Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Single-shot GRASE imaging with short effective TEs

G Johnson1, D A Feinberg, V Venkataraman

  • 1Department of Radiology, New York University Medical Center, NY 10016, USA.

Journal of Magnetic Resonance Imaging : JMRI
|November 1, 1996
PubMed
Summary

A novel centric phase-encoding scheme for gradient- and spin-echo (GRASE) imaging significantly reduces echo time and enhances signal-to-noise ratios. This advanced technique improves brain imaging quality and has applications in diffusion and velocity imaging.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Evaluation of highly accelerated simultaneous multi-slice EPI for fMRI.

NeuroImage·2014
Same author

Single-shot 3D GRASE with cylindrical k-space trajectories.

Magnetic resonance in medicine·2008
Same author

In vitro evaluation of platinum Guglielmi detachable coils at 3 T with a porcine model: safety issues and artifacts.

Radiology·2001
Same author

Ultrafast magnetic resonance imaging. A new window on brain research.

Science (New York, N.Y.)·1998
Same author

VET imaging: magnetic resonance imaging with variable encoding time.

Magnetic resonance in medicine·1997
Same author

Segmentation analysis in functional MRI: activation sensitivity and gray-matter specificity of RARE and FLASH.

Journal of magnetic resonance imaging : JMRI·1997

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Radiology

Background:

  • Gradient- and spin-echo (GRASE) imaging is a vital MRI technique.
  • Conventional GRASE methods often involve sequential phase encoding, leading to longer echo times (TE).
  • Longer TEs can degrade image quality and limit applications like diffusion imaging.

Purpose of the Study:

  • To introduce a new phase-encoding scheme for GRASE imaging.
  • To reduce the effective echo time (TE) in GRASE sequences.
  • To improve signal-to-noise ratios (SNRs) and expand imaging applications.

Main Methods:

  • Developed a centric phase-encoding order for GRASE imaging, differing from traditional sequential methods.
  • Implemented the sequence in single-shot acquisitions utilizing high-performance gradients.

Related Experiment Videos

  • Acquired approximately 144 phase-encoding lines within a 390 ms echo train time.

    • Main Results:

    • Achieved a significantly shorter effective TE of 8 ms with centric encoding, compared to 75 ms with sequential encoding.
    • Observed 50-70% higher signal-to-noise ratios (SNRs) in brain tissue using the new scheme.
    • Demonstrated the feasibility of acquiring numerous phase-encoding lines rapidly.

    Conclusions:

    • The novel centric phase-encoding scheme offers substantial improvements in GRASE imaging efficiency and quality.
    • Reduced TE and enhanced SNR make the sequence highly suitable for advanced applications.
    • This technique holds promise for improved diffusion and velocity imaging.