Title :
Intraluminal Doppler-sonography: a new device for data analysis and its in vitro test
Author :
Roth, T. ; Brennecke, R. ; Erbel, R. ; Meyer, J. ; van Seelen, W.
Author_Institution :
Johannes Gutenberg Univ., Mainz, Germany
Abstract :
Summary form only given. A special data acquisition unit has been developed which allows to process on-line not only the mean-phasic Doppler shift signal but also to analyze the spectral contents and the received A-mode signal. The probe consists of a 3f-catheter which is activated by a pulsed transmitter-receiver (Millar). The carrier frequency is 20 MHz and the impulse repetition rate is 62.5 kHz. Two modular A/D converters are used. One digitizes directly the Doppler shift frequencies in the range less than 20 kHz (sampling rate 100 kHz, resolution 12 bit); the other digitizes the RF-signal (sampling rate 200 MHz, resolution 8 bit). For further processing, data are transferred via separate bus systems to an IBM/AT compatible personal computer. An in vitro model has been developed to test the dependence of received signals on stenoses and different flow vehicles
Keywords :
Doppler effect; biomedical equipment; biomedical ultrasonics; data acquisition; spectral analysis; ultrasonic equipment; 100 kHz; 20 MHz; 200 MHz; 3f-catheter; 62.5 kHz; IBM/AT compatible personal computer; Millar; carrier frequency; data acquisition unit; data analysis; impulse repetition rate; in vitro test; intraluminal Doppler-sonography; mean-phasic Doppler shift signal; modular A/D converters; on-line processing; pulsed transmitter-receiver; received A-mode signal; spectral components analysis; stenoses; Data acquisition; Data analysis; Doppler shift; Frequency; Probes; Signal analysis; Signal processing; Signal resolution; Signal sampling; Spectral analysis;
Conference_Titel :
Computers in Cardiology 1990, Proceedings.
Conference_Location :
Chicago, IL
Print_ISBN :
0-8186-2225-3
DOI :
10.1109/CIC.1990.144288
