Trabecular Bone Assessment Using Magnetic-Resonance Imaging: A Pilot Study

Area of Science:

• Biomedical Engineering
• Radiology
• Orthopedics

Background:

• Trabecular bone morphology is crucial for skeletal health assessment.
• Microcomputed tomography (µCT) is a standard for high-resolution bone analysis.
• Magnetic-resonance imaging (MRI) offers a non-invasive alternative for bone evaluation.

Purpose of the Study:

• To evaluate the accuracy of MRI in characterizing trabecular bone morphology.
• To compare MRI-derived parameters with µCT measurements in porcine bone samples.
• To identify potential biases and correlations in MRI-based bone analysis.

Main Methods:

• Porcine bone samples were scanned using T1-weighted turbo spin echo MRI and µCT.
• Key trabecular bone parameters including Bone Volume (BV), Bone-Volume fraction (BvTv), Bone specific surface (BsBv), trabecular thickness (TbTh), and trabecular separation (TbSp) were quantified.
• Statistical analyses included paired t-tests and Pearson correlation tests (p=0.05).

Main Results:

• MRI generally overestimated BV, BvTv, TbTh, and TbSp compared to µCT.
• Bone specific surface (BsBv) was the only parameter underestimated by MRI.
• A high statistical correlation (r=0.826, p<0.05) was observed for BV measurements between MRI and µCT.

Conclusions:

• MRI can assess trabecular bone morphology but exhibits a consistent overestimation bias for several key parameters.
• Despite overestimations, MRI demonstrated significant linear correlation with µCT for BV, suggesting potential for quantitative bone analysis.
• Further optimization of MRI sequences and analysis methods is warranted to improve accuracy and reliability in trabecular bone assessment.