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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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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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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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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.
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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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Updated: Dec 3, 2025

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Photon-counting x-ray detectors for CT.

Mats Danielsson1,2, Mats Persson1,3, Martin Sjölin2

  • 1Department of Physics, KTH Royal Institute of Technology, AlbaNova University Center, SE-106 91 Stockholm, Sweden.

Physics in Medicine and Biology
|October 28, 2020
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Summary
This summary is machine-generated.

Photon-counting detectors represent a major advance in clinical X-ray computed tomography (CT). This review details how detector design choices impact image quality, dose efficiency, and resolution for photon-counting CT systems.

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Area of Science:

  • Medical Imaging Physics
  • Radiological Technology
  • Detector Science

Background:

  • Photon-counting detectors are poised to revolutionize clinical X-ray computed tomography (CT).
  • Significant research has focused on hardware and theoretical aspects of photon-counting CT over the past decade.
  • Understanding detector design's impact on image quality is crucial for clinical adoption.

Purpose of the Study:

  • To review recent advancements in photon-counting CT.
  • To connect detector design considerations with resulting image quality.
  • To provide an overview of data processing, clinical applications, and future developments.

Main Methods:

  • Review of recent research in photon-counting detector hardware and theory.
  • Analysis of detector design choices: converter material, pixel size, readout electronics.
  • Discussion of impact on dose efficiency, spatial resolution, and energy resolution.

Main Results:

  • Detector design choices directly influence key performance metrics like dose efficiency, spatial resolution, and energy resolution.
  • Specific design parameters (e.g., converter material, pixel size) have predictable effects on image quality.
  • Advancements in data processing and reconstruction methods are enabling improved imaging performance.

Conclusions:

  • Photon-counting CT detector design is critical for enhancing clinical imaging.
  • Future developments promise further improvements in clinical applications and performance.
  • This technology holds significant potential for the next generation of CT scanners.