Constrained Delaunay triangulation for diagnosis and grading of colon cancer

buir.advisorDemir, Çiğdem Gündüz
dc.contributor.authorErdoğan, Süleyman Tuncer
dc.date.accessioned2016-01-08T18:18:35Z
dc.date.available2016-01-08T18:18:35Z
dc.date.issued2009
dc.descriptionAnkara : The Department of Computer Engineering and the Institute of Engineering and Science of Bilkent University, 2009.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2009.en_US
dc.descriptionIncludes bibliographical references leaves 93-107.en_US
dc.description.abstractIn our century, the increasing rate of cancer incidents makes it inevitable to employ computerized tools that aim to help pathologists more accurately diagnose and grade cancerous tissues. These mathematical tools offer more stable and objective frameworks, which cause a reduced rate of intra- and inter-observer variability. There has been a large set of studies on the subject of automated cancer diagnosis/grading, especially based on textural and/or structural tissue analysis. Although the previous structural approaches show promising results for different types of tissues, they are still unable to make use of the potential information that is provided by tissue components rather than cell nuclei. However, this additional information is one of the major information sources for the tissue types with differentiated components including luminal regions being useful to describe glands in a colon tissue. This thesis introduces a novel structural approach, a new type of constrained Delaunay triangulation, for the utilization of non-nuclei tissue components. This structural approach first defines two sets of nodes on cell nuclei and luminal regions. It then constructs a constrained Delaunay triangulation on the nucleus nodes with the lumen nodes forming its constraints. Finally, it classifies the tissue samples using the features extracted from this newly introduced constrained Delaunay triangulation. Working with 213 colon tissues taken from 58 patients, our experiments demonstrate that the constrained Delaunay triangulation approach leads to higher accuracies of 87.83 percent and 85.71 percent for the training and test sets, respectively. The experiments also show that the introduction of this new structural representation, which allows definition of new features, provides a more robust graph-based methodology for the examination of cancerous tissues and better performance than its predecessors.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T18:18:35Z (GMT). No. of bitstreams: 1 0006184.pdf: 3102511 bytes, checksum: da17652b930a6e0b7d135c951b203db6 (MD5)en
dc.description.statementofresponsibilityErdoğan, Süleyman Tunceren_US
dc.format.extentxvii, 108 leaves, illustrationsen_US
dc.identifier.itemidBILKUTUPB117113
dc.identifier.urihttp://hdl.handle.net/11693/15446
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectConstrained Delaunay Triangulationen_US
dc.subjectHistopathological image analysisen_US
dc.subjectAutomated cancer diagnosis and gradingen_US
dc.subjectColon canceren_US
dc.subjectAdenocarcinomaen_US
dc.subject.lccWI529 .E73 2009en_US
dc.subject.lcshColon (Anatomy)--Cancer--Histopathology.en_US
dc.subject.lcshColon (Anatomy)--Cancer--Diagnosis.en_US
dc.subject.lcshImage processing--Digital techniques.en_US
dc.subject.lcshTriangulation.en_US
dc.titleConstrained Delaunay triangulation for diagnosis and grading of colon canceren_US
dc.typeThesisen_US
thesis.degree.disciplineComputer Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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