Segmentation of pulmonary nodules in thoracic CT scans: a region growing approach

Dehmeshki, Jamshid and Amin, Hamdan and Valdivieso, Manlio and Ye, Xujiong (2008) Segmentation of pulmonary nodules in thoracic CT scans: a region growing approach. IEEE transactions on medical imaging, 27 (4). pp. 467-480. ISSN 0278-0062

Full content URL: http://dx.doi.org/10.1109/TMI.2007.907555

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Abstract

This paper presents an efficient algorithm for segmenting different types of pulmonary nodules including high and
low contrast nodules, nodules with vasculature attachment, and nodules in the close vicinity of the lung wall or diaphragm. The algorithm performs an adaptive sphericity oriented contrast region growing on the fuzzy connectivity map of the object of interest. This region growing is operated within a volumetric mask which is created by first applying a local adaptive segmentation algorithm that identifies foreground and background regions within a certain window size. The foreground objects are then filled to remove any holes, and a spatial connectivity map is generated to create a 3-D mask. The mask is then enlarged to contain the background while excluding unwanted foreground regions. Apart from generating a confined search volume, the mask is also used to estimate the parameters for the subsequent region growing, as well as for repositioning the seed point in order to ensure reproducibility. The method was run on 815 pulmonary nodules. By using randomly placed seed points, the approach was shown to be fully reproducible. As for acceptability, the segmentation results were visually inspected by a qualified radiologist to search for any gross misssegmentation. 84% of the first results of the segmentation were accepted by the radiologist while for the remaining 16% nodules, alternative segmentation solutions that were provided by the method were selected.

Keywords:Fuzzy connectivity, local adaptive segmentation, nodule segmentation, region growing
Subjects:G Mathematical and Computer Sciences > G400 Computer Science
Divisions:College of Science > School of Computer Science
ID Code:7251
Deposited On:16 Jan 2013 16:05

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