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Computed Tomography01:10

Computed Tomography

9.1K
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...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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...
490
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

1.0K
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...
1.0K

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Related Experiment Video

Updated: Feb 27, 2026

In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography CT and Light Microscopy LM Correlated with Scanning Electron Microscopy SEM
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Developments on a SEM-based X-ray tomography system: Stabilization scheme and performance evaluation.

L A Gomes Perini1, P Bleuet1, J Filevich2

  • 1Université Grenoble Alpes, F-38000 Grenoble, France.

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|July 3, 2017
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Summary

This study introduces an improved scanning electron microscope (SEM)-based X-ray tomography system with in-line drift correction for enhanced stability and resolution. The new system utilizes a scientific CMOS camera for high-quality X-ray imaging across various scientific fields.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Scanning Electron Microscope (SEM)-based X-ray tomography systems generate X-rays via electron beam-anode interaction.
  • Electron beam drift can degrade X-ray flux and image resolution, limiting system performance.
  • High-performance X-ray detection is crucial for detailed imaging.

Purpose of the Study:

  • To describe recent improvements in an SEM-based X-ray tomography system.
  • To address electron beam drift issues impacting X-ray flux and spatial resolution.
  • To evaluate the system's performance for microelectronics, technical textile, and material science applications.

Main Methods:

  • Integration of a closed-loop control system with Fast Fourier Transform (FFT)-based image correlation for in-line drift correction.
  • Utilizing a state-of-the-art scientific CMOS camera with high quantum efficiency (~60%) and low read-out noise (~1.2 electrons) for X-ray detection (indirect detection).
  • Performance evaluation based on resolution, detectability, and scanning times.

Main Results:

  • Successful implementation of an in-line drift correction system mitigating e-beam instability.
  • High-quality X-ray detection achieved with a scientific CMOS camera.
  • Demonstrated system efficacy across diverse fields including microelectronics, technical textiles, and material science.

Conclusions:

  • The improved SEM-based X-ray tomography system offers enhanced stability and resolution.
  • The integrated drift correction and advanced detector improve imaging capabilities.
  • The system is suitable for demanding applications in microelectronics, technical textiles, and material science.