Novel context rich loco and gloco features with local and global shape constraints for segmentation of 3d echocardiograms with random forests

Authors:
Kiryl Chykeyuk;Mohammad Yaqub;J. Alison Noble
Affiliations:
Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK;Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK;Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK
Venue:
MCV'12 Proceedings of the Second international conference on Medical Computer Vision: recognition techniques and applications in medical imaging
Year:
2012

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Abstract

This work addresses the challenging problem of segmenting the myocardium in 3D LV echocardiograms by Random Forests (RF). While the RF framework has proven to be a good discriminative classifier for segmentation of 3D echocardiography [1], our hypothesis is that richer features than those traditionally used (Haar etc) need to be employed for accurate segmentation to tackle artifacts in ultrasound images such as missing anatomical boundaries. To address this, we propose two new context rich and shape invariant features, called LoCo and GloCo. The new features impose a local and global constraint on the coupled endocardial and epicardial shape of the left ventricle and use barycentric coordinates to uniquely identify the position of a voxel with respect to a number of landmarks on the epicardial and endocardial border. The landmarks are found using a new measure (COFA) to separate the two boundaries. Experimental results show that the new features provide a smoother segmentation and improve the accuracy compared with a classic RF implementation.