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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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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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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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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.
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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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Differences in radiopacity among CT contrast agents and concentrations: A quantitative study.

Amit Mehta1, Jorge A Roa2, Kelly Cannavale2

  • 1Department of Neurology, MedStar Georgetown University Hospital, Washington, District of Columbia, USA.

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|August 25, 2023
PubMed
Summary

Isovue 370 offers the best radiopacity and accuracy for neurovascular imaging. Other contrast agents like Visipaque 320 and Omnipaque 300 show comparable results at certain concentrations, aiding in patient care.

Keywords:
Hounsfield unitangiographycomputerized tomographycontrastneurointerventionradiopacity

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Area of Science:

  • Radiology and Imaging
  • Medical Devices and Contrast Agents
  • Neurointerventional Surgery

Background:

  • Subjective assessments of neurovascular visualization exist.
  • Contrast agent shortages necessitate objective comparisons.
  • Radiopacity is crucial for visualizing neurovascular structures.

Purpose of the Study:

  • To objectively compare the radiopacity of four clinical angiographic contrast agents.
  • To evaluate contrast agent performance under varying concentrations.
  • To assess accuracy in aneurysm dimension measurements.

Main Methods:

  • Four contrast agents (Isovue 370, Visipaque 320, Omnipaque 300, Isovue 300) tested at 25-100% concentrations.
  • CT scans analyzed for radiopacity using Hounsfield units (HU).
  • Aneurysm models scanned to compare dimensions; statistical analysis performed.

Main Results:

  • Isovue 370 yielded the highest mean HU; Isovue 300 yielded the lowest.
  • Visipaque 320 (25%) had the lowest mean HU (-.76).
  • Isovue 300 measurements underestimated aneurysm dimensions compared to others.

Conclusions:

  • Isovue 370 provides superior radiopacity and accurate aneurysm measurements.
  • Isovue 300 may lead to underestimation of aneurysm size.
  • Visipaque 320 and Omnipaque 300 (100%) offer similar HU and are suitable for specific patient groups.