Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 1988.07a
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- Pages.709-712
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- 1988
A study on the development of CW(Continuous-Wave) Doppler System using FFT
FFT를 이용한 연속초음파 도플러 장치에 관한 연구
- Lee, Dae-Hyung (Dept. of Electronic Eng. A-jou University) ;
- Kang, Chung-Shin (Dept. of Electronic Eng. A-jou University) ;
- Park, Sei-Hyun (Dept. of Electronic Eng. A-jou University) ;
- Kim, Young-Kil (Dept. of Electronic Eng. A-jou University)
- Published : 1988.07.01
Abstract
Ultrasonic Doppler Diagnostic System utilizes the Doppler effect for measurement of blood velocity. The sign of the Doppler frequency shift represents blood flow direction. CW(Continuous-Wave) Doppler System uses quadrature detection and phase rotation method to produce simultaneous independent audio and velocity signals for forward and reverse blood flow direction in the time-domain, had been fabricated. But time-domain analyzing such as audio evaluation and zero- crossing detection for instantaneous and mean frequnecy measurement do not provide both an accurate and quantitative result. Therefore, it is necessary to adopt frequency-domain technique to improve system performance. In this paper, we describe a unit which is composed of CW Doppler System and real-time spectrum analyzer (installed TMS 32010 DSP Chip). This unit shows time-dependent spectrum variation and mean velocity of Blood signal.
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