Title :
An implantable multichannel ultrasonic pulsed Doppler blood flowmeter
Author :
Yeung, King-Wah W. ; Sebek, James J. ; Meindl, James D.
Author_Institution :
Integrated Circuits Lab., Stanford Univ., CA, USA
Abstract :
An optimal architecture for an implantable multichannel ultrasonic pulsed Doppler blood flowmeter, based on power consumption, implant volume, channel isolation, and signal processing, is presented. The theoretical limits are determined by studying the effects of the system variables on the range of measurable blood velocities. A real-time discrete Fourier transform frequency estimator is implemented in the multichannel flowmeter to facilitate faster and more accurate frequency estimates than those obtained by the conventional zero-crossing counter. The design of a prototype three-channel flowmeter is introduced, and the feasibility of simultaneous multichannel flow measurements is demonstrated
Keywords :
Doppler effect; biomedical equipment; biomedical ultrasonics; flowmeters; haemodynamics; ultrasonic equipment; 3-channel flowmeter; channel isolation; implant volume; implantable multichannel ultrasonic pulsed Doppler blood flowmeter; medical ultrasonic instrument; power consumption; real-time discrete Fourier transform frequency estimator; signal processing; system variables; zero-crossing counter; Blood; Counting circuits; Discrete Fourier transforms; Energy consumption; Frequency estimation; Implants; Prototypes; Signal processing; Ultrasonic variables measurement; Velocity 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.1989.95577
