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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 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 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,...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from 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...
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...

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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Open magnetic resonance imaging (MRI) scanners.

D Hailey1

  • 1Canadian Agency for Drugs and Technologies in Health, Ottawa, Canada.

Issues in Emerging Health Technologies
|November 8, 2006
PubMed
Summary

Open MRI scanners offer solutions for claustrophobic patients and larger individuals, overcoming limitations of traditional tube-shaped MRI machines. Newer open MRI systems provide improved image quality and magnetic field strength, enhancing patient comfort and accessibility.

Area of Science:

  • Medical Imaging
  • Radiology

Background:

  • Traditional MRI scanners utilize a long cylindrical tube, posing challenges for large patients and those experiencing claustrophobia.
  • Open MRI systems, featuring a design with the patient between two plates, address these limitations.
  • While widely used, open MRI systems historically offered lower magnetic field strength and image quality compared to closed systems.

Purpose of the Study:

  • To evaluate the advancements and applications of open MRI systems in medical imaging.
  • To compare the efficacy and patient experience of open MRI versus closed MRI systems.
  • To explore the potential of open MRI for interventional procedures.

Main Methods:

  • Review of existing literature on open and closed MRI system designs and performance.

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  • Comparison of image quality, magnetic field strength, and examination times between open and closed MRI systems.
  • Analysis of patient comfort and accessibility factors associated with different MRI configurations.

    • Main Results:

    • Early open MRI scanners had limitations in magnetic field strength, image quality, and scan duration.
    • Recent advancements have led to newer open MRI systems with higher magnetic field strengths and improved image quality.
    • Closed, high-field MRI scanners with wide-bore designs offer enhanced patient comfort and may serve as an alternative to open systems.

    Conclusions:

    • Open MRI systems provide a viable alternative for patients who cannot tolerate closed MRI scanners.
    • Technological improvements are enhancing the performance and applicability of open MRI technology.
    • Open MRI systems show promise for intra-operative and image-guided interventions, expanding their clinical utility.