查詢結果分析
相關文獻
- 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
- 糖尿病患者排尿障礙之臨床研究
- Middle Cerebral Artery Blood Flow during Postural Changes in Elderly Patients with Dizziness after Hemorrhagic Stroke
- Color Doppler Ultrasound Flow Velocity Waveforms of the Umbilical and Arcuate Arteries in Normal and Gestational Diabetic Pregnancies
- The Effect of Changes in the Internal Structure of a Schooling Fish on the Estimation Efficiency by Acoustic Methods
- 非接觸型儀器野外調查之可行性研究
- Left Atrial Appendage Flow Velocity and Spontaneous Echo Contrast in Patients with Rheumatic Mitral Stenosis: A Multiplane Transesophageal Echocardiographic Study
- Portal Vein Velocity by Duplex Doppler Ultransound as an Indication of the Clinical Severity of Portal Hypertension
- The Use of Stationary Hydroacoustic Transducer to Study Diel and Seasonal Influences on the Distribution of Fish School in Water Adjacent to the Cooling Water Intake of Nuclear Power Plant III
- 穿顱超音波探討Norepinephire對血壓正常者腦部動脈血流速度之研究
頁籤選單縮合
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 |
---|---|
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. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。