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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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.
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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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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Technical Note: Practical implementation strategies of cycloidal computed tomography.

Oriol Roche I Morgó1, Fabio Vittoria1,2, Marco Endrizzi1

  • 1Department of Medical Physics and Biomedical Engineering, University College London, London, WC1E 6BT, UK.

Medical Physics
|June 25, 2021
PubMed
Summary

Cycloidal computed tomography (CT) offers flexible, high-resolution imaging with reduced scan times. Various implementation strategies, including step-and-shoot and continuous scanning, provide efficient and high-quality results for diverse imaging needs.

Keywords:
cycloidal computed tomographymicro computed tomographyphase contrastspatial resolutionstructured illumination

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Area of Science:

  • Medical Imaging
  • X-ray Technology
  • Computational Imaging

Background:

  • Cycloidal computed tomography (CT) is an advanced imaging technique.
  • It utilizes a structured x-ray beam, under-sampling, and data recovery.
  • This method aims for efficient, flexible, high-resolution imaging with potentially reduced dose.

Purpose of the Study:

  • To present and discuss various implementation strategies for cycloidal CT.
  • To enhance the usability and adoption of cycloidal CT in the imaging community.

Main Methods:

  • Four scanning strategies were evaluated: step-and-shoot, continuous unidirectional, continuous back-and-forth, and continuous pixel-wise.
  • Step-and-shoot involves stationary sample acquisition.
  • Continuous methods involve sample movement through the scanner with different trajectories.

Main Results:

  • All strategies are compatible with standard table-top X-ray setups.
  • Step-and-shoot yielded the highest resolution (~30 µm) but was slowest (1.4 h).
  • Continuous methods offered faster scans (35 min) with resolutions between 30-50 µm, depending on the specific trajectory and technical execution.

Conclusions:

  • Cycloidal CT is implementable through multiple strategies, achieving high-quality results.
  • The flexibility in implementation positions cycloidal CT as a strong alternative to existing imaging methods.
  • This technique offers a powerful imaging solution that is less time-consuming and more flexible.