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Long-term in vitro precision of single slice peripheral Quantitative Computed Tomography (pQCT): multicenter
G Guglielmi1, M Cammisa, A De Serio
1Department of Radiology, Scientific Institute Hospital Casa Sollievo della Sofferenza, San Giovanni Rotondo, FG, Italy.
Summary
Single slice peripheral Quantitative Computed Tomography (pQCT) systems demonstrate excellent precision and stability for bone density measurements. These findings suggest reliable performance for clinical applications in healthcare systems.
Area of Science:
- Medical Imaging
- Bone Densitometry
- Radiological Physics
Background:
- Peripheral Quantitative Computed Tomography (pQCT) is utilized in healthcare systems, particularly in Italy.
- Assessing the precision and stability of pQCT devices is crucial for reliable bone mineral density measurements.
Purpose of the Study:
- To evaluate the precision and stability of single slice peripheral Quantitative Computed Tomography (pQCT) systems.
- To determine if system performance impacts in vivo measurements.
Main Methods:
- A multicenter evaluation involving four pQCT scanners over two years.
- Frequent phantom measurements using automated software to assess intrasite and intersite mineral densities.
- Analysis of root mean square error and coefficient of variation (% CV) for precision estimation.
Main Results:
- Short-term precision was consistently good, with a mean intrasite coefficient of variation (CV) of 0.21% ± 0.056 SD.
- Intersite differences between machines were minimal (≤ 2.9 mg/cm³).
- Frequent phantom measurements showed a mean CV of 0.18% across sites, with no significant machine drift observed over time.
Conclusions:
- Single slice pQCT systems exhibit high in vitro precision and stability.
- The performance of these systems is unlikely to negatively impact in vivo precision for bone mineral density assessment.