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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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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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Related Experiment Video

Updated: Jun 22, 2026

Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
05:32

Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph

Published on: February 21, 2025

Phase retrieval from one single phase contrast x-ray image.

Xizeng Wu1, Aimin Yan

  • 1Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35233, USA. xwu@uabmc.edu

Optics Express
|June 25, 2009
PubMed
Summary

This study introduces a new phase retrieval formula for high-resolution x-ray phase-sensitive imaging. The advanced formula enables artifact-free 3D imaging with enhanced reconstruction of high-frequency details.

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

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Last Updated: Jun 22, 2026

Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
05:32

Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph

Published on: February 21, 2025

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Area of Science:

  • Medical Imaging
  • Computational Physics
  • Optics

Background:

  • X-ray phase-sensitive imaging requires phase retrieval for artifact-free 3D reconstructions.
  • Existing phase retrieval methods using phase-attenuation duality are limited to small Fresnel propagator phases, suitable for common clinical tasks.
  • High-resolution imaging necessitates phase retrieval from larger Fresnel propagator phases.

Purpose of the Study:

  • To develop a novel phase retrieval formula applicable to large Fresnel propagator phases for high-resolution imaging.
  • To improve the reconstruction of high-frequency components in phase-sensitive imaging.
  • To lay the groundwork for high-resolution 3D phase-sensitive imaging of soft tissues.

Main Methods:

  • Developed a new duality-based phase retrieval formula for large Fresnel propagator phases.
  • Employed computer simulations to validate the new formula against previous methods.
  • Implemented a modified Tikhonov regularization technique for scenarios with very high resolution and large object-detector distances.

Main Results:

  • The new phase retrieval formula demonstrated superiority in reconstructing high-frequency components compared to the previous formula.
  • Simulations confirmed the effectiveness of the new formula for high-resolution imaging tasks.
  • The modified regularization technique addresses challenges posed by Fresnel propagator phases near or exceeding pi.

Conclusions:

  • The new phase retrieval formula significantly enhances the capability for high-resolution phase-sensitive x-ray imaging.
  • This advancement is crucial for detailed imaging of soft tissue objects.
  • The developed method provides a foundation for future high-resolution 3D imaging applications.