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Detection of pulmonary nodules in low-dose computed tomography using localized active contours and shape features

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Title: Detection of pulmonary nodules in low-dose computed tomography using localized active contours and shape features
Authors: Zahra Nadealian, Behzad Nazari, Saeid Sadri, Mohammad Momeni
Source: Journal of Medical Signals and Sensors, Vol 7, Iss 4, Pp 203-212 (2017)
Publisher Information: Wolters Kluwer Medknow Publications, 2017.
Publication Year: 2017
Collection: LCC:Medical technology
Subject Terms: Computer-aided detection, computed tomography images, feature extraction, localized active contours, pulmonary nodules, template matching, Medical technology, R855-855.5
More Details: Background: Pulmonary nodules are symptoms of lung cancer. The shape and size of these nodules are used to diagnose lung cancer in computed tomography (CT) images. In the early stages, nodules are very small, and radiologist has to refer to many CT images to diagnose the disease, causing operator mistakes. Image processing algorithms are used as an aid to detect and localize nodules. Methods: In this paper, a novel lung nodules detection scheme is proposed. First, in the preprocessing stage, our algorithm segments two lung lobes to increase processing speed and accuracy. Second, template-matching is applied to detect the suspicious nodule candidates, including both nodules and some blood vessels. Third, the suspicious nodule candidates are segmented by localized active contours. Finally, the false-positive errors produced by vessels are reduced using some two-/three-dimensional geometrical features in three steps. In these steps, the size, long and short diameters and sphericity are used to decrease the false-positive rate. Results: In the first step, some vessels that are parallel to CT cross-plane are identified. In the second step, oblique vessels are detected using shift of center of gravity in two successive slices. In step three, vessels vertical to CT cross-plane are identified. Using these steps, vessels are separated from nodules. Early Lung Cancer Action Project is used as a popular dataset in this work. Conclusions: Our algorithm achieved a sensitivity of 90.1% and a specificity of 92.8%, quite acceptable in comparison to other related works.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2228-7477
Relation: http://www.jmss.mui.ac.ir/article.asp?issn=2228-7477;year=2017;volume=7;issue=4;spage=203;epage=212;aulast=Nadealian; https://doaj.org/toc/2228-7477
DOI: 10.4103/jmss.JMSS_71_16
Access URL: https://doaj.org/article/3102a4b0bff1435c8e171def5f05e6eb
Accession Number: edsdoj.3102a4b0bff1435c8e171def5f05e6eb
Database: Directory of Open Access Journals
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  Data: Journal of Medical Signals and Sensors, Vol 7, Iss 4, Pp 203-212 (2017)
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  Data: Background: Pulmonary nodules are symptoms of lung cancer. The shape and size of these nodules are used to diagnose lung cancer in computed tomography (CT) images. In the early stages, nodules are very small, and radiologist has to refer to many CT images to diagnose the disease, causing operator mistakes. Image processing algorithms are used as an aid to detect and localize nodules. Methods: In this paper, a novel lung nodules detection scheme is proposed. First, in the preprocessing stage, our algorithm segments two lung lobes to increase processing speed and accuracy. Second, template-matching is applied to detect the suspicious nodule candidates, including both nodules and some blood vessels. Third, the suspicious nodule candidates are segmented by localized active contours. Finally, the false-positive errors produced by vessels are reduced using some two-/three-dimensional geometrical features in three steps. In these steps, the size, long and short diameters and sphericity are used to decrease the false-positive rate. Results: In the first step, some vessels that are parallel to CT cross-plane are identified. In the second step, oblique vessels are detected using shift of center of gravity in two successive slices. In step three, vessels vertical to CT cross-plane are identified. Using these steps, vessels are separated from nodules. Early Lung Cancer Action Project is used as a popular dataset in this work. Conclusions: Our algorithm achieved a sensitivity of 90.1% and a specificity of 92.8%, quite acceptable in comparison to other related works.
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