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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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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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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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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:
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Imaging Studies III: Computed Tomography01:27

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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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Human In Vitro Suppression as Screening Tool for the Recognition of an Early State of Immune Imbalance
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Published on: July 22, 2011

Slowing Down Water: Enhanced and Cation-responsive MRI Contrast.

Connor M Ellis1, James P Smith1, Matthew F Allen1

  • 1Department of Chemistry, University of Oxford, Oxford, UK.

Angewandte Chemie (International Ed. in English)
|May 20, 2026
PubMed
Summary
This summary is machine-generated.

Paramagnetic centers confined in mesoporous nanoparticles enhance MRI contrast. Modulating water viscosity via kosmotropic effects and crown ethers enables potassium-responsive imaging.

Keywords:
Contrast agentMRImesoporous silica nanoparticlesouter‐spherepotassium‐responsive

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Area of Science:

  • Nanoparticle science
  • Magnetic Resonance Imaging (MRI)
  • Supramolecular chemistry

Background:

  • Paramagnetic centers confined within mesoporous nanoparticles offer unique properties.
  • Outer sphere effects and water diffusion are influenced by nanoparticle channel confinement.
  • Mesoporous nanoparticle side wall modifications allow for tuning of local water environments.

Purpose of the Study:

  • To investigate the impact of kosmotropic effects on water viscosity around internalised paramagnetic complexes.
  • To enhance MRI contrast (T1 and q=0) using tailored mesoporous nanoparticles.
  • To develop physiologically relevant, potassium-responsive MRI.

Main Methods:

  • Utilizing mesoporous nanoparticles with internalised paramagnetic centers.
  • Modifying nanoparticle side walls to induce kosmotropic (water-ordering) effects.
  • Employing crown ethers for cation binding and subsequent water organization modulation.

Main Results:

  • Demonstrated significant increase in water viscosity near paramagnetic complexes.
  • Achieved unprecedented image contrast for q=0 systems and enhanced T1 contrast for q=1 complexes at clinical field strengths.
  • Enabled potassium-responsive MRI by modulating water organization through crown ether-cation interactions.

Conclusions:

  • Mesoporous nanoparticle confinement and side wall engineering are effective strategies for enhancing MRI contrast.
  • Kosmotropic effects and controlled water organization are key to improving MRI performance.
  • The developed system shows promise for advanced diagnostic imaging, including physiologically relevant potassium sensing.