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CT-based virtual tracheobronchoscopy in children--comparison with axial CT and multiplanar reconstruction:
Erich Sorantin1, Bernhard Geiger, Franz Lindbichler
1Division of Paediatric Radiology, Department of Radiology, University Hospital Graz, Auenbruggerplatz 34, 8036 Graz, Austria. erich.sorantin@kfunigraz.ac.at
Background:
3D post-processing of spiral-CT (S-CT) data using perspective projection allows the generation of virtual views similar to endoscopy.
Objective:
To evaluate whether simultaneous reading of axial S-CT, multiplanar reconstruction (MPR) and virtual tracheobronchoscopy (VTB) is more precise and accurate than reading of axial S-CT and MPR alone in paediatric patients.
Materials And Methods:
S-CT studies of 15 symptomatic and 4 normal patients were investigated. Two radiologists independently read two sets of images for airway abnormalities: first axial CT and MPR, followed by axial CT, MPR and VTB. A final decision was later made by consensus. All results were compared to fibre-optic bronchoscopy (FTB). Interobserver agreement was used as an indicator of precision for the display technique used.
Results:
At reading of axial S-CT and MPR an interobserver agreement of 89.5% (kappa=0.776, P<0.00103) was found. Based on the consensus decision, a diagnostic accuracy of 89.5% at a sensitivity 86.6% and specificity of 100% (kappa=0.776, 95% CI 0.491-1.062, P<0.00103) was achieved. At reporting on axial S-CT, MPR and VTB, all cases were classified correctly by both readers, indicating 100% accuracy, interobserver agreement, sensitivity and specificity (kappa=1.00, 95% CI 1.0-1.0, P<0.000258).
Conclusions:
The simultaneous display of axial S-CT, MPR and VTB raises the precision, accuracy and sensitivity of radiological reports.
