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Doppler Aliasing
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Doppler Aliasing
Aliasing Doppler
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Artifact
What Is Aliasing
Filter
Doppler
Spactral Aliasing
Aliasing
Ultrasound
Aliasing
in Video
Hanning Dp40b 043
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Aliasing
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2:54
Câu hỏi :"Khi nào hiện tượng aliasing xảy ra trong kỹ thuật doppler xung ? các phương pháp để tránh hiện tượng trên?" Định nghĩa: Aliasing là hiện tượng mà đỉnh phổ Doppler bị cắt cụt và được ghi sang đường đối diện của đường 0. Xảy ra khi : ∆F > PRF/2 Trong đó: ∆F : Tần số Doppler PRF: Tần số nhắc lại xung (số lần trong 1s mà chùm siêu âm đi đến đích và quay về) PRF=C/2d: trong đó: d là chiều sâu của mạch máu C là tốc độ của chùm tia siêu âm 4 biện pháp tránh hiện tượng aliasing: Chuyển đường 0
749 views
Nov 30, 2017
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