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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.
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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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Sodium Intensity Changes Differ Between Relaxation- and Density-Weighted MRI in Multiple Sclerosis.

Robert Stobbe1, Annie Boyd1, Penelope Smyth2

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New MRI techniques reveal elevated sodium in Multiple Sclerosis (MS) lesions, potentially linked to demyelination and edema. Normal-appearing white matter sodium levels remained unchanged, but specific signals correlated with cognitive function in MS patients.

Keywords:
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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)
  • Sodium MRI

Background:

  • The origin of increased tissue sodium concentration (TSC) in Multiple Sclerosis (MS) is not fully understood.
  • Potential causes include changes in intracellular sodium or tissue microstructure.
  • Investigating sodium's role in MS pathophysiology is crucial for understanding disease progression.

Purpose of the Study:

  • To investigate tissue sodium concentration (TSC) in Multiple Sclerosis (MS) using novel MRI sequences.
  • To differentiate between intracellular sodium changes and alterations in tissue microstructure.
  • To explore the relationship between sodium signals and clinical/cognitive evaluations in MS patients.

Main Methods:

  • Acquisition of three sodium MRI scans (NaDW, NaPACMAN, NaSIRFLA) at 4.7 T from 30 MS patients and 9 healthy controls.
  • Measurement of sodium signal in MS lesions and normal-appearing white matter (NAWM) relative to controls.
  • Correlation analysis between sodium signals and clinical/cognitive assessments (e.g., PASAT).

Main Results:

  • MS lesions showed significantly elevated sodium intensity compared to control white matter, particularly with NaPACMAN (75%) and NaDW (35%).
  • NaSIRFLA exhibited lower signal in specific lesion regions (-7%), while NAWM sodium levels were comparable to controls across all sequences.
  • NaSIRFLA signal in NAWM and posterior internal capsule positively correlated with the Paced Auditory Serial Addition Test (PASAT) scores.

Conclusions:

  • Findings suggest a demyelination model with edema explains elevated sodium in MS lesions.
  • A demyelination and atrophy model for NAWM aligns with observed sodium signal changes.
  • Combined sodium-density and relaxation-weighted MRI may offer insights into MS microstructural and metabolic alterations.