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Related Concept Videos

Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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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.
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Quantification of Mouse Heart Left Ventricular Function, Myocardial Strain, and Hemodynamic Forces by Cardiovascular Magnetic Resonance Imaging
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Fast REDOR with CPMG multiple-echo acquisition.

Ivan Hung1, Zhehong Gan1

  • 1Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 10, 2013
PubMed
Summary
This summary is machine-generated.

A new CPMG-REDOR method significantly speeds up solid-state NMR distance measurements. This technique enhances Rotational-Echo Double Resonance (REDOR) experiments by an order of magnitude, improving efficiency for structural analysis.

Keywords:
Bloch–Siegert shiftCPMGDipolar couplingDistance measurementMASMagic-angle spinningREDORUltrafast

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Structural biology and materials science.

Background:

  • Rotational-Echo Double Resonance (REDOR) is a key technique for measuring distances between nuclei in solid samples.
  • Conventional REDOR experiments are time-consuming due to point-by-point signal acquisition under magic-angle spinning (MAS).

Purpose of the Study:

  • To introduce a modified Carr-Purcell Meiboom-Gill (CPMG) multiple-echo scheme for accelerated REDOR measurements.
  • To enable fast, real-time REDOR experiments for enhanced efficiency in distance determination.

Main Methods:

  • Implementation of a modified CPMG pulse sequence integrated with REDOR recoupling.
  • Measurement of REDOR curves by analyzing CPMG echo amplitude modulation.
  • Investigation of factors influencing signal acquisition, including hetero-nuclear recoupling, Bloch-Siegert shifts, and echo truncation.

Main Results:

  • The developed CPMG-REDOR experiment achieves measurements an order of magnitude faster than conventional methods.
  • Demonstration of the feasibility and significant speed-up of real-time REDOR measurements.
  • Detailed analysis of the impact of experimental artifacts on signal quality.

Conclusions:

  • The CPMG-REDOR approach offers a substantial advancement for rapid distance measurements in solid-state NMR.
  • This method improves experimental throughput for structural studies of solids.
  • Understanding the effects of recoupling, Bloch-Siegert shifts, and echo truncation is crucial for accurate data interpretation.