TY - JOUR
AU1 - Brandestini, M.
AB -  M. Brandestini Institut für Biomedizinische Technik der Universität und der Zürich, Schweiz 1. INTRODUCTION Doppier Ultrasonics are nowadays a widely spread diagnostic tool for studying blood flow and vessel topography. The most elaborate Instruments use a pulsed source and divide the received Signal into a number of parallel channels to record spatial velocity profiles [l],[2]. In a next step, evaluation of volume flow äs a major diagnostic index can be effectuated [3]. However these Systems suffer from several handicaps: Manual controls are inevitable to locate the observed vessel. The many parallel channels want to be perfectly tuned, and after all, the System grows to a bulky apparatus with a multiplicity of identical circuits. The phasedetection method, proposed by Grandchamp and Brandestini [4],[5] promised to overcome these drawbacks by using sequential data processing. Until now no "in vivo" results could be obtained with this principle, therefore a new digital System was evaluated and realized. The novel Instrument appeals by simple hardware, easy operating, a variety of display modes and good results "in vitro" and "in vivo". THE A/D CONVERTER AND SATIONARY CANCELER According to figure 1. the flowmeter is identical to the classical implementations äs far äs the RF 
TI - A DIGITAL 128-CHANNEL TRANSCUTANEOUS BLOOD-FLOWMETER
JF - Biomedizinische Technik / Biomedical Engineering
DO - 10.1515/bmte.1976.21.s1.291
DA - 1976-01-01
UR - https://www.deepdyve.com/lp/de-gruyter/a-digital-128-channel-transcutaneous-blood-flowmeter-hMJOzvcmzy
SP - 291
EP - 292
VL - 21
IS - s1
DP - DeepDyve
ER -