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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.
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Related Experiment Video

Updated: Jul 1, 2025

3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
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A carbon nanotube x-ray source array designed for a new multisource cone beam computed tomography scanner.

Boyuan Li1, Christina R Inscoe1, Shuang Xu2

  • 1Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.

Physics in Medicine and Biology
|March 12, 2024
PubMed
Summary

A new carbon nanotube (CNT) x-ray source array enables faster multisource cone beam computed tomography (ms-CBCT) imaging. This technology significantly reduces scatter and artifacts in maxillofacial imaging, improving diagnostic accuracy.

Keywords:
CBCTcarbon nanotubecone beam artifactsfield emission x-raymultisourcescatter reductionx-ray imaging

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Area of Science:

  • Medical Imaging
  • Materials Science
  • Physics

Background:

  • Conventional cone beam computed tomography (CBCT) is limited by scatter and cone beam artifacts.
  • These artifacts can degrade image quality and affect diagnostic accuracy in maxillofacial imaging.

Purpose of the Study:

  • To develop and characterize a rapidly scanning carbon nanotube (CNT) field emission x-ray source array.
  • To enable a multisource CBCT (ms-CBCT) imaging scheme that overcomes limitations of conventional CBCT.

Main Methods:

  • Designed and fabricated an eight-focal-spot CNT x-ray source array for ms-CBCT.
  • Utilized an external collimator to narrow the x-ray beam cone angle.
  • Scanned the array axially while continuously rotating around the object with a flat panel detector.

Main Results:

  • Achieved consistent focal spot size (1.10 ± 0.04 mm × 0.84 ± 0.03 mm) and beam cone angle (2.4°±0.08).
  • Demonstrated rapid x-ray beam switching (rising/damping times of 0.21 ms / 0.19 ms).
  • Obtained high dose rates (8245 μGy s⁻¹ without Cu filter) with negligible change over operating cycles.

Conclusions:

  • The developed CNT x-ray source array enables a novel ms-CBCT system.
  • This ms-CBCT approach effectively overcomes inherent limitations of conventional CBCT.
  • The system achieved clinical CBCT imaging dose levels within a rapid scan time of 14.4 seconds.