Supplementary Material for: The Utility of Virtual Bronchoscopy Using a Computed Tomography Workstation for Conducting Conventional Bronchoscopy: A Retrospective Analysis of Clinical Practice

<b><i>Background:</i></b> Recent clinical trials demonstrated the benefits of several guided-bronchoscopy technologies for the diagnosis of peripheral pulmonary lesions (PPLs). However, introduction of these technologies is expensive. Therefore, in clinical practice, these are unavailable in many hospitals. In contrast, virtual bronchoscopy (VB) using the computed tomography (CT) workstation can be made available immediately without additional cost as many hospitals already have the CT scan facility. However, the effectiveness of VB alone remains to be shown. <b><i>Objectives:</i></b> The aim of this study was to investigate the effect of VB using the CT workstation in hospitals performing conventional bronchoscopy. <b><i>Methods:</i></b> Results from consecutive patients who underwent bronchoscopy for small PPLs (major diameter ≤30 mm) were retrospectively reviewed. Sixty-nine patients who underwent bronchoscopy without VB from April 2014 to March 2015 and 56 patients who underwent bronchoscopy with VB from April 2015 to December 2015 were assigned to non-VB and VB groups, respectively. We compared the two groups and analyzed the factors affecting the diagnostic yield. <b><i>Results:</i></b> The VB group had a significantly higher diagnostic yield than the non-VB group (57.1 vs. 33.3%; <i>p</i> = 0.008). In the multivariate analysis, VB was identified as a significant factor affecting the diagnostic yield (odds ratio: 3.30, <i>p</i> = 0.011). <b><i>Conclusions:</i></b> In the conventional bronchoscopy settings, VB using the CT workstation is efficient for the diagnosis of PPLs when other guided-bronchoscopy techniques are unavailable.