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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,...
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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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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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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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Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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Ultrafast bold fMRI using single-shot spin-echo echo planar imaging.

Saïd Boujraf1, Paul Summers, Faouzi Belahsen

  • 1Department of Biophysics and Clinical MRI Methods, Faculty of Medicine and Pharmacy, University of Fez, Fez, Morocco.

Journal of Medical Physics
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Sensitivity Encoding (SENSE) with single-shot spin-echo echo-planar imaging (SS-SE EPI) improves functional MRI quality at 3 Tesla. This technique reduces artifacts, enhancing the accuracy of brain activity localization.

Keywords:
Bold-fMRITeslaparallel imagingsensespin-echo echo planar imaging

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging
  • Functional Magnetic Resonance Imaging (fMRI)

Background:

  • Functional MRI (fMRI) imaging parameters critically influence functional localization accuracy.
  • Parallel imaging techniques like Sensitivity Encoding (SENSE) enhance sampling efficiency in echo-planar imaging (EPI).
  • SENSE application in single-shot (SS) EPI aids in reducing susceptibility artifacts and improving spatial resolution.

Purpose of the Study:

  • To investigate the blood oxygenation-dependent (BOLD) response of a SENSE-adapted spin-echo EPI (SE-EPI) sequence at 3 Tesla.
  • To evaluate the impact of SENSE on image quality and artifact reduction in SS-SE EPI at high magnetic field strengths.
  • To assess the specificity of SENSE-adapted SE-EPI for oxygenation changes in the microvasculature.

Main Methods:

  • Whole-brain fMRI studies were conducted on seven healthy volunteers using a 3 Tesla scanner.
  • A single-shot spin-echo EPI (SS-SE EPI) sequence incorporating SENSE was employed.
  • Data processing involved statistical parametric mapping for both group and individual subject analyses.

Main Results:

  • SENSE significantly reduced susceptibility artifacts in the acquired BOLD images.
  • The SS-SE EPI sequence with SENSE produced BOLD images free from typical quadrature artifacts.
  • Individual subject analyses quantified BOLD signal changes and activation cluster sizes in the primary motor cortex (M1).

Conclusions:

  • SENSE-adapted SS-SE EPI is crucial for high-field fMRI, offering improved image quality and artifact reduction.
  • This technique demonstrates enhanced specificity for detecting oxygenation changes within the microvasculature.
  • SENSE-enabled SS-SE EPI facilitates robust investigation of functional brain activity at high magnetic fields.