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Identifier 000447242
Title GUDU: Geometrically-constrained Ultrasound Data augmentation in U-Net for echocardiography semantic segmentation
Alternative Title GUDU: γεωμετρικά προσδιορισμένη αύξηση δεδομένων για την σημασιολογική τμηματοποίηση εικόνων υπερήχου καρδιάς με χρήση συνελικτικών νευρωνικών δικτύων
Author Σφακιανάκης, Χριστόφορος Γ.
Thesis advisor Τζιρίτας, Γεώργιος
Reviewer Αργυρός, Αντώνιος
Κομοντάκης, Νικόλαος
Abstract Echocardiography is a very important medical examination that helps in the computation of critical heart functions. Boundary identification, segmentation and estimation of the volume of key parts of the heart, especially the left ventricle, is an important but difficult and time-consuming process, even for the most experienced cardiologists, due to shadows and speckle noise that characterize ultrasound images. In recent years, research has focused on the automatic segmentation of heart through artificial intelligence techniques and especially with the use of deep learning. Our work is part of this research framework. We implemented a neural network based on U-Net and trained it, using a large public dataset of cardiac ultrasound images (CAMUS dataset), to extract the areas of the left ventricle, myocardium and left atrium. In order to optimize the training process, we have developed a data augmentation method based on the medical practice in echocardiography. The evaluation of our method by the independent platform of the public competition CAMUS, showed an overall improvement in the segmentation accuracy but also in the estimation of the volume and the ejection fraction of the left ventricle. Specifically using the metric Dice for geometric metrics, the performance of our method for the epicardium reached 0.956 for the end-diastolic phase and 0.950 for the end-systolic phase. For the clinical metrics of the left ventricle volume, the Pearson correlation coefficient was used where our method gave 0.973, 0.974, 0.871 for the end-diastolic, end-systolic phase and ejection fraction respectively.
Language English
Subject Deep learning
Image segmentation
Medical imaging
Ιατρική απεικόνιση
Νευρωνικά δίκτυα
Issue date 2022-07-29
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work
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