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Assessing post-traumatic changes in cartilage using T1ρ dispersion parameters.

Hassaan Elsayed1, Jouni Karjalainen1, Mikko J Nissi2

  • 1Research Unit of Health Sciences and Technology, Faculty of Medicine, University of Oulu, P.O.Box 5000, 90014 Oulu, Finland; Medical Research Center Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland.

Magnetic Resonance Imaging
|January 7, 2023
PubMed
Summary

Quantitative MRI using T1ρ dispersion parameters can detect early cartilage degeneration. While some parameters offer refined insights into biochemical composition, they primarily complement, rather than replace, conventional MRI techniques for osteoarthritis assessment.

Keywords:
Articular cartilageCorrelation timeOsteoarthritisQuantitative MRIRelaxation dispersionRelaxation time

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Osteoarthritis Research

Background:

  • Articular cartilage degeneration, a hallmark of osteoarthritis, can be non-invasively assessed using quantitative magnetic resonance imaging (MRI).
  • T1ρ (T1 rho) measurements, tunable by spin-lock pulse amplitude, show promise for early osteoarthritis detection.
  • T1ρ dispersion, derived from measurements at multiple amplitudes, may offer additional diagnostic information.

Purpose of the Study:

  • To investigate if T1ρ dispersion parameters provide diagnostically relevant information complementary to single-amplitude T1ρ measurements in evaluating cartilage degeneration.
  • To assess the sensitivity of five T1ρ dispersion parameters (A, B, τc, T1ρ/T2, R2 - R1ρ) in detecting degenerative changes.
  • To explore the correlation of these dispersion parameters with established histological and biomechanical reference standards.

Main Methods:

  • Utilized an open dataset from an equine model of post-traumatic cartilage degeneration.
  • Acquired and analyzed five distinct T1ρ dispersion parameters: A, B, τc, T1ρ/T2, and R2 - R1ρ.
  • Compared parameter sensitivity for detecting degeneration and correlated them with histological (optical density) and biomechanical (collagen fibril angle) data.

Main Results:

  • Parameters A, T1ρ/T2, and R2 - R1ρ demonstrated sensitivity to lesion-induced cartilage changes.
  • Several dispersion parameters exhibited strong correlations with optical density and collagen fibril angle.
  • Most dispersion parameters showed significant correlation with individual T1ρ values.

Conclusions:

  • T1ρ dispersion parameters can provide a more accurate description of cartilage biochemical composition compared to conventional MRI parameters in specific cases.
  • The diagnostic information from dispersion parameters often serves as a refinement of, rather than a complement to, conventional quantitative MRI findings.
  • Further research is warranted to fully elucidate the complementary role of T1ρ dispersion in clinical osteoarthritis assessment.