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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.
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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

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,...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...

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Related Experiment Video

Updated: Jun 16, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Multiphoton coherence domain molecular imaging with pump-probe optical coherence microscopy.

Qiujie Wan1, Brian E Applegate

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, USA.

Optics Letters
|February 18, 2010
PubMed
Summary

We developed pump-probe optical coherence microscopy (PPOCM) for high-resolution molecular imaging. This technique effectively distinguishes between melanotic and amelanotic melanoma regions in skin samples.

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Area of Science:

  • Biomedical Optics
  • Molecular Imaging
  • Dermatology

Background:

  • Melanoma diagnosis and margin mapping are critical in surgical oncology.
  • Existing imaging techniques may lack the resolution or specificity for detailed melanin analysis.
  • High-resolution molecular imaging can provide enhanced contrast for biological tissues.

Purpose of the Study:

  • To develop and demonstrate a novel high-resolution molecular imaging technique.
  • To assess the capability of the technique in differentiating melanotic and amelanotic regions in melanoma.
  • To explore potential applications in melanoma diagnosis and surgical guidance.

Main Methods:

  • Fusion of pump-probe spectroscopy and optical coherence microscopy to create pump-probe optical coherence microscopy (PPOCM).
  • Development of a prototype PPOCM system.
  • Testing the system on a fixed human skin sample with nodular melanoma.

Main Results:

  • The PPOCM system achieved high-resolution molecular imaging.
  • A strong contrast was clearly observed between melanotic and amelanotic regions.
  • The technique demonstrated feasibility for imaging melanin in melanoma.

Conclusions:

  • PPOCM is a promising technique for high-resolution molecular imaging.
  • It offers potential for early melanoma diagnosis and precise tumor margin mapping.
  • The technique is adaptable for imaging various biological chromophores.