title: An ultrasonic displacement instrument with greater beam dispersal.
mesh_terms: D000818:Animals; D001699:Biometry; D004285:Dogs; D004582:Electronics, Medical; D006321:Heart / Q000502:physiology; D006352:Heart Ventricles / Q000033:anatomy & histology; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation*