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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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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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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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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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Imaging Studies IV: Magnetic Resonance Imaging01:27

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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MRI contrast agents: Classification and application (Review).

Yu-Dong Xiao1, Ramchandra Paudel1, Jun Liu1

  • 1Department of Radiology, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China.

International Journal of Molecular Medicine
|September 27, 2016
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Summary
This summary is machine-generated.

Magnetic resonance imaging (MRI) contrast agents, often metal-based, are categorized by composition and administration. They enhance image clarity by altering relaxation times, aiding in disease detection.

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Area of Science:

  • Radiology and Medical Imaging
  • Materials Science in Medicine
  • Biomedical Engineering

Background:

  • Magnetic resonance imaging (MRI) contrast agents are crucial for enhancing diagnostic accuracy.
  • These agents are primarily composed of paramagnetic ion complexes or superparamagnetic magnetite particles, often containing metals like gadolinium (Gd3+) or manganese (Mn2+).
  • Understanding their properties is key to optimizing imaging techniques.

Purpose of the Study:

  • To categorize MRI contrast agents based on key features.
  • To explain the mechanism of action for both positive and negative contrast agents.
  • To review the administration routes, biodistribution, and specific applications of these agents.

Main Methods:

  • Classification based on chemical composition (metal presence/absence).
  • Categorization by route of administration (oral, intravenous).
  • Grouping by magnetic properties, effect on relaxation times (T1, T2), biodistribution, and clinical applications.

Main Results:

  • Paramagnetic agents (e.g., Gd3+, Mn2+) shorten T1 relaxation, increasing signal intensity (positive contrast).
  • Superparamagnetic and ferromagnetic agents shorten T2 relaxation, decreasing signal intensity (negative contrast).
  • Chelating agents reduce toxicity and enhance excretion.
  • Agents are categorized into extracellular fluid, blood pool, and target-specific types.

Conclusions:

  • MRI contrast agents are diverse, with categorization aiding in selection for specific diagnostic needs.
  • Their mechanism involves altering tissue relaxation times, leading to enhanced image contrast.
  • Advancements focus on targeted delivery and improved safety profiles for various medical conditions, including liver pathologies and tumors.