Title :
An instrument for measuring the absolute output acoustic intensity, effective radiating area and beam non-uniformity ratio of medical ultrasound devices
Author :
Twomey, J.R. ; Nelson, C.E.
Author_Institution :
Nelson-Twomey Res. Inc., Seattle, WA, USA
Abstract :
A computer-controlled acoustic intensity measuring system (AIMS) for measuring the acoustic output of commercially manufactured diagnostic and therapeutic ultrasound devices is described. The hardware and software performance criteria and design tradeoffs resulting from experience with biomedical sound fields are also presented. The system allows three-orthogonal-axis (X, Y, and Z) position translation of up to 10 in by 10 in by 20 in with a 6.5-μm minimum step size, and is capable of waveform acquisition with a 50-MHz analog bandwidth and a maximum equivalent time sample rate of 5 GHz. The instrument can perform planar scans wherein the scan plane contains the acoustic beam axis, and two polar axes of position rotation can be added to the main positioner assembly at a later date
Keywords :
biomedical equipment; biomedical measurement; biomedical ultrasonics; ultrasonic equipment; ultrasonic measurement; 10 in; 20 in; 5 GHz; 50 MHz; 6.5 micron; absolute output acoustic intensity; acoustic beam axis; beam nonuniformity ratio; design tradeoffs; effective radiating area; hardware performance criteria; medical instrument; medical ultrasound devices; polar axes; software performance criteria; three-orthogonal-axis position translation; waveform acquisition; Acoustic devices; Acoustic measurements; Biomedical acoustics; Biomedical computing; Biomedical measurements; Computer aided manufacturing; Hardware; Instruments; Ultrasonic imaging; Ultrasonic variables measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.96286
