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Related Concept Videos

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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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Millimeter-resolution acousto-optic quantitative imaging in a tissue model system.

Aliaksandr Bratchenia1, Robert Molenaar, Ton G van Leeuwen

  • 1University of Twente, Institute of Biomedical Technology, Faculty of Science and Technology, P.O. Box 217, 7500 AE Enschede, The Netherlands. a.bratchenia@tnw.utwente.nl

Journal of Biomedical Optics
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This study demonstrates ultrasound modulated light can quantitatively map dye concentrations in a tissue-mimicking sample. The technique achieves high accuracy for determining absorber ratios and total concentration, enabling 3-D mapping.

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Area of Science:

  • Biomedical Optics
  • Acousto-Optics
  • Medical Imaging

Background:

  • Accurate quantification of absorbers in biological tissues is crucial for diagnostics.
  • Noninvasive methods for determining oxygen saturation and hemoglobin concentration are highly sought after.
  • Ultrasound modulation of light offers potential for enhanced optical imaging in scattering media.

Purpose of the Study:

  • To investigate ultrasound modulated coherent light for quantitative analysis of dye concentrations in a blood vessel-mimicking sample.
  • To assess the accuracy of determining dye concentration ratios and total absorber concentration.
  • To demonstrate the feasibility of 3-D mapping of absorbing structures.

Main Methods:

  • Utilized two laser wavelengths and intense microsecond ultrasound bursts to interrogate a dye-filled tube within an Intralipid-based gel.
  • Employed calibration curves to extract quantitative optical properties.
  • Evaluated the spatial resolution of the 3-D mapping capability.

Main Results:

  • Achieved quantitative determination of dye concentration ratios with accuracy better than 15%.
  • Successfully determined the total concentration of absorbers.
  • Demonstrated the feasibility of 3-D mapping of the absorbing structure with a spatial resolution better than 3 mm.

Conclusions:

  • Ultrasound modulated coherent light is a viable technique for quantitative optical measurements in tissue-mimicking phantoms.
  • The method shows promise for noninvasive 3-D mapping of physiological parameters like oxygen saturation and total hemoglobin concentration.
  • Further development could lead to advanced diagnostic tools for tissue analysis.