title: Continuous measurement of aortic radius change in vivo with an intra-aortic ultrasonic catheter.
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000033:anatomy & histology* / Q000502:physiology; D001794:Blood Pressure; D002404:Catheterization; D004285:Dogs; D004548:Elasticity; D014465:Ultrasonics