Photon-counting detector CT virtual monoenergetic imaging for bone mineral density quantification: Validation with Micro-CT
Yuanbo Ma, Yaman Li, Danyang Su, Yufang Du, Ke Qi, Simeng Wang, Hao Shen, Mengze Ma, Fei Li, Shenyu Yang, Qiuju Miao, Xiaopeng Yang
TL;DR
Photon-counting CT can accurately measure bone density in rabbits, matching micro-CT standards and offering potential for clinical use.
Contribution
Demonstrates a phantom-free, reproducible method for bone mineral density quantification using PCD-CT virtual monoenergetic imaging.
Findings
VMI-derived CT values strongly correlate with micro-CT-measured vBMD (r > 0.925).
50 keV VMI shows highest correlation (r = 0.951) and best model fit (R2 = 0.9138).
60–80 keV energy range balances predictive accuracy and image quality.
Abstract
Volumetric bone mineral density (vBMD) is crucial for evaluating bone quality. We established rabbit tibial defect models to assess virtual monoenergetic imaging (VMI) based on photon-counting detector CT (PCD-CT) for vBMD quantification, using micro-CT as the reference standard. VMI-derived CT values strongly correlated with micro-CT–measured vBMD across all energies (r > 0.925). The 50 keV VMI achieved the highest correlation with micro-CT (r = 0.951) and the best model fit (R2 = 0.9138), with low prediction errors (MAE = 0.0114 g/cm3; RMSE = 0.0135 g/cm3). In terms of image quality, the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were superior at 70 keV. Overall, the energy range of 60–80 keV provided the optimal balance between predictive accuracy and image quality. PCD-CT is poised to play a transformative role in orthopedic research and clinical bone health…
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Taxonomy
TopicsAdvanced X-ray and CT Imaging · Medical Imaging Techniques and Applications · Dental Radiography and Imaging