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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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...
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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Structured interference optical coherence tomography.

Ji Yi1, Qing Wei, Hao F Zhang

  • 1Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, USA. ji‑yi@northwestern.edu

Optics Letters
|August 4, 2012
PubMed
Summary
This summary is machine-generated.

We developed structured interference optical coherence tomography (SIOCT) to achieve super-resolution imaging. This novel technique doubles lateral resolution, surpassing the diffraction limit for enhanced tissue visualization.

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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

Published on: August 4, 2018

Area of Science:

  • Biomedical optics
  • Advanced imaging techniques
  • Microscopy

Background:

  • Optical coherence tomography (OCT) is a vital non-invasive imaging modality.
  • Conventional Fourier-domain OCT (FD-OCT) is limited by the diffraction limit for lateral resolution.
  • Enhancing lateral resolution is crucial for detailed microstructural analysis in biological tissues.

Purpose of the Study:

  • To introduce and validate a novel Structured Interference Optical Coherence Tomography (SIOCT) technique.
  • To demonstrate the capability of SIOCT to surpass the diffraction limit for lateral resolution.
  • To evaluate the performance of SIOCT in imaging biological samples.

Main Methods:

  • Development of SIOCT utilizing a sinusoidal pattern on the interferometric beam.
  • Temporal modulation of reference intensity to shift high spatial frequencies.
  • Fourier domain analysis to recover frequencies beyond the conventional detectable range.
  • Characterization of lateral resolution using phantoms and ex vivo adipose tissues.

Main Results:

  • SIOCT achieved a lateral resolution of approximately 5.5 μm.
  • This resolution surpasses the diffraction limit of ~9.6 μm observed in conventional FD-OCT.
  • The technique effectively enhanced lateral resolution by a factor of 2.
  • Successful demonstration of SIOCT on phantoms and ex vivo adipose tissues.

Conclusions:

  • SIOCT offers a significant advancement in OCT imaging by overcoming the diffraction limit.
  • The enhanced lateral resolution provided by SIOCT enables more detailed microstructural imaging.
  • SIOCT holds promise for various biomedical applications requiring high-resolution tissue analysis.