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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Double Resonance Techniques: Overview01:12

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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.
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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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.
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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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...
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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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New methods for robust continuous wave T1ρ relaxation preparation.

Swetha Pala1, Nina E Hänninen1,2, Olli Nykänen1,2

  • 1Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.

NMR in Biomedicine
|September 17, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces robust continuous wave (CW) T1ρ (longitudinal relaxation time in the rotating frame) methods insensitive to magnetic field (B0) and RF pulse (B1) variations. Refocused preparation schemes demonstrated superior performance and robustness against field inhomogeneities.

Keywords:
Bloch simulationT1ρ relaxationcontrastfield inhomogeneityrotating frame of reference

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Medical Physics

Background:

  • Longitudinal relaxation time in the rotating frame (T1ρ) measurements are crucial for MRI but sensitive to magnetic field (B0) and RF pulse (B1) inhomogeneities.
  • Existing T1ρ contrast generation methods often suffer from reduced accuracy in the presence of field variations.

Purpose of the Study:

  • To develop and evaluate continuous wave (CW) T1ρ contrast methods with enhanced robustness against B0 and B1 field inhomogeneities.
  • To compare the sensitivity of various existing and novel T1ρ preparation schemes to field variations.

Main Methods:

  • Investigated four hard-pulse and four adiabatic CW-T1ρ magnetization preparations.
  • Conducted Bloch simulations and experimental measurements under varying spin-lock amplitudes and field conditions.
  • Performed theoretical analysis of hard-pulse preparations to assess sensitivity to field inhomogeneities at low and high spin-locking field strengths.

Main Results:

  • Refocused hard-pulse (single-refocus, triple-refocus) and adiabatic (double-refocus) preparation schemes showed the highest robustness in simulations.
  • Experimental measurements confirmed that refocused preparations had the smallest deviation between ideal and non-ideal conditions.
  • All experimentally tested refocused preparations outperformed non-refocused ones.

Conclusions:

  • Promotes the use of the single-refocus hard-pulse T1ρ method for its robustness, minimal RF energy deposition, and insensitivity to B0 and B1 variations.
  • The double-refocus adiabatic CW-T1ρ preparation offers superior insensitivity to field variations, suitable for ex vivo applications due to higher RF energy deposition.