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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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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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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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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 Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

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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...
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X-ray Imaging01:24

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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...
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Related Experiment Video

Updated: Oct 9, 2025

Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
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Spectral Photon-Counting CT Technology in Chest Imaging.

Salim Aymeric Si-Mohamed1,2, Jade Miailhes2, Pierre-Antoine Rodesch1

  • 1INSA-Lyon, University of Lyon, University Claude-Bernard Lyon 1, UJM-Saint-Étienne, CNRS, Inserm, CREATIS UMR 5220, U1206, 69621 Lyon, France.

Journal of Clinical Medicine
|December 24, 2021
PubMed
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Photon-counting detectors (PCD) offer advanced X-ray imaging with smaller pixels and higher dose efficiency. These photon-counting CT (PCD-CT) systems enable spectral imaging, showing potential as a conventional CT alternative for chest imaging.

Keywords:
computed tomographydiagnostic imaginglungphoton-counting detectorsthorax

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Area of Science:

  • Medical physics
  • Radiology
  • Diagnostic imaging technology

Background:

  • The field of X-ray imaging is experiencing rapid technological advancements.
  • Photon-counting detectors (PCD) represent a significant innovation in diagnostic imaging equipment.
  • Clinical prototype systems, known as PCD computed tomography (PCD-CT), are emerging.

Purpose of the Study:

  • To evaluate the potential of photon-counting CT (PCD-CT) as an alternative to conventional CT for chest imaging.
  • To highlight the advantages of PCDs over conventional energy integrating detectors (EID).

Main Methods:

  • Introduction of new X-ray detectors: photon-counting detectors (PCD).
  • Comparison of PCD capabilities with conventional energy integrating detectors (EID).
  • Exploration of spectral imaging techniques enabled by PCDs.

Main Results:

  • PCDs enable smaller pixel sizes (up to 200 microns) compared to EID.
  • PCDs offer higher dose efficiency due to electronic noise suppression.
  • PCDs facilitate spectral basis imaging, including mono-energetic and material decomposition images.

Conclusions:

  • PCD-CT systems offer superior spatial resolution and dose efficiency.
  • The energy-resolving capability of PCDs enables advanced spectral imaging applications.
  • PCD-CT shows promise as a viable alternative to conventional CT for chest imaging evaluations.