Bone stiffness and strength at the distal radius can be determined using photon-counting CT

Area of Science:

• Biomedical Imaging
• Orthopedics
• Medical Physics

Background:

• Assessing bone strength is crucial for predicting osteoporotic fractures.
• High-resolution peripheral quantitative computed tomography (HR-pQCT) provides detailed bone microarchitecture but has limited clinical use.
• Photon-counting CT (PCCT) is a newer imaging modality with potential for bone strength quantification.

Purpose of the Study:

• To compare the accuracy of bone strength and stiffness measurements derived from PCCT and HR-pQCT.
• To evaluate the potential of PCCT for clinical assessment of osteoporotic fracture risk.

Main Methods:

• Cadaveric distal radius samples were scanned using both PCCT and HR-pQCT.
• Voxel-based finite element models were created from the CT images.
• Bone stiffness and strength were calculated using segmentation-based and density-based material models.

Main Results:

• Strong correlations (R² > 0.911) were observed between PCCT and HR-pQCT for bone stiffness, strength, and tissue proportions.
• Density-based models showed higher correlation and agreement (R² > 0.977) between the two CT techniques.
• PCCT demonstrated high accuracy in estimating bone strength compared to HR-pQCT.

Conclusions:

• PCCT is a viable and accurate method for quantifying bone strength, comparable to HR-pQCT.
• The findings support PCCT's potential for improved clinical assessment of fracture risk in osteoporosis.
• PCCT's larger field of view may allow for broader applications beyond peripheral skeletal sites.