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DAVIES Doppler Questions - Complete Solutions

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DAVIES Doppler Questions According to the Doppler equation, for any given velocity, the frequency shift will increase by increasing the: a) Doppler angle b) Transmit frequency c) Pulse length d) Pulse repetition frequency e) All of the Above - b) Transmit frequency What limitation is present when you use high PRF Doppler? a) Frame rate b) Spatial resolution c) Sensitivity to slow flow d) Range resolution e) Both C and D - e) Both C and D The presence of the systolic spectral window of the Doppler waveform is affected by: a) Sample volume size b) Turbulent flow c) Doppler gain d) Position of the Doppler sample volume e) All of the above - e) All of the above If you increase the Doppler transmit frequency, which of the following will result? a) The velocity will increase b) The doppler frequency shift will increase c) The penetration will increase d) The frame rate will increase e) The Nyquist limit will increase - b) The doppler frequency shift will increase What would be the most likely result from increasing the transmit frequency of the color doppler? a) Improved sensitivity to slow flow b) Improved penetration for imaging flow in deep tissues c) Reduced flash artifact obscuring small vessel flow d) Reduced color doppler aliasing e) Improved visibility of complex flow hemodynamics - a) Improved sensitivity to slow flow What type of Doppler device uses two elements, one to receive and one to transmit? a) Power doppler b) Color doppler c) Continuous wave Doppler d) Pulsed wave Doppler e) All the above - c) Continuous wave Doppler If you increased the Doppler angle during an exam, what would be the expected result? a) Doppler frequency shift would decrease b) Aliasing would be increased c) Flow velocity would increase d) Sound velocity would increase e) None of the above - a) Doppler frequency shift would decrease What display method below will help to demonstrate flow turbulence with color Doppler? a) Autocorrelation b) Variance c) Fast fourier analysis d) Zero crossing detection e) Phase quadrature detection - b) Variance Aliasing is a potential problem in PW Doppler because of: a) The use of high pulse repetition frequencies b) The doppler signal being sampled rather than recorded continuously c) Dynamic focusing d) The motion of the interface perpendicular to ultrasound wave propagation e) Perpendicular incidence - b) The doppler signal being sampled rather than recorded continuously Decreased pressure occurs in areas of high flow speeds. This is known as: a) The continuity rule b) The Reynolds number c) Poiseulle's law d) TheBernoulii effect e) The Nyquist limit - d) The Bernoulii effect You have increased the packet size while using color doppler to evaluate flow. What negative result will occur from this action? a) Decreased penetration b) Decreased flow sensitivity

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