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Related Concept Videos

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...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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...
Effects of EDTA on End-Point Detection Methods01:18

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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
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Related Experiment Video

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Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
11:44

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Published on: November 12, 2016

pCEST: Positive contrast using Chemical Exchange Saturation Transfer.

Elena Vinogradov1, Todd C Soesbe, James A Balschi

  • 1Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. elena.vinogradov@utsouthwestern.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 13, 2012
PubMed
Summary

Positive Chemical Exchange Saturation Transfer (pCEST) offers a novel imaging method. This technique enhances signal intensity for improved detection and background suppression in MRI contrast agents.

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Chemical Physics

Background:

  • Chemical Exchange Saturation Transfer (CEST) relies on pre-saturating protons, causing a decrease in bulk water signal.
  • Traditional CEST contrast is negative, making detection challenging against strong background signals.
  • Existing methods require sensitive detection of small signal changes.

Purpose of the Study:

  • To develop a novel Positive CEST (pCEST) detection scheme.
  • To achieve positive contrast (increased signal intensity) for enhanced agent detection.
  • To simultaneously achieve substantial background signal suppression.

Main Methods:

  • Utilized the analogous properties of CEST and off-resonance T(1)(ρ) experiments.
  • Explored increased apparent relaxation rates under selective pre-saturation.
  • Developed a new detection scheme for positive contrast imaging.

Main Results:

  • Demonstrated a pCEST method yielding positive contrast, i.e., increased signal intensity.
  • Achieved significant suppression of background signals.
  • Showcased contrast that can be switched 'ON' and 'OFF', similar to traditional CEST.

Conclusions:

  • pCEST provides a valuable alternative to traditional CEST imaging.
  • The positive contrast and background suppression enhance MRI agent detection.
  • This technique offers tunable contrast for advanced imaging applications.