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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...

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Real-Time Monitoring of Neurocritical Patients with Diffuse Optical Spectroscopies
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Diffuse optical imaging of the whole head.

Maria Angela Franceschini1, Danny K Joseph, Theodore J Huppert

  • 1Massachusetts General Hospital, Athinoula A. Martinos Center for Biomedical Imaging, 13th Street, Bldg. 149 (RM 2301), Charlestown, Massachusetts 02129, USA. mari@nmr.mgh.harvard.edu

Journal of Biomedical Optics
|November 10, 2006
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Summary

This study introduces a new whole-head diffuse optical imaging system for brain activity monitoring. The enhanced system improves detection of hemodynamic changes and understanding of physiological signals.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Optical Imaging

Background:

  • Near-Infrared Spectroscopy (NIRS) and diffuse optical imaging (DOI) are vital for detecting brain hemodynamic changes.
  • Limited optodes in previous NIRS systems restricted measurements to specific brain regions.
  • Understanding physiological signal interference is crucial for accurate brain activity detection.

Purpose of the Study:

  • To introduce a novel 32-source, 32-detector diffuse optical imaging system for whole-head brain coverage.
  • To characterize the system's performance using phantoms and human subjects.
  • To explore spatiotemporal patterns of physiological signals and their impact on brain activation measurements.

Main Methods:

  • Development and implementation of a 32-source, 32-detector DOI system.
  • System characterization using optical phantoms.
  • Data acquisition from human subjects at rest and during various stimulations (visual, motor, cognitive).
  • Analysis of spatiotemporal patterns of physiological signals (cardiac, respiratory, blood pressure).

Main Results:

  • The new DOI system enables simultaneous optical data collection from multiple cortical regions (prefrontal, sensorimotor, visual) across both hemispheres.
  • System characterization confirmed its efficacy in phantom and human studies.
  • Exploration of physiological signal patterns revealed their interference with hemodynamic response measurements.
  • Demonstrated potential for whole-head mapping of brain activation responses.

Conclusions:

  • The enhanced DOI system significantly expands the coverage of optical neuroimaging.
  • Simultaneous whole-head measurements facilitate a deeper understanding of physiological signal interference.
  • This advancement is expected to lead to improved signal processing algorithms for distinguishing brain activity from noise.