title: 40 years of ultrasound real-time grayscale diagnostics.
authors.forename: R
authors.initials: R
authors.lastname: Knöttner
mesh_terms: D004562:Electrocardiography; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D014463:Ultrasonography / Q000266:history* / Q000295:instrumentation / Q000639:trends