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Related Concept Videos

Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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 Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
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,...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...

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Related Experiment Video

Updated: Jun 27, 2026

Three-dimensional Confocal Analysis of Microglia/macrophage Markers of Polarization in Experimental Brain Injury
13:28

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Published on: September 4, 2013

Column-by-column compositional mapping by Z-contrast imaging.

S I Molina1, D L Sales, P L Galindo

  • 1Departamento de Ciencia de los Materiales e IM y QI, Facultad de Ciencias, Universidad de Cádiz, Puerto Real, Cádiz, Spain. sergio.molina@uca.es

Ultramicroscopy
|December 9, 2008
PubMed
Summary
This summary is machine-generated.

A new method uses aberration-corrected Z-contrast scanning transmission electron microscopy to precisely determine material composition at the atomic level. This technique was successfully applied to analyze indium arsenide phosphide alloys and quantum wire wetting layers.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Accurate material composition analysis is crucial for semiconductor device performance.
  • Traditional methods may lack atomic resolution or require complex calibration.
  • Understanding interfacial layers in quantum structures is key for advanced electronics.

Purpose of the Study:

  • To develop a phenomenological method for atomic-resolution material composition determination.
  • To apply this method to InAs(x)P(1-x) alloys and quantum wire wetting layers.
  • To validate the method using calibrated epitaxial thin film standards.

Main Methods:

  • Utilizing aberration-corrected Z-contrast scanning transmission electron microscopy (STEM).
  • Analyzing integrated intensities of STEM images for quantitative composition analysis.
  • Employing calibrated InAs(x)P(1-x) epitaxial thin films as standards.

Main Results:

  • The developed phenomenological method achieves atomic column resolution for composition analysis.
  • Successful application to InAs(x)P(1-x) alloys with known compositions.
  • Precise determination of the composition of the 2D wetting layer in InAs quantum wires on InP substrates.

Conclusions:

  • The new method provides a robust approach for quantitative composition analysis in nanomaterials.
  • This technique enhances the understanding of interfacial phenomena in self-assembled quantum structures.
  • The findings are significant for the design and fabrication of advanced semiconductor devices.