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

Analysis of flow effects in echo-planar imaging.

K Butts1, S J Riederer

  • 1Magnetic Resonance Laboratory, Mayo Clinic, Rochester, MN 55905.

Journal of Magnetic Resonance Imaging : JMRI
|May 1, 1992
PubMed
Summary
This summary is machine-generated.

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

Semi-automated vectorial analysis of anorectal motion by magnetic resonance defecography in healthy subjects and fecal incontinence.

Neurogastroenterology and motility·2012
Same author

Gastric motor disturbances in patients with idiopathic rapid gastric emptying.

Neurogastroenterology and motility·2011
Same author

Application of magnetic resonance imaging to measure fasting and postprandial volumes in humans.

Neurogastroenterology and motility·2008
Same author

Evaluation of endorectal and urethral cooling devices during MR-guided ultrasound thermal ablation in canine prostate.

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference·2007
Same author

MRI-guided laser thermal ablation: model to predict cell death from MR thermometry images for real-time therapy monitoring.

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference·2007
Same author

Feathering: Vertebral artery pseudostenosis with elliptical centric contrast-enhanced MR angiography.

AJNR. American journal of neuroradiology·2006

Spin phase shifts during echo-planar imaging (EPI) are affected by flow, especially in phase- and frequency-encoding directions. These effects, including displacement and ghosting, depend on flow velocity, sequence type, and gradient strength.

Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Physics

Background:

  • Echo-planar imaging (EPI) is a rapid MRI technique.
  • Understanding spin dynamics is crucial for accurate image reconstruction.
  • Flowing spins can introduce artifacts in MRI.

Purpose of the Study:

  • To investigate the impact of spin flow on EPI phase.
  • To analyze flow effects in different encoding directions.
  • To predict image artifacts based on flow parameters.

Main Methods:

  • Simulated EPI sequences: single-shot, multishot blipped EPI, and spiral k-space.
  • Analyzed flow effects in section-select, phase-encoding, and frequency-encoding directions.
  • Considered varying gradient strengths and slew rates.

Related Experiment Videos

Main Results:

  • Flow in section-select direction mirrors 2DFT acquisition effects.
  • Flow in phase/frequency-encoding directions causes significant deviations from 2DFT.
  • Quantified displacement, distortion, and ghosting based on flow velocity and sequence parameters.

Conclusions:

  • Flow in phase- and frequency-encoding directions significantly impacts EPI.
  • Artifact magnitude is predictable using flow velocity, sequence, and gradient characteristics.
  • High-velocity flow can lead to substantial blurring and displacement in EPI.