title: A knowledge-based boundary delineation system for contrast ventriculograms.
abstract: Automated left-ventricle (LV) boundary delineation from contrast ventriculograms has been studied for decades. Unfortunately, no accurate methods have ever been reported. A new knowledge based multistage method to automatically delineate the LV boundary at end diastole (ED) and end systole (ES) is discussed in this paper. It has a mean absolute boundary error or about 2 mm and an associated ejection fraction error of about 6%. The method makes extensive use of knowledge about LV shape and movement. The processing includes a multiimage pixel region classification, shape regression, and rejection classification. The method was trained and cross-validated tested on a database of 375 studies whose ED and ES boundary had been manually traced as the ground truth. The cross-validated results presented in this paper show that the accuracy is close to and slightly above the interobserver variability.
authors: Ultrasound Group, Siemens Medical System, Issaquah, WA 98029, USA.
authors: L
authors: L
authors: Sui
authors: R M
authors: RM
authors: Haralick
authors: F H
authors: FH
authors: Sheehan
mesh_terms: D001185:Artificial Intelligence; D001499:Bayes Theorem; D017023:Coronary Angiography / Q000379:methods*; D006352:Heart Ventricles / Q000473:pathology*; D006801:Humans