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Related Concept Videos

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...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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,...
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...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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,...
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...
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...

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Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques
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Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques

Published on: June 11, 2019

Contrast agents: magnetic resonance.

Carmen Burtea1, Sophie Laurent, Luce Vander Elst

  • 1Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons-Hainaut, 24, Avenue du Champ de Mars, 7000, Mons, Belgium. carmen.burtea@umh.ac.be

Handbook of Experimental Pharmacology
|July 16, 2008
PubMed
Summary
This summary is machine-generated.

Magnetic resonance imaging (MRI) contrast agents enhance tissue differences for pathology diagnosis. New molecular imaging agents offer increased specificity for detecting disease hallmarks.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Radiology

Background:

  • Magnetic resonance imaging (MRI) contrast agents (CAs) are crucial for enhancing diagnostic accuracy by modifying tissue parameters.
  • Unlike other modalities, MR CAs are indirect, influencing water proton relaxation rates (R1 and R2) rather than being directly visible.
  • Current CAs, often gadolinium-based or iron oxide nanoparticles, offer broad applications but lack pathological specificity.

Purpose of the Study:

  • To review the mechanisms and applications of current MRI contrast agents.
  • To highlight the limitations of existing non-specific CAs in diagnosing pathologies.
  • To introduce the emerging field of molecular imaging and its potential for developing specific MRI contrast agents.

Main Methods:

  • Review of existing literature on MRI contrast agent mechanisms and classifications.
  • Analysis of relaxivity (r1 and r2) principles for positive (T1 shortening) and negative (T2/T2* shortening) contrast enhancement.
  • Discussion of nanoparticle uptake and targeting strategies for advanced imaging.

Main Results:

  • Paramagnetic CAs (e.g., gadolinium) primarily cause T1 shortening, leading to positive contrast (brightening on T1-weighted images).
  • Superparamagnetic iron oxide nanoparticles induce T2/T2* shortening, resulting in negative contrast (darkening).
  • Contemporary CAs are generally non-specific, providing anatomical and physiological information.

Conclusions:

  • A new generation of MRI contrast agents is being developed for molecular imaging.
  • These advanced agents aim to detect specific cellular and molecular markers of disease with high precision.
  • The future of MRI contrast agents lies in targeted, specific detection for improved pathological diagnosis.