Andrew J. Winkler
Dept. of Phys., Univ. of Vermont, Burlington, VT 05405
The accuracy of volume flow measurements using Doppler ultrasound was tested on a calibrated volume flow phantom for several commercial systems (ATL Ultramark4 and Ultramark9, Hewlett-Packard Sonos 1000, Quantum Quad1 and Acuson 128). The phantom consists of a plastic tubing (inner diameter: 0.64 cm) running through a rectangular plastic container filled with gelatin-based tissue-mimicking material. Solutions of glycerol, water, and cellulose powder mixture, whose viscosity was 5 cp at 25 (degrees)C, were circulated through the tubing with a variable speed roller pump. The preliminary results showed that the volume flow measured by the above-mentioned commercial systems were overestimated by 25%--50%.