八木 登志員, 吉川 純一, 吉田 清, 赤阪 隆史, 赤土 正洋, 穂積 健之, 三宅 仁, 大倉 宏之, 本多 康浩

Toshikazu YAGI, Junichi YOSHIKAWA, Kiyoshi YOSHIDA, Takashi AKASAKA, Masahiro SHAKUDO, Takeshi HOZUMI, Shinobu MlYAKE, Hiroyuki OKURA, Yasuhiro HONDA

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, Region of interest, Mitral annulus, Left ventricular area, Left ventricular volume

A recently developed acoustic quantification (AQ) method permits real time automated boundary detection with on-line cavity area and volume measurements throughout the cardiac cycle. To assess the effects of a region of interest (ROI) on the evaluation of left ventricular area (LVA), fractional area change (FAC), left ventricular volume (LVV) and ejection fraction (EF), we examined 30 patients using the AQ method. A trackball-derived ROI-1 was drawn around the mitral annulus at end-diastole. A trackball-derived ROI-2 was drawn around the mitral annulus at end-systole. On-line AQ LVA and LVV calculated from ROI-1 were larger than those calculated from ROI-2 (left ventricular end-diastolic area: 27±6 cm² (ROI-1, apical 4-chamber view (A 4-CV)) vs 24±6 cm² (ROI-2, A 4-CV), p2 (ROI-1, A 4-CV) vs 15±6 cm² (ROI-2, A 4-CV), p