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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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.
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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.
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.

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Related Experiment Video

Updated: Jul 7, 2026

Real-Time fMRI Brain Mapping in Animals
04:05

Real-Time fMRI Brain Mapping in Animals

Published on: September 24, 2020

Real-time interactive NMR image synthesis.

M H Kuhn, W Menhardt, I C Carlsen

    IEEE Transactions on Medical Imaging
    |January 1, 1985
    PubMed
    Summary

    This study introduces real-time NMR image synthesis using proton density and relaxation data. This method enhances educational use and diagnostic image evaluation for optimal contrast.

    Area of Science:

    • Medical Imaging
    • Biophysics
    • Computational Science

    Background:

    • Nuclear Magnetic Resonance (NMR) imaging is crucial for medical diagnostics.
    • Optimizing image contrast often requires adjusting pulse sequence parameters, which can be time-consuming.
    • Real-time manipulation of NMR image parameters is desirable for both education and clinical application.

    Purpose of the Study:

    • To develop a method for real-time synthesis of NMR images.
    • To enable arbitrary pulse sequence timing parameter adjustments post-acquisition.
    • To provide a tool for enhanced educational and diagnostic NMR image evaluation.

    Main Methods:

    • A novel method synthesizes NMR images based on pre-calculated proton density and relaxation time maps.
    • User input via trackball allows real-time adjustment of pulse sequence timing parameters.

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  • The technique utilizes data from a specialized pulse sequence for generating density and relaxation images.

    • Main Results:

    • Demonstrated real-time synthesis of NMR images for variable pulse sequence timing.
    • Presented examples for Spin Echo and Inversion Recovery pulse sequences.
    • Showcased the method's utility in achieving optimal image contrast dynamically.

    Conclusions:

    • The developed method enables real-time NMR image synthesis, offering flexibility in parameter selection.
    • This approach serves as a valuable educational tool for understanding NMR imaging principles.
    • The technique facilitates rapid diagnostic evaluation by allowing users to optimize image contrast interactively.