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

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

3.0K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
3.0K
Bode Plots01:26

Bode Plots

1.6K
Bode plots are graphical tools that use logarithmic scales for frequency on the x-axis and gain in decibels on the y-axis. This logarithmic method allows a wide range of frequencies to be compactly displayed, enabling the analysis of component effects on circuit behavior across a broad frequency spectrum.
A network function represents the ratio of a system's output to its input, with the magnitude and phase angle derived from the complex network function. The decibel logarithmic gain is...
1.6K
Bode Plots Construction01:24

Bode Plots Construction

1.3K
The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
1.3K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.7K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.7K

You might also read

Related Articles

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

Sort by
Same author

A Dynamic Shim Approach for Correcting Eddy Current Effects in Diffusion-Prepared MRI Acquisition Using a Multi-Coil AC/DC Shim-Array.

Magnetic resonance in medicine·2026
Same author

Adult brain T1 and T2 values measured at 3 T using magnetic resonance fingerprinting with phantom validation.

Journal of applied clinical medical physics·2025
Same author

OPTIKS: Optimized Gradient Properties Through Timing in k-Space.

IEEE transactions on medical imaging·2025
Same author

Engineering the Colloidal Properties of Iron Oxide Nanoparticles for High <i>T</i> <sub>1</sub> MRI Contrast at 64 mT.

ACS applied nano materials·2025
Same author

Limitations of 2-dimensional line-scan MRI for directly measuring neural activity.

Imaging neuroscience (Cambridge, Mass.)·2025
Same author

Open-source, customizable phantom for low-field magnetic resonance imaging.

Magma (New York, N.Y.)·2025
Same journal

A Comparison of Tissue Property Values Estimated Using Conventional Cardiac MRF and MT-Cardiac MRF.

Magnetic resonance in medicine·2026
Same journal

Dependence of the Extra-Cellular Diffusion Coefficient on the Fractions of Neurites and Cell Bodies in Gray Matter.

Magnetic resonance in medicine·2026
Same journal

Triple-Pulse <sup>23</sup>Na MRI Sequence (TriNa) for Simultaneous Acquisition of Spin-Density-Weighted and Fluid-Attenuated Images.

Magnetic resonance in medicine·2026
Same journal

Evaluation of Phantom Doping Materials in Quantitative Susceptibility Mapping.

Magnetic resonance in medicine·2026
Same journal

Design of an 8-Channel Transmit 32-Channel Receive 11.7T Head Coil and Evaluation of SNR Gains.

Magnetic resonance in medicine·2026
Same journal

The Potential for Absolute Temperature Imaging Based on Brain Metabolites Using an FID-Shifting Approach in Gradient Echo Planar Spectroscopic Imaging (GREPSI).

Magnetic resonance in medicine·2026
See all related articles

Related Experiment Video

Updated: Mar 27, 2026

In vivo 19F MRI for Cell Tracking
10:05

In vivo 19F MRI for Cell Tracking

Published on: November 25, 2013

15.6K

Measuring B1 distributions by B1 phase encoding.

Kalina V Jordanova1, Dwight G Nishimura1, Adam B Kerr1

  • 1Department of Electrical Engineering, Magnetic Resonance Systems Research Laboratory, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine
|January 19, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for acquiring B1 distribution data by encoding in B1 space, enabling rapid, high dynamic range measurements. This technique bypasses traditional spatial B1 mapping, offering faster B1 field estimation for applications like scanner calibration.

Keywords:
B1 distributionsB1 mapping

More Related Videos

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
10:51

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

Published on: March 10, 2011

14.3K
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

10.5K

Related Experiment Videos

Last Updated: Mar 27, 2026

In vivo 19F MRI for Cell Tracking
10:05

In vivo 19F MRI for Cell Tracking

Published on: November 25, 2013

15.6K
An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
10:51

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

Published on: March 10, 2011

14.3K
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

10.5K

Area of Science:

  • Magnetic Resonance Imaging
  • Quantitative MRI

Background:

  • Accurate B1 field mapping is crucial for quantitative MRI.
  • Traditional spatial B1 mapping can be time-consuming and may struggle with high dynamic ranges.

Purpose of the Study:

  • To develop and validate a method for acquiring B1 distribution information directly, without spatial B1 mapping.
  • To enable faster measurement of high dynamic range B1 data.

Main Methods:

  • Encoding data in B1 space instead of image space.
  • Acquiring multiple slice projections with varying phase sensitivity to B1.
  • Utilizing convex optimization to reconstruct B1 distribution histograms.

Main Results:

  • In vivo measurements were validated against spatial B1 maps using Earth Mover's Distance.
  • Phantom studies demonstrated improved accuracy and reduced measurements compared to low-resolution spatial maps, with a 37% decrease in Earth Mover's Distance.
  • The method accurately estimates B1 distributions even with increased spatial variations.

Conclusions:

  • A novel method for acquiring B1 distribution information directly has been proposed and validated.
  • This approach offers faster B1 field estimation, particularly beneficial for applications like transmit gain calibration and high dynamic B1 ranges.
  • The method eliminates the need for spatial B1 maps, streamlining quantitative MRI protocols.