Correlation between vertebral bone mineral density and multi-level virtual non-calcium imaging parameters from...

Area of Science:

• Radiology
• Medical Imaging
• Bone Densitometry

Background:

• Virtual non-calcium (VNCa) imaging using dual-energy computed tomography (CT) is valuable for diagnosing spinal diseases.
• Current VNCa technology has limitations in measuring vertebral bone mineral density (BMD), particularly concerning VNCa CT values at various calcium suppression levels and VNCa curve slopes.

Purpose of the Study:

• To investigate the correlation between vertebral BMD and novel VNCa parameters obtained from dual-layer spectral detector CT.
• To evaluate the utility of VNCa imaging in assessing vertebral BMD.

Main Methods:

• Retrospective analysis of dual-layer spectral detector CT and quantitative CT (QCT) data from 667 vertebrae and 4 hydroxyapatite inserts in 234 patients.
• Measurement of BMD using QCT (QCT-BMD) for vertebrae (T12, L1, L2) and inserts.
• Recording of VNCa CT values and VNCa attenuation curve slopes (λ) for vertebrae and inserts.
• Analysis of correlations between VNCa parameters (VNCa CT value, slope λ) and QCT-BMD.

Main Results:

• Vertebral VNCa parameters showed significant correlations with QCT-BMD (correlation coefficients ranging from -0.904 to 0.712, P<0.05).
• The strongest correlation for vertebrae was observed at a calcium suppression index of 25% (r=-0.904, P<0.001).
• Slopes (λ1, λ2, λ3) derived from the VNCa attenuation curve demonstrated high correlations with QCT-BMD for vertebrae (all r=0.956, P<0.05) and inserts (all r≥0.996, P<0.05).

Conclusions:

• A strong correlation exists between VNCa CT parameters and QCT-BMD in vertebrae.
• These findings suggest that VNCa imaging holds potential for assessing vertebral BMD, meriting further research.