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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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...
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...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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,...

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Holoscopy--holographic optical coherence tomography.

Dierck Hillmann1, Christian Lührs, Tim Bonin

  • 1Institute of Biomedical Optics, University of Lübeck, Peter-Monnik-Weg 4, 23562 Lübeck, Germany.

Optics Letters
|July 5, 2011
PubMed
Summary
This summary is machine-generated.

Holoscopy overcomes scanning optical coherence tomography limitations by detecting photons from all depths simultaneously. This advanced technique offers uniform sensitivity and resolution for clearer imaging, even in deep tissues.

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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)
12:22

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

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Area of Science:

  • Biomedical Optics
  • Holographic Imaging
  • Optical Coherence Tomography

Background:

  • Scanning optical coherence tomography (OCT) faces limitations in sensitivity and resolution due to its restricted focal depth.
  • Confocal detection schemes in OCT hinder the ability to image samples uniformly across varying depths.
  • High numerical apertures (NAs) further exacerbate focal depth issues in conventional OCT.

Purpose of the Study:

  • To introduce Holoscopy, a novel imaging technique combining holography and Fourier-domain full-field OCT.
  • To enable simultaneous detection of photons from all depths within a sample volume.
  • To achieve uniform sensitivity and lateral resolution, independent of depth and high NAs.

Main Methods:

  • Utilizing scalar diffraction theory, commonly applied in digital holographic imaging.
  • Reconstructing the object field by analyzing holographic interference patterns.
  • Implementing a Fourier-domain full-field OCT system integrated with holographic principles.

Main Results:

  • Demonstrated depth-invariant imaging quality across the entire sample volume.
  • Achieved uniform sensitivity and lateral resolution, overcoming focal depth restrictions.
  • Successfully performed in vivo imaging of human skin with image quality comparable to conventional OCT.

Conclusions:

  • Holoscopy offers a significant advancement over traditional scanning OCT by providing depth-independent imaging.
  • The technique successfully addresses the sensitivity and resolution limitations inherent in confocal detection.
  • Holoscopy presents a promising alternative for high-resolution, uniform imaging in biological tissues.