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Depth-dependent proton magnetization transfer in articular cartilage.
Ravinder R Regatte1, Sarma V S Akella, Ravinder Reddy
1Department of Radiology, Centre for Biomedical Imaging, New York University School of Medicine, 301 East 17th Street, New York, NY 10003, USA. Ravinder.regatte@med.nyu.edu
Journal of Magnetic Resonance Imaging : JMRI
|July 20, 2005
Summary
Proton magnetization transfer ratio (MTR) in bovine patellar cartilage increases with depth and mechanical compression. Collagen depletion decreases MTR, highlighting its role in cartilage structure and water content.
Area of Science:
- Biomedical Engineering
- Biophysics
- Orthopedics
Background:
- Cartilage degeneration is a hallmark of osteoarthritis.
- Proton magnetization transfer ratio (MTR) is a quantitative magnetic resonance imaging (MRI) technique sensitive to macromolecular content.
- Understanding cartilage biomechanics and composition is crucial for diagnosing and treating joint diseases.
Purpose of the Study:
- To measure proton magnetization transfer ratio (MTR) maps in bovine patellar cartilage.
- To investigate the effects of collagen depletion and mechanical compression on MTR.
- To assess MTR as a function of cartilage depth.
Main Methods:
- One-dimensional proton projection MRI and fast spin-echo (FSE) sequences were used.
- Custom-built MR-compatible pressure cell for dynamic mechanical compression.
- MTR maps were quantified in normal and collagen-depleted bovine patellar cartilage specimens.
Main Results:
- MTR values increased continuously with cartilage depth in all specimens.
- Collagen depletion led to decreased MTR values.
- Mechanical compression increased MTR values, potentially due to reduced water content and increased collagen concentration.
Conclusions:
- Bovine patellar cartilage MTR is depth-dependent, with higher values in the radial zone compared to the superficial zone.
- MTR is influenced by collagen content, macromolecular arrangement, solid content, and bound water fraction.
- MTR is a sensitive biomarker for assessing cartilage composition and structural integrity.