八木 登志員, 吉川 純一, 吉田 清, 赤阪 隆史, 赤土 正洋, 高木 力, 三宅 仁, 大倉 宏之, 穂積 健之, 前西 文秋

Toshikazu YAGI, Junichi YOSHIKAWA, Kiyoshi YOSHIDA, Takashi AKASAKA, Masahiro SHAKUDO, Tsutomu TAKAGI, Shinobu MIYAKE, Hiroyuki OKURA, Takeshi HOZUMI, Fumiaki MAENISHI

神戸市立中央市民病院循環器内科

Department of Cardiology, Kobe General Hospital

キーワード : Acoustic quantification, Left ventricular area , Fractional area change, Edge detection

Recently, a new echocardiographic imaging system has been developed that detects and traces endocardial boundaries in real time, based on the quantitative acoustic properties of tissue and blood. Acoustic quantification (AQ: the real-time automated edge detection system) was interfaced with special software to allow on-line display of the instantaneous left ventricular (LV) cavity area (cm²) and fractional area change (%FAC). Our purpose was to compare measurements of the endocardial area that were manually traced from conventional echocardiograms with those obtained by the real-time automated edge detection system. Normal subjects were used. Although the real-time derived results were underestimated, excellent correlations were obtained for the left ventricular end-diastolic [24±4 (AQ) vs 26±4 cm² (manually)] and end-systolic areas [16±4 (AQ) vs 17±4 cm² (manually)] measured from apical four chamber view (r=0.98, p2 vs r=0.90, p2, respectively). Manually drawn FAC and real-time FAC also correlated well (r=0.99, p