title: A maximum frequency detector for Doppler blood velocimeters.
abstract: The clinical information available from ultrasonic Doppler blood velocimeters may be analysed in several ways, spectral analysis probably being the best. This is, however, a relatively expensive technique when compared with the cost of commerically available Doppler velocimeters. A large part of the diagnostic information present can be obtained from the maximum blood velocity in the vessel at any one time. A relatively inexpensive analogue method of extracting this information from the Doppler signal is described, and the preliminary results obtained on signals derived from peripheral arteries are discussed.
mesh_terms: D001783:Blood Flow Velocity; D004301:Doppler Effect; D004581:Electronics / Q000295:instrumentation; D012212:Rheology; D014465:Ultrasonics / Q000295:instrumentation*; D014463:Ultrasonography