Noninvasive aspiration detection using through-transmission ultrasound. - Yosuke Hara; Yukio Katori; Shigeaki Okumura; Hirofumi Taki; Hiroki Umeda; Tatsuya Uechi; Fumihiko Kawamura; Yoichi Haga; Ryoichi Nagatomi; Shin-Ichi Izumi (HealthCom, 2018)