Vertebral bone attenuation on low-dose chest CT: quantitative volumetric analysis for bone fragility assessment

Area of Science:

• Radiology
• Orthopedics
• Geriatrics

Background:

• Osteoporosis is a widespread, often undiagnosed condition that elevates fracture risk.
• Early detection of bone fragility is crucial for fracture prevention.

Purpose of the Study:

• To evaluate the effectiveness of vertebral attenuation measurements from low-dose chest computed tomography (LDCT) in assessing bone fragility.
• To compare LDCT-derived vertebral attenuation with dual-energy x-ray absorptiometry (DXA) for diagnosing osteoporosis and fractures.

Main Methods:

• 232 subjects (78 men, 154 women, >50 years) with concurrent LDCT and DXA scans were analyzed.
• Volumetric analysis of vertebral bone attenuation (Hounsfield units) from LDCT was correlated with DXA-measured bone mineral density (BMD).
• Diagnostic performance of LDCT for osteoporosis, low BMD, and compression fractures was assessed using DXA as the reference standard.

Main Results:

• LDCT-measured average vertebral attenuation strongly correlated with lumbar spine BMD (r=0.726, p<0.05).
• LDCT demonstrated high diagnostic performance for detecting compression fractures (AUC=0.827), osteoporosis, and low BMD.
• A threshold of 129.5 HU on LDCT achieved 90.9% sensitivity and 64.4% specificity for fractures.

Conclusions:

• LDCT-based volumetric assessment of vertebral bone attenuation is a feasible method for evaluating bone fragility.
• LDCT provides comprehensive bone health information, correlating well with DXA and effectively identifying osteoporosis and fractures.