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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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Increased speed and image quality in single-shot fast spin echo imaging via variable refocusing flip angles.

Andreas M Loening1, Manojkumar Saranathan1, Nichanan Ruangwattanapaisarn1,2

  • 1Department of Radiology, Stanford University School of Medicine, Stanford, California, USA.

Journal of Magnetic Resonance Imaging : JMRI
|June 23, 2015
PubMed
Summary

A new MRI technique, variable refocusing flip angle single-shot fast spin echo (vrfSSFSE), significantly speeds up abdominal scans at 3T. This method also enhances image quality, improving visualization of organs like the pancreas and kidneys.

Keywords:
echo stabilizationsingle shot fast spin echospecific absorption ratevariable refocusing flip angle

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Conventional single-shot fast spin echo (SSFSE) sequences in MRI are limited by acquisition time and specific absorption rate (SAR).
  • Optimizing pulse sequences is crucial for improving diagnostic efficiency and patient comfort in clinical MRI.

Purpose of the Study:

  • To develop and validate a novel vrfSSFSE sequence for 3T abdominal MRI.
  • To reduce acquisition times by lowering SAR and enhance overall image quality.

Main Methods:

  • Designed and implemented a vrfSSFSE sequence, determining optimal flip angle modulation parameters through simulations and volunteer scans.
  • Conducted patient scans comparing conventional SSFSE with half-Fourier and full-Fourier vrfSSFSE at 3T.
  • Utilized blinded radiologist scoring for semiquantitative assessment of image quality parameters.

Main Results:

  • The vrfSSFSE sequence achieved approximately a 2-fold increase in speed (P < 0.0001).
  • Full-Fourier vrfSSFSE demonstrated significant improvements in contrast, sharpness, and visualization of pancreatic and renal structures.
  • vrfSSFSE also showed decreased image noise and enhanced renal structure visualization with equal bandwidth techniques.

Conclusions:

  • vrfSSFSE offers a significant speed advantage over conventional SSFSE at 3T due to reduced SAR.
  • Combining vrfSSFSE with full-Fourier acquisition enhances image quality, though it may increase sensitivity to cardiac motion-related signal loss.