High-resolution computed tomography for clinical imaging of bone microarchitecture

Area of Science:

• Medical Imaging
• Orthopedics
• Biomedical Engineering

Background:

• Bone structure is a key determinant of bone strength and quality.
• High-resolution imaging has transitioned from ex vivo to in vivo human studies for bone analysis.
• Challenges persist in translating high-resolution imaging techniques into clinical outcomes.

Purpose of the Study:

• Review the use of high-resolution CT for evaluating bone trabecular and cortical structure.
• Examine the extension of these techniques to in vivo human imaging.
• Analyze studies applying high-resolution CT to characterize bone structure in skeletal diseases.

Main Methods:

• Literature review conducted using PubMed and Google Scholar.
• Keywords included CT, MDCT, micro-CT, high-resolution peripheral CT, bone microarchitecture, and bone quality.
• Focus on evaluating bone structure and its relation to bone quality.

Main Results:

• Micro-CT achieves resolutions down to 1 μm for specimens; in vivo human imaging is limited to 82 μm voxel size (approx. 130 μm spatial resolution) due to technical and radiation constraints.
• In vivo imaging is currently restricted to peripheral sites like the wrist and tibia.
• Multidetector CT (MDCT) can image the central skeleton but has lower resolution (200-500 μm) and higher radiation dose.

Conclusions:

• CT provides quantitative bone structure measures for mathematical bone strength estimation.
• These techniques can enhance understanding of fracture risk.
• CT may establish the efficacy of anti-fracture treatments for osteoporosis and bone metabolic disorders.