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An order parameter without magic angle effect (OPTIMA) derived from dispersion in ordered tissue.

Yuxi Pang1

  • 1Department of Radiology, University of Michigan, Ann Arbor, Michigan.

Magnetic Resonance in Medicine
|November 7, 2019
PubMed
Summary
This summary is machine-generated.

A new MRI method quantifies collagen degeneration in cartilage, overcoming the magic angle effect. This orientation-independent order parameter (S) shows promise as a biomarker for osteoarthritis and other tissue disorders.

Keywords:
anisotropic R2collagencorrelation timemagic angle effectorder parameter

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Biophysics

Background:

  • Magnetic Resonance (MR) R2 imaging is affected by the magic angle effect in ordered tissues like cartilage.
  • This effect can obscure subtle pathological changes, hindering accurate diagnosis.

Purpose of the Study:

  • To develop an orientation-independent order parameter (S) for MR imaging.
  • To create a parameter specifically sensitive to collagen degeneration in cartilage.

Main Methods:

  • A theoretical model was developed linking anisotropic R2 dispersion to molecular motion and correlation time.
  • The order parameter (S) was derived from this model.
  • Validation was performed using ex vivo and in vivo MR imaging of cartilage and human knee specimens at 9.4T and 3T.

Main Results:

  • The derived order parameter (S) showed significant correlation with orientation-dependent R2 dispersion.
  • S values were significantly lower in advanced osteoarthritis and collagen-depleted cartilage compared to controls.
  • A moderate correlation was observed for in vivo human knee imaging.

Conclusions:

  • The developed order parameter (S) is a potentially valuable MR biomarker.
  • It offers an orientation-independent measure of collagen alterations.
  • This parameter could be applied to cartilage and other structured tissues.