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 Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
Spin decoupling is usually achieved by...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...

You might also read

Related Articles

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

Sort by
Same author

A Sub-Microsecond Switch Enabling SWIFT <sup>23</sup>Na Imaging at 10.5 T.

Magnetic resonance in medicine·2026
Same author

Frame-wise multi-echo distortion correction for superior functional MRI.

Imaging neuroscience (Cambridge, Mass.)·2026
Same author

Predictive acoustical processing in human cortical layers.

Nature communications·2026
Same author

An 80-channel receive array for 10.5T neuroimaging: Key considerations for SNR optimization.

bioRxiv : the preprint server for biology·2026
Same author

Functional MRI of the Human Hippocampus at 10.5T: Pushing the Boundaries of Spatial Resolution.

bioRxiv : the preprint server for biology·2026
Same author

Bridging the gap with invasive imaging: promises and challenges of a new generation of ultrahigh resolution fMRI.

bioRxiv : the preprint server for biology·2026

Related Experiment Video

Updated: May 13, 2026

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
09:30

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

Multiband accelerated spin-echo echo planar imaging with reduced peak RF power using time-shifted RF pulses.

Edward J Auerbach1, Junqian Xu, Essa Yacoub

  • 1Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota 55455, USA. eja@umn.edu

Magnetic Resonance in Medicine
|March 8, 2013
PubMed
Summary

A novel method for generating multibanded radiofrequency (RF) pulses significantly reduces peak power demands for multiband slice-accelerated imaging. This advancement enables higher acceleration factors in diffusion-weighted MRI, shortening scan times.

More Related Videos

Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging
05:07

Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging

Published on: September 6, 2024

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
08:51

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Published on: February 19, 2021

Related Experiment Videos

Last Updated: May 13, 2026

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
09:30

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging
05:07

Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging

Published on: September 6, 2024

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
08:51

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Published on: February 19, 2021

Area of Science:

  • Magnetic Resonance Imaging
  • Pulse Sequence Design

Background:

  • Multiband slice acceleration in Magnetic Resonance Imaging (MRI) enhances imaging speed but is often limited by the high peak power requirements of multibanded radiofrequency (RF) pulses.
  • Existing methods struggle to balance acceleration factors with power constraints, particularly for spin-echo sequences like SE-fMRI and diffusion-weighted MRI.

Purpose of the Study:

  • To develop and evaluate an alternative method for generating multibanded RF pulses.
  • To substantially reduce peak power requirements for multiband slice-accelerated imaging without compromising bandwidth.
  • To enable higher acceleration factors in spin-echo MRI techniques.

Main Methods:

  • Generation of multibanded RF pulses using a "time-shifted" approach, introducing temporal delays between RF band applications to prevent constructive interference.
  • Acquisition of slice profiles and imaging data in phantoms and human subjects at 3 Tesla.

Main Results:

  • Time-shifted multibanded RF pulses were generated with minimal increase in peak power compared to single-banded pulses.
  • Improved slice profile quality was achieved by enabling higher pulse bandwidths.
  • Enhanced image quality resulted from the ability to attain optimal flip angles.

Conclusions:

  • A straightforward method effectively mitigates power limitations associated with multibanded RF pulses in spin-echo MRI.
  • This technique facilitates higher slice acceleration factors, proving particularly beneficial for accelerating lengthy diffusion-weighted MRI scans.
  • The approach holds significant potential for improving the efficiency and applicability of advanced MRI sequences.