Cardiac Echocardiography
Quiz by Sallye Gregg
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92 questions
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- Q1Nyquist limit - the deeper the gate depththere is decreased maximum velocity30s
- Q2Nyquist limit - the shallower the gate depth= increased maximum velocity30s
- Q3The Nyquist limit is determined byTransducer frequency ( lower frequency - increased velocity, higher frequency - lower velocity), and depth of gate - increased depth = lower velocity, shallower depth = higher velocity30s
- Q4What makes the doppler more accurate?The more parallel the Doppler beam is with blood flow the more accurate the velocity tracing. Cosine 0 degrees = 1, Cosine 20 degrees = 0.94, Cosine 50 degrees = 0.6430s
- Q5If the doppler is off perpendicular will you alwayssee more colorunderestimate the velocitysee less coloroverestimate the velocity30s
- Q6What are the 5 big things that you must do to optimize the pulse wave doppler1. Optimize the image ( interrogation angle and depth of the angle), 2 place gate , 3. Adjust baseline up or down as necessary, 4. Adjust velocity scale as needed, 5. switch to a lower frequency or CW if possible30s
- Q7Color flow doppler - how does it work?There are alternating lines of sound for 2d image and color flow information. each gate sends frequency shift info back to transducer and a color is assigned to that location.30s
- Q8What is the doppler shift in ultrasoundthe difference between the frequency sent out by the transducer and the frequency reflected back to the transducer from moving blood cells30s
- Q9What happens to sound as you move toward it?The pitch or frequency of the sound increases30s
- Q10What happens to sound as you move away from itthe frequency of the sound will decrease30s
- Q11Name 3 types of dopplersPulse wave, continuous wave, color flow ( which is a form of PW)30s
- Q12Where does the pulse wave doppler take its reading fromFrequency shifts are recorded during the time interval indicated by the depth gate30s
- Q13How does the color flow doppler work?There are alternating lines of sound for 2d and color flow information coming from the transducer. There are multiple gates along each line of sound. Each of these gates sends frequency shift info back to the transducer and a color is assigned to that location30s
- Q14What is a BART mapBlue away , red toward. No flow - no color, it is black.30s
- Q15What does enhanced color doppler do?It adds brighter color for increased velocity30s