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Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
Apparent diffusion coefficient and fractional anisotropy in the vertebral bone marrow.
Yu Ueda1, Tosiaki Miyati, Naoki Ohno
1Department of Radiology, Kobe University Hospital, Kobe, Japan.
Journal of Magnetic Resonance Imaging : JMRI
|February 27, 2010
Summary
Apparent diffusion coefficient (ADC) and fractional anisotropy (FA) from MRI reveal insights into vertebral bone marrow. ADC correlates with bone mineral density (BMD) and fat fraction (FF), offering detailed cancellous tissue analysis.
Area of Science:
- Biomedical Imaging
- Bone Physiology
- Quantitative MRI
Background:
- Cancellous bone structure and metabolism are crucial for skeletal health.
- Magnetic Resonance Imaging (MRI) offers non-invasive methods to assess bone tissue characteristics.
Purpose of the Study:
- To evaluate the utility of apparent diffusion coefficient (ADC) and fractional anisotropy (FA) in characterizing vertebral cancellous bone marrow.
- To investigate the correlations between diffusion parameters (ADC, FA), bone mineral density (BMD), and bone marrow fat fraction (FF).
Main Methods:
- 1.5 T MRI with diffusion echo planar imaging was employed to acquire ADC and FA values.
- Apparent diffusion coefficient (ADC) and fractional anisotropy (FA) were calculated for lumbar vertebral bone marrow in 11 healthy subjects.
- Bone mineral density (BMD) was measured using dual-energy x-ray absorptiometry (DXA), and bone marrow fat fraction (FF) was determined using spectral presaturation with inversion recovery (SPIR).
Main Results:
- A significant negative correlation was observed between ADC and BMD in vertebral bone marrow, particularly at low to moderate fat fractions.
- Apparent diffusion coefficient (ADC) showed a significant positive correlation with fat fraction (FF).
- Fractional anisotropy (FA) demonstrated a positive correlation with bone mineral density (BMD) but no significant correlation with fat fraction (FF).
Conclusions:
- Diffusion MRI parameters, specifically ADC and FA, provide valuable quantitative information about cancellous bone tissue structure and metabolism.
- These diffusion metrics can enhance the understanding of bone quality beyond traditional BMD measurements.
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