ARDMS SPI Exam Review TEST 18 October 28, 2017 by Rana Waqar Leave a Comment 1. What is the component of the ultrasound machine used to detect positive versus negative frequency shifts?a. Analog Dopplerb. Oscillatorc. Fourier transformerd. Phase quadrature2. Which of the following is true for continuous-wave Doppler devices?a. It only needs to have one piezoelectric elementb. It must have at least two piezoelectric elementsc. It must have three piezoelectric elementsd. No piezoelectric elements are needed for CW Doppler3. Which of the following will result in aliasing?a. Too low an operating frequencyb. Increased sampling of the blood flowc. Undersampling of the blood flowd. Too high a Doppler angle4. Which mathematical processing technique is used to analyze the data and produce a spectral waveform?a. Amplitude shiftingb. Autocorrelationc. Amplitude samplingd. Fast Fourier transform5. Which of the following represents the resistive index?a. Peak systolic velocity minus the end diastolic velocity divided by the mean velocityb. End diastolic velocity minus the peak systolic velocity divided by the peak systolic velocityc. Peak systolic velocity minus the end diastolic velocity divided by the peak systolic velocityd. Peak systolic velocity minus the end diastolic velocity divided by the end diastolic velocity6. What does the brightness of the dots that make up the spectral display represent?a. The number of red blood cells presentb. The velocity of the signalc. The frequency shiftd. The amount of turbulence present7. What is said to occur when the window of the spectral Doppler display is filled-in?a. There is spectral broadeningb. There is laminar flowc. The Doppler gate is small and centered within the vesseld. There is only one velocity at a given point in time8. In order to add more spectral Doppler waveforms to the display, what setting on the machine should be adjusted?a. PRFb. Sweep speedc. Heart rated. Gain9. Which of the following may result if the spectral Doppler gain is too high?a. Too much output power sent into the patientb. Undermeasurement of the velocitiesc. Overmeasurement of the velocitiesd. An image that is too dark10. The Doppler shift is lowest at what angle to flow?a. 0_b. 45_c. 60_d. 90_ For More questions please join Our facebook group: https://www.facebook.com/groups/249298882082586/?ref=br_rs
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