SPI Ultrasound Physics Review| 296 QUESTIONS| WITH VERIFIED COMPLETE SOLUTION

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SPI Ultrasound Physics Review| 296 QUESTIONS| WITH VERIFIED COMPLETE SOLUTIONWhen will the Doppler shift be the highest? A.when the beam is parallel to the direction of flow B.when the beam is at a... 45 degree angle to flow C.when the beam is perpendicular to the direction of flow D. Doppler shift is unrelated to beam angle Correct Answer: A.when the beam is parallel to the direction of flow Which of the following best describes the principles of hemodynamics? -The pressure difference required for blood to flow -The pressure created in a fluid system -A fluid's ability to resist change in shape or flow -the study of blood circulation Correct Answer: -the study of blood circulation The most effective way to eliminate aliasing on a color flow image is to: -decrease the frequency output -increase the color gain -decrease the velocity scale -increase the velocity scale Correct Answer: -increase the velocity scale The increase in velocity at the center of the lumen that gradually decreases towards the vessel wall is: -laminar flow -plug flow -pulsatile flow -parabolic flow Correct Answer: parabolic flow While scanning the proximal common carotid artery, you adjust the color window by making it wider. What happens to the frame rate? -it does NOT effect the frame rate -it increase -it decrease -the frame rate doubles Correct Answer: It decreases The effect of decreased pressure in regions of high flow speeds describes the: A+ -Bernoulli's Principle -volumetric flow rate -continuity rule -Poiseuille's law Correct Answer: -Bernoulli's Principle According to the Doppler equation, for any given velocity, the frequency shift will increase by increasing the: -pulse repetition frequency (PRF) -Doppler angle -pulse length -transmit frequency Correct Answer: Transmit frequency In the exercising patient, the distal arterioles are dilated. What type of flow pattern would most likely be demonstrated on spectral Doppler within the proximal vessels? -Biphasic -Triphasic -Monophasic -Venous Correct Answer: Monophasic The baseline control allows the shifting of the baseline up and down to reduce the appearance of aliasing. True False Correct Answer: True The Nyquist limit is: -the highest Doppler frequency that can be measured without the appearance of aliasing -caused by oversampling of the Doppler shifts -a reflected echo with amplitude higher than the actual structure -the lowest Doppler frequency that can be measured without the appearance of aliasing Correct Answer: -the highest Doppler frequency that can be measured without the appearance of aliasing When a patient is standing upright, what is the hydrostatic pressure at the level of the heart? - 15 mmHg 75 mmHg 0 mmHg 100 mmHg Correct Answer: 0 mmHg A+ You are performing a carotid duplex examination with the following parameters: 5 Mhz Doppler frequency, 6 kHz PRF, 4 cm depth, and 1.5 mm sample volume length. What is the aliasing frequency? 5 MHz 6 kHz 1.5 MHz 12 kHz 3 kHz Correct Answer: 3kHz, because its 1/2 the PRF The constant velocity in which blood travels across the vessel is: -Parabolic Flow Plug flow Pulsatile velocity spectral velocity Correct Answer: Plug flow The Nyquist limit is equal to: one half of the pulse repetition frequency the operating frequency the peak systolic velocity the pulse repetition frequency Correct Answer: one half of the pulse repetition frequency While performing a Doppler study, you underestimated the measurement of the Doppler angle of incidence. What error will result from this mistake? Mirror imaging of the Doppler spectrum will occur. No Doppler frequency shift will be detected. The frequency shift will be underestimated. Aliasing of the Doppler spectrum will occur. The velocity estimation will be inaccurate Correct Answer: The velocity estimation will be inaccurate What is the hydrostatic pressure when a patient is laying down? -30 mmHg -50 mmHg 50 mmHg zero Correct Answer: 0 A+ Which signal processing technique is used for color Doppler? It is not as accurate, but faster, than the technique used for spectral Doppler? autocorrelation zero crossing phase quadrature Fast Fourier transform Correct Answer: autocorrelation A flow condition in which parallel streamlines of flow are present within a vessel is termed: disturbed flow turbulent flow laminar flow aliased flow Correct Answer: lami [Show More]

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