標準左心室形状モデルの適用による心臓内壁輪郭自動抽出法

摘要

The necessity of ultrasonic diagnosis tools increases every year. We propose an automatic endocardium tracing method by applying prepared "Standard Left Ventricles Shape Model (SLVSM)". The cross section of heart wall in ultrasonic image is decided depending on the position and the angle of this probe. The initial contour is adaptively determined as crossing curve line between the SLVSM and the cross section. And the endocardium contour is extracted by active contour model(ACM) in two stages. In the first stage, an endocardium contour is detected using the result of an edge extraction based on the separability of image features. In the second stage, the endocardium contour is extracted using shape correction processing. "Mitral valve processing" not only detects the position of the mitral valve at the end diastolic period, but also corrects the detected contour after the first stage of ACM. Experimental results using one healthy case and three diseased cases have shown the effectiveness of the proposed method.%心臓疾患の診断において，心エコー検査は心電図に並んrnで重要な検査法として臨床の場で用いられている。心エrnコー検査を用いる利点として，非侵襲で心臓の動きを動画rn像で観察することができ，かつ心機能を評価できる点が挙rnげられる。検査の際に，定期健診や手術後の経過を診断rnするために，心臓内壁の輪郭と心機能を評価する数億が記rn録されている。