaging possibilities.
  • There is a need for imaging systems that allow observation of brain activity in naturalistic conditions.

Purpose of the Study:

  • To develop and validate a miniaturized, head-mountable microscope for imaging the brains of awake, unrestrained rats.
  • To enable high-resolution imaging of cerebral vasculature and perfusion using laser speckle contrast imaging (LSCI).
  • To assess the impact of the device on natural rat behavior.

Main Methods:

  • Designed and constructed a compact microscope system (7g, <5 cm³) for head-mounting on rats.
  • Employed laser speckle contrast imaging (LSCI) for wide-field, high-resolution imaging.
  • Utilized Monte Carlo simulations for tissue penetration depth estimation and Fresnel diffraction for speckle pattern simulation.

Main Results:

  • Successfully acquired proof-of-concept LSCI images of rat brain vasculature.
  • Demonstrated the system's capability for imaging blood flow and perfusion in awake, unrestrained subjects.
  • Validated that the head-mountable microscope did not impede the rat's native behavior.

Conclusions:

  • The developed miniaturized microscope offers a non-invasive tool for brain imaging in awake, unrestrained animal models.
  • This technology significantly expands the scope of behavioral neuroscience research by allowing in-vivo imaging during natural activities.
  • The system provides high-resolution visualization of cerebral vasculature and perfusion, crucial for understanding brain function.