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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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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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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...
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Related Experiment Video

Updated: Nov 15, 2025

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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Accurately motion-corrected Lissajous OCT with multi-type image registration.

Shuichi Makita1,2, Masahiro Miura2,3, Shinnosuke Azuma4

  • 1Computation Optics Group, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.

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Summary

A new multi-image cross-correlation method improves motion correction in optical coherence tomography (OCT) imaging. This technique enhances image quality for retinal OCT angiography (OCT-A) by better registering eye movements.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Passive motion correction in optical coherence tomography (OCT) relies on image registration to compensate for eye movements.
  • Existing methods may have limitations in accurately correcting complex motion patterns during retinal imaging.

Purpose of the Study:

  • To introduce and evaluate a novel multi-image cross-correlation technique for enhanced motion correction in OCT.
  • To improve the accuracy of lateral motion correction using various OCT and OCT angiography (OCT-A) projection types.

Main Methods:

  • A multi-image cross-correlation approach utilizing spatial features from different OCT image types was developed.
  • Lateral motion correction was applied to Lissajous-scanned OCT data using en face OCT and OCT-A projections.
  • The method's performance was assessed in 76 patients, comparing OCT-A whole depth projection with OCT amplitude, logarithmic intensity, and maximum intensity projections.

Main Results:

  • The proposed multi-image cross-correlation method demonstrated improved image quality in motion-corrected superficial OCT-A images.
  • Enhanced image registration accuracy was observed compared to standard OCT-A whole depth projection methods.
  • The technique effectively addressed lateral eye movements during OCT acquisition.

Conclusions:

  • The novel multi-image cross-correlation method offers superior motion correction for OCT and OCT-A imaging.
  • This advancement leads to better image quality and registration, crucial for accurate retinal analysis.
  • The technique shows significant potential for improving diagnostic capabilities in ophthalmology.