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題 名 | 超音波流速訊號處理單元開發及時域與相域流速量測技術研究=The Development of an Ultrasound Flow Velocity Signal Processing Unit and Studies in the Flow Velocity Measurements Using Time and Phase Domain Techniques |
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作 者 | 李博文; 李柏磊; 潘同泰; 江惠華; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 21:1 2001.03[民90.03] |
頁 次 | 頁15-22 |
分類號 | 410.1644 |
關鍵詞 | 超音波; 流速; 自相關; 互相關; Ultrasound; Flow velocity; Autocorrelation; Cross-correlation; |
語 文 | 中文(Chinese) |
中文摘要 | 目前臨床超音波診斷儀只可取得影像輸出訊號,因而限制RF訊號擷取與訊號處理的能力。我們建立一脈衝式超音波流速訊號處理單元,包括:中心頻率產生器、脈衝重複頻率產生器、回波訊號解調、取樣深度設定(Gating)等硬體電路,以及頻域、相域及時域超音波流速計算分析技術。計算架構包括:FFT都卜勒頻譜分析,自相關(Autocorrelation)相位移(Phase shift)及互相關(Cross correlation)時間偏移(Time shift)分析等訊號處理技術。並實際利用RF及Baseband Doppler訊號,進行超音波流速訊號計算驗證。 |
英文摘要 | Clinical ultrasonic systems provide only video output signals which limit the data acquisition and signal processing capability from current systems. The purpose of this study is to develop a pulsed Doppler ultrasound signal processing unit. The architecture of this system include: central frequency generator, PRF generator, echo signal demodulator, and sample volume setting circuit. The computation architecture included FFT Doppler spectrum, autocorrelation phase shift and cross-correlation time shift analysis. The acquired RF and baseband signals were used for calculations of FFT, autocorrelation, and cross-correlation to verify the flow velocity measurements. |
本系統中英文摘要資訊取自各篇刊載內容。