Flashcards in Lesson 22 (Part 4) Deck (16)
What happens to the doppler shift if the doppler angle is doubled?
It gets doubled also
What kind technique is used to yield doppler information in real time?
Is doppler shift dependant on doppler angle?
What happens to the frame rate if the ensemble length increases?
What technique is commonly used to detect echo doppler shifts in colour doppler intsruments?
What reduces the frame rate of a colour doppler image?
1. Wider colour window
2. Increased ensemble length
What does increasing ensemble length do to colour sensitivity?
What does increasing ensemble length do to accuracy?
What does increasing ensemble length do to frame rate?
What are colour map baseline always represented by?
What happens to the frame rate when the width of the colour window is doubled?
It gets halved
What does autocorrelation produce? (2)
1. The mean value of the doppler shift
What does steering the colour window to the right and left change? (2)
1. The doppler angle
2. The doppler shift
What are colour doppler frame rates compared to gray scale frame rates?
What is doppler shift imaging compared to doppler power imaging? (4)
1. More sensitive
2. Angle independent
3. Aliasing independent
4. Speed independent