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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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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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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Updated: Jul 9, 2025

Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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The relaxometry hype cycle.

Nikola Stikov1,2,3, Agâh Karakuzu1,2

  • 1Polytechnique Montréal, Montreal, QC, Canada.

Frontiers in Physiology
|November 29, 2023
PubMed
Summary
This summary is machine-generated.

Relaxometry, a field with a complex history, is explored through an impressionistic overview. This review uses the Gartner hype cycle to examine its past, present, and future trajectory.

Keywords:
MRIT1 mappingT2 mappingquantitative MRI (qMRI)relaxometryreproducibility

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Area of Science:

  • Physics
  • Materials Science
  • Biophysics

Background:

  • Relaxometry has a rich yet contentious history, marked by significant innovations and challenges.
  • The field's development is characterized by cycles of high expectations followed by disillusionment.

Purpose of the Study:

  • To provide an impressionistic overview of the field of relaxometry.
  • To analyze the historical trajectory of relaxometry using the Gartner hype cycle model.
  • To offer personal opinions and insights into the future of relaxometry.

Main Methods:

  • Qualitative review and historical analysis.
  • Application of the Gartner hype cycle framework to understand technology adoption and evolution.
  • Personal commentary and expert opinion on the field's progress.

Main Results:

  • Relaxometry's history mirrors the Gartner hype cycle, moving from technology triggers through inflated expectations and disillusionment.
  • The field is progressing towards the 'slope of enlightenment' and 'slope of productivity' phases.
  • Future developments are anticipated with second and third-generation products and mainstream adoption.

Conclusions:

  • The historical context provided by the hype cycle offers valuable perspective on relaxometry's current standing.
  • Continued innovation and refinement are expected to drive relaxometry towards greater productivity and adoption.
  • The future of relaxometry appears promising, with potential for significant advancements and broader application.