Lung graph-model classiffication with SVM and CNN for tuberculosis severity assessment and automatic CT report generation : participation in the ImageCLEF 2019 Tuberculosis Task

Diecente Cid, Yashin (University of Applied Sciences and Arts Western Switzerland (HES-SO Valais-Wallis) ; Müller, Henning (University of Applied Sciences and Arts Western Switzerland (HES-SO Valais-Wallis; University of Geneva, Switzerland)

In 2019, ImageCLEF proposed a task using CT (Computed Tomography) scans of patients with tuberculosis (TB). The task was divided into two subtasks: TB severity assessment (SVR subtask) and automatic CT report generation (CTR subtask). In this work we present our participation in the task. We participated with a graph model of the lungs with a morphology{based structure that was previously validated for the detection of TB types. The graph is based on a parcellation of the lung elds into supervoxels, where each region is identied as a node of the graph. A weighted edge is dened between nodes representing adjacent regions. The associated weight is computed as the distance between 3D texture descriptors extracted from the two connected regions. This model encodes the texture distribution along the lungs, making it suitable for detecting the tissue abnormalities present in TB patients. In this work we explore two techniques to classify these graphs: (i) a lung descriptor vector based on the aggregation of graph centrality measures and (ii) a set of 2D histograms encoding the binary distribution of node features. The nal classication is performed with support vector machines for the lung descriptor vector and with convolutional neural networks for the 2D histograms. The results show the strength of the technique, leading to 6th and 3rd place in the SVR and CTR subtasks, respectively.


Keywords:
Conference Type:
full paper
Faculty:
Economie et Services
School:
HEG-VS
Institute:
Institut Informatique de gestion
Subject(s):
Informatique
Publisher:
Lugano, Switzerland, 9-12 September 2019
Date:
2019-09
Lugano, Switzerland
9-12 September 2019
Pagination:
10 p.
Published in:
Proceedings of CLEF (Conference and Labs of the Evaluation Forum) 2019 Working Notes
External resources:
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 Record created 2019-10-25, last modified 2019-11-28

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