ISSN:
1741-0444
Keywords:
Blood velocity measurements
;
Frequency analysis
;
Microprocessors
;
Ultrasound
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract A signal processor has been designed using bit-slice microprocessor techniques. The processor has two data bases for input/output, a central processing unit and a memory. The microprogram in the processor can be changed to suit individual needs. The analysis which is performed at present is a fast Fourier transform (FFT) of ultrasonic blood-velocity signals with graphic display of the results. The FFT operates on 256 sampled points, thus giving 128 frequency components of the signal. Each transform is calculated in less than 4·5 ms. The algorithm of the FFT uses base 2, and the real-valued signal is transformed into a complex sequence to simplify the program. The microprocessor has been interfaced to an ultrasound doppler blood-velocity meter. Results from measurements on arteries are shown.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02442520
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