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Journal of Electronic Imaging

Selecting a threshold for two-dimensional echocardiograms
Author(s): Shriram V. Revankar; David B. Sher; Chris Cheung
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Paper Abstract

Thresholding has been extensively used to separate myocardium from two-dimensional echocardiograms. We present a critical review of the existing threshold-based methods, and propose a new interactive method that uses the known average wall thickness at the indicated region to determine a reference global threshold. The thickness of the wall as seen in the thresholded image is important for quantization of cardiac parameters such as ventricular volume, ejection fraction, etc. In echocardiograms, owing to the characteristics of the imaging environment, the cardiac wall thickness depends on the threshold. Many existing methods concentrate on extracting continuous wall regions. In our scheme we select a threshold that yields walls ofproper thickness, and then we attempt to obtain a continuous region. In our scheme, a userpicks two points on a clearly visible section of the wall where the thickness is known. We compute a threshold by analyzing the regionalhistogram at that wall section so that average thickness of the regional thresholded pattern is equal to the known wall thickness. This gives a reference threshold that is varied locally by regional three-dimensional morphology to obtain local thresholds. The thresholding scheme suppresses noise and generates smooth boundaries.

Paper Details

Date Published: 1 October 1992
PDF: 9 pages
J. Electron. Imag. 1(4) doi: 10.1117/12.61116
Published in: Journal of Electronic Imaging Volume 1, Issue 4
Show Author Affiliations
Shriram V. Revankar, SUNY/Buffalo (United States)
David B. Sher, SUNY/Buffalo (United States)
Chris Cheung, SUNY (United States)

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