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Related Concept Videos

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.
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...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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...
Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

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...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
X-ray Imaging01:24

X-ray Imaging

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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Related Experiment Video

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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

Published on: September 11, 2011

Post-processing image filtration enabling dose reduction in standard abdominal CT.

Peter Leander1, Marcus Söderberg, Tobias Fält

  • 1Department of Radiology, Malmö University Hospital, Lund University, Malmö, Sweden. peter.leander@med.lu.se

Radiation Protection Dosimetry
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PubMed
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Lowering radiation dose in computed tomography (CT) using SharpView AB's adaptive image filtration shows promise. While filtration improved image quality at lower doses, higher doses without filtration were still preferred in some criteria.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Image Processing

Background:

  • Increasing use of computed tomography (CT) leads to higher population radiation doses.
  • SharpView AB developed adaptive non-linear post-processing image filtration to potentially reduce radiation exposure.
  • The study investigates the efficacy of this filtration in maintaining image quality at lower doses.

Purpose of the Study:

  • To assess if lower radiation doses with adaptive image filtration achieve comparable image quality to higher doses without filtration.
  • To evaluate the impact of SharpView AB's filtration technology on CT image noise and quality.
  • To determine the potential of reduced mAs settings with filtration for general abdominal CT.

Main Methods:

  • Siemens Somatom Sensation 16 CT scanner used for all imaging.
  • Two patient groups (40 each): 120 kV and 200 mAs; 130 mAs without and with image filtering.
  • Quantitative noise evaluation and visual grading characteristics (VGC) analysis for image quality assessment.

Main Results:

  • Image filtration significantly reduced noise in processed images.
  • VGC analysis demonstrated improved image quality with filtration.
  • However, images acquired at the higher dose (200 mAs, no filter) were rated superior in five out of eight VGC criteria.

Conclusions:

  • Adaptive non-linear image filtration enhances CT image quality and reduces noise.
  • Further research is needed to confirm if 130 mAs with filtration is adequate for routine abdominal CT.
  • The technology holds potential for dose reduction in computed tomography examinations.