Volumetric lung nodule segmentation in thoracic CT scan using freehand sketch. Issue 14 (14th October 2020)

• Record Type: Journal Article
• Authors: Pramod Kumar, S.; Latte, Mrityunjaya V.; Siri, Sangeeta K.
• Is Part Of: IET image processing. Volume 14:Issue 14(2020)
• Page Start: 3456
• Page End: 3462
• Publication Date: 2020-10-14
• Subjects: medical image processing -- diagnostic radiography -- image segmentation -- image reconstruction -- surface fitting -- lung -- cancer -- computerised tomography -- surface reconstruction; volumetric lung nodule segmentation -- thoracic CT scan -- novel computerised scheme -- segment pulmonary nodules -- texture -- mass centre -- freehand sketch analysis -- nodule volumetric extraction -- geometric modelling surface reconstruction -- implicit surface reconstruction -- volumetric analysis -- local implicit surface -- freehand sketching approach -- pulmonary nodule -- volumetric nodule segmentation performs -- size 1.7 mm -- time 1.4 s; Image processing -- Periodicals; 621.36705
• DOI: 10.1049/iet-ipr.2020.0671
• Languages: English
• ISSNs: 1751-9659

Abstract

Abstract : The authors presented a novel computerised scheme to segment pulmonary nodules using freehand sketch. Here, freehand sketching is considered to identify the location of a nodule and it serves as a natural way and also it provides inferring adaptive information i.e. size, density, texture and mass centre etc. The proposed scheme includes two phases. In first phase using the freehand sketch analysis the multi seed points to select RoI. In the second phase nodule volumetric extraction is done using geometric modelling and implicit surface reconstruction for volumetric analysis. Spherical bins are used for ray triangle intersections and then local implicit surface fitting and blending method for surface reconstruction and depiction. The performance of the proposed scheme is assessed by accuracy and consistency using 112 CT examinations from LIDC. The IoU and ASD were used to assess the discrepancy between proposed method and inter observer agreement in the proposed approach. In estimating the reproducibility, the discrepancy in proposed scheme and the manual contouring by the expert is observed to be on an average of 0.13 ± 0.07 mm and 3.04 ± 1.7 mm respectively. The experiment shows that, the proposed scheme performs reasonably well and demonstrate merit of freehand sketch.