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Related Concept Videos

Computed Tomography01:10

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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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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...
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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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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.
Electron Tomography
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Positron Emission Tomography01:29

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers
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Spectral Computed Tomography: Fundamental Principles and Recent Developments.

Aaron So1,2, Savvas Nicolaou3,4

  • 1Imaging Program, Lawson Health Research Institute, London, Canada.

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|September 15, 2020
PubMed
Summary
This summary is machine-generated.

Spectral computed tomography (CT) offers improved material differentiation over conventional CT by utilizing the energy dependence of X-ray attenuation. Dual-energy CT, a form of spectral CT, enhances tissue classification and has seen successful clinical implementation.

Keywords:
Computed tomographyDual energySpectralX-rays

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Area of Science:

  • Medical Imaging
  • Radiology
  • Physics

Background:

  • Conventional computed tomography (CT) voxel intensity is limited in differentiating materials due to non-unique X-ray attenuation.
  • This ambiguity challenges accurate tissue type classification in medical diagnostics.
  • Spectral CT leverages the energy-dependent nature of X-ray attenuation for enhanced material differentiation.

Purpose of the Study:

  • To review the theoretical underpinnings of spectral CT.
  • To discuss the practical implementation of spectral and dual-energy CT.
  • To highlight the advantages of spectral CT in material differentiation.

Main Methods:

  • Review of theoretical principles of X-ray attenuation across different energy levels.
  • Examination of dual-energy CT acquisition techniques.
  • Analysis of spectral CT data processing and interpretation.

Main Results:

  • Spectral CT provides superior material differentiation compared to single-energy CT.
  • Dual-energy CT enables enhanced characterization of substances based on their unique attenuation profiles.
  • Successful clinical integration of dual-energy CT demonstrates its practical utility.

Conclusions:

  • Spectral CT, particularly dual-energy CT, significantly improves material differentiation in medical imaging.
  • The energy-dependent X-ray attenuation is key to spectral CT's enhanced diagnostic capabilities.
  • Further exploration of spectral/dual-energy CT's theoretical basis and clinical applications is warranted.