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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.
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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
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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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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...

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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Published on: September 11, 2011

Distributed source x-ray tube technology for tomosynthesis imaging.

F Sprenger1, X Calderon-Colon, Y Cheng

  • 1XinRay Systems LLC, Research Triangle Park, NC, USA.

Proceedings of Spie--The International Society for Optical Engineering
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces stationary distributed x-ray sources using carbon nanotube (CNT) field emission cathodes for tomosynthesis imaging. This innovation enables faster imaging with improved resolution, eliminating mechanical motion in systems like digital breast tomosynthesis (DBT).

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Area of Science:

  • Medical Imaging Physics
  • Materials Science
  • X-ray Technology

Background:

  • Tomosynthesis imaging necessitates multiple projection angles.
  • Conventional systems rely on mechanical movement of the x-ray source for data acquisition.
  • Mechanical motion can limit imaging speed and system complexity.

Purpose of the Study:

  • To present a novel stationary distributed x-ray source system for tomosynthesis.
  • To leverage carbon nanotube (CNT) field emission cathodes for efficient x-ray generation.
  • To explore applications in stationary digital breast tomosynthesis (sDBT) and image-guided radiation therapy (IGRT).

Main Methods:

  • Development of stationary distributed x-ray sources utilizing CNT field emission cathodes.
  • Characterization of CNT emitters for stable, high-current density, cold emission with temporal control.
  • Design and discussion of linear and square tube configurations for specific tomosynthesis applications.

Main Results:

  • Demonstrated feasibility of stationary distributed x-ray sources without mechanical motion.
  • CNT emitters provide stable emission, high current density, and precise temporal control.
  • Successful application in stationary digital breast tomosynthesis (sDBT) and potential for image-guided radiation therapy (IGRT).
  • High energy sources up to 160kVp were achieved.

Conclusions:

  • Stationary distributed x-ray sources based on CNTs offer a promising alternative to conventional moving systems.
  • This technology enables faster acquisition, higher resolution, and simpler system designs for tomosynthesis.
  • Potential for significant advancements in medical imaging and radiation therapy guidance.