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

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

829
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...
829
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.9K
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.
1.9K

You might also read

Related Articles

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

Sort by
Same author

Identification of Potential Biomarkers for Intervention of AMG-176 in the Chronic Lymphocytic Leukemia Based on Untargeted Metabolomic Analysis.

Indian journal of hematology & blood transfusion : an official journal of Indian Society of Hematology and Blood Transfusion·2026
Same author

A Cuproptosis-related lncRNA Signature for Prognostic Stratification and Immunotherapeutic Implications in Lung Adenocarcinoma.

Current molecular medicine·2026
Same author

Ferroptotic resistance involved in PTEN-loss prostate cancer progression.

Discover oncology·2025
Same author

Formal Reductive Amination of Carboxylic Acids via Iron-Catalyzed Photoredox Decarboxylative α-Aminomethylation.

Organic letters·2025
Same author

Programmed-Cell-Death-Related Signature Reveals Immune Microenvironment Characteristics and Predicts Therapeutic Response in Diffuse Large B Cell Lymphoma.

Biomedicines·2025
Same author

SUMOylation-related genes define prognostic subtypes in stomach adenocarcinoma: integrating single-cell analysis and machine learning analyses.

Frontiers in immunology·2025
Same journal

Localization-driven exchange contrast in diffusion exchange spectroscopy.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

4.5 Tesla superconducting miniature magnet in liquid nitrogen.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Folding and unfolding dynamics of a DNA aptamer studied by heteronuclear <sup>1</sup>H-<sup>13</sup>C correlation zz-exchange spectroscopy.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Multi-spin control from one-spin pulses.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Altering MRI rotating frame relaxations by changing the truncation level of Hyperbolic Secant pulse.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Effects of proton exchange on the lifetimes of long-lived states in aliphatic chains.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
See all related articles

Related Experiment Video

Updated: Mar 8, 2026

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the &#181;s-ms Timescale
08:09

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale

Published on: April 19, 2021

6.3K

An adaptive method for determining an acquisition parameter t0 in a modified CPMG sequence.

Donghui Xing1, Yiren Fan1, Jianfei Hao2

  • 1School of Geosciences, China University of Petroleum, Qingdao 266580, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China; CNPC Key Well Logging Laboratory, China University of Petroleum, Qingdao 266580, China.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 23, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces an adaptive method to find the optimal t0 for modified Carr-Purcell-Meiboom-Gill (CPMG) sequences, improving magnetic field gradient measurements in rocks. The method ensures better signal-to-noise ratio and simplifies experimental procedures.

Keywords:
Adaptive methodDiscriminant factorInternal magnetic field gradientMaximum valueModified CPMG pulse sequenceNumerical simulation

More Related Videos

Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance
10:07

Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance

Published on: August 26, 2025

662
Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
08:40

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

Published on: January 20, 2022

4.9K

Related Experiment Videos

Last Updated: Mar 8, 2026

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the &#181;s-ms Timescale
08:09

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale

Published on: April 19, 2021

6.3K
Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance
10:07

Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance

Published on: August 26, 2025

662
Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
08:40

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

Published on: January 20, 2022

4.9K

Area of Science:

  • Geophysics
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Petrophysics

Background:

  • The modified Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence is crucial for measuring internal magnetic field gradients in rock formations.
  • The acquisition parameter t0 (first window duration) significantly impacts the accuracy of these measurements.
  • Current methods for determining optimal t0 can be complex and challenging.

Purpose of the Study:

  • To develop an adaptive method for determining the optimal t0 in modified CPMG sequences.
  • To enhance the accuracy and efficiency of measuring magnetic field gradient distribution in formation rocks.
  • To simplify the operational procedures for T2-G experiments.

Main Methods:

  • Utilized T2-G forward numerical simulations to study the discriminant factor sigma and its relationship with t0.
  • Identified that the optimal t0 corresponds to the maximum value of sigma.
  • Incorporated the signal-to-noise ratio (SNR) constraint of spin echo to refine the determination of optimal t0.

Main Results:

  • Established a correlation between the discriminant factor sigma and the optimal t0.
  • Demonstrated that the adaptive method effectively determines the optimal t0 for modified CPMG sequences.
  • Verified the proposed method through T2-G experiments on water-saturated sandstone samples.

Conclusions:

  • The proposed adaptive method simplifies T2-G experiments by providing an optimal t0.
  • This approach improves the measurement of internal magnetic field gradient distribution in formation rocks.
  • The findings offer a more accessible and efficient technique for petrophysical analysis using NMR.