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Interobserver-variability of lung nodule volumetry considering different segmentation algorithms and observer
H Bolte1, T Jahnke, F K W Schäfer
1Department of Diagnostic Radiology, University Hospital Schleswig-Holstein Campus Kiel, Arnold-Heller Strasse 9, 24105 Kiel, Germany. hendrikbolte@rad.uni-kiel.de
European Journal of Radiology
|April 17, 2007
Summary
Volumetry measurements for pulmonary nodules show less variability between observers than diameter measurements. Advanced volumetry algorithms reduce the impact of observer experience on results.
Area of Science:
- Radiology
- Medical Imaging
- Pulmonary Nodule Analysis
Background:
- Accurate measurement of pulmonary nodules is crucial for diagnosis and treatment.
- Interobserver variability in nodule measurements can affect clinical decisions.
Purpose of the Study:
- To assess interobserver variability in CT-based diameter and volumetric measurements of artificial pulmonary nodules.
- To compare different measurement methods, observer experience, and training levels.
Main Methods:
- 46 artificial solid nodules were examined using multislice-spiral CT in an ex-vivo chest phantom.
- Two observer groups (0 and >5 years experience) used digital calipers and two volumetry software packages.
- Measurements were performed in semi-automatic and manually corrected modes; variation coefficient (VC) was calculated.
Main Results:
- Robust volumetry demonstrated the lowest interobserver variability (VC <0.01%).
- Diameter measurements showed significant differences between experienced and inexperienced observers (p=0.023).
- A training effect was noted for diameter and semi-automatic volumetry in inexperienced observers.
Conclusions:
- Volumetry significantly reduces interobserver variance compared to diameter measurements.
- Advanced volumetry algorithms are independent of observer experience, improving consistency.
