title: [Current scanning and biometry equipment in ophthalmologic ultrasound diagnosis].
abstract: The development of ophthalmological sonographic equipment started as early as 1958 with the ultrasonic "slit lamp" of Baum and Greenwood. This was an immersion-type device with a closed membrane. Subsequent developments took place mainly after the introduction of the contact B-scanner by Bronson and Turner approximately 10 years ago. The instrument designed by them still serves as a source of inspiration for the creation of many "small-part" scanners. Among the special display modes featured in ophthalmological equipment, we have the deflection-modulated B-image (AB-mode) and the so-called "continuous-vector" mode for the A-trace selection from a real time B-mode image. Other examples are the specially designed A-mode equipment for measurement of the axial length of the human eye, and the A-mode equipment with a more or less standardized-gain characteristic curve of the overall amplification.
authors.affiliation: Biophysikalisches Laboratorium, Universitätsabteilung für Ophthalmologie, Katholische Universität Nijmegen, Holland.
authors.forename: J M
authors.initials: JM
authors.lastname: Thijssen
mesh_terms: D000886:Anthropometry / Q000295:instrumentation*; D004867:Equipment Design; D005123:Eye / Q000000981:diagnostic imaging*; D005128:Eye Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D014463:Ultrasonography / Q000295:instrumentation*