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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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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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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Rapid field-cycling MRI using fast spin-echo.

P James Ross1, Lionel M Broche, David J Lurie

  • 1Aberdeen Biomedical Imaging Centre, Musculoskeletal group, School of Medicine and Dentistry, University of Aberdeen, United Kingdom.

Magnetic Resonance in Medicine
|April 23, 2014
PubMed
Summary
This summary is machine-generated.

Fast field-cycling MRI (FFC-MRI) was adapted using a field-cycling fast spin-echo (FC-FSE) sequence, significantly reducing scan times. This faster FFC-MRI technique maintains image quality and relaxometric accuracy for potential clinical use.

Keywords:
dispersion curvefield-cyclingquadrupole peaksrelaxometric imaging

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Medical Imaging Technology

Background:

  • Conventional MRI has diagnostic limitations.
  • Fast field-cycling MRI (FFC-MRI) offers new contrast but requires long scan times.
  • Adapting FFC-MRI is crucial for clinical applications.

Purpose of the Study:

  • Introduce a faster FFC-MRI technique: field-cycling fast spin-echo (FC-FSE).
  • Reduce scan times for FFC-MRI.
  • Expand diagnostic capabilities of MRI.

Main Methods:

  • Adapted the fast spin-echo (FSE) pulse sequence for FFC-MRI.
  • Evaluated image quality and relaxometric accuracy using phantoms.
  • Acquired in-vivo relaxometric images from a human volunteer.

Main Results:

  • FC-FSE achieved speedup factors up to 4-fold with good image quality.
  • Relaxometry data showed good agreement with conventional techniques.
  • In-vivo results demonstrated sensitivity to quadrupole peaks.

Conclusions:

  • FC-FSE provides a viable method for faster FFC-MRI with minimal loss in quality or accuracy.
  • Phantom and initial in-vivo results support future clinical studies.
  • This technique enhances the potential of FFC-MRI for clinical diagnosis.