Key result
Independent segmentation of the endocardium followed by an epicardial segmentation coupled to the endocardium was the most advantageous strategy for 3-D myocardial segmentation.
A novel coupling strategy for fully automatic 3-D myocardial segmentation in echocardiography improves upon uncoupled methods.
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Coupled segmentation merits testing in clinical 3D echo workflows; leaves open whether it improves accuracy over uncoupled methods.
Cardiac volume/function assessment remains a critical step in daily cardiology, and 3-D ultrasound plays an increasingly important role. Though development of automatic endocardial segmentation methods has received much attention, the same cannot be said about epicardial segmentation, in spite of the importance of full myocardial segmentation. In this paper, different ways of coupling the endocardial and epicardial segmentations are contrasted and compared with uncoupled segmentation. For this purpose, the B-spline explicit active surfaces framework was used; 27 3-D echocardiographic images were used to validate the different coupling strategies, which were compared with manual contouring of the endocardial and epicardial borders performed by an expert. It is shown that an independent segmentation of the endocardium followed by an epicardial segmentation coupled to the endocardium is the most advantageous. In this way, a framework for fully automatic 3-D myocardial segmentation is proposed using a novel coupling strategy.
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Pedrosa et al. (2016) studied this question. Coupled endocardial and epicardial segmentation vs. Uncoupled segmentation and manual contouring was evaluated on Segmentation accuracy. Independent segmentation of the endocardium followed by an epicardial segmentation coupled to the endocardium was the most advantageous strategy for 3-D myocardial segmentation.
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