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 Doppler
- b. Oscillator
- c. Fourier transformer
- d. Phase quadrature
2. Which of the following is true for continuous-wave Doppler devices?
- a. It only needs to have one piezoelectric element
- b. It must have at least two piezoelectric elements
- c. It must have three piezoelectric elements
- d. No piezoelectric elements are needed for CW Doppler
3. Which of the following will result in aliasing?
- a. Too low an operating frequency
- b. Increased sampling of the blood flow
- c. Undersampling of the blood flow
- d. Too high a Doppler angle
4. Which mathematical processing technique is used to analyze the data and produce a spectral waveform?
- a. Amplitude shifting
- b. Autocorrelation
- c. Amplitude sampling
- d. Fast Fourier transform
5. Which of the following represents the resistive index?
- a. Peak systolic velocity minus the end diastolic velocity divided by the mean velocity
- b. End diastolic velocity minus the peak systolic velocity divided by the peak systolic velocity
- c. Peak systolic velocity minus the end diastolic velocity divided by the peak systolic velocity
- d. Peak systolic velocity minus the end diastolic velocity divided by the end diastolic velocity
6. What does the brightness of the dots that make up the spectral display represent?
- a. The number of red blood cells present
- b. The velocity of the signal
- c. The frequency shift
- d. The amount of turbulence present
7. What is said to occur when the window of the spectral Doppler display is filled-in?
- a. There is spectral broadening
- b. There is laminar flow
- c. The Doppler gate is small and centered within the vessel
- d. There is only one velocity at a given point in time
8. In order to add more spectral Doppler waveforms to the display, what setting on the machine should be adjusted?
- a. PRF
- b. Sweep speed
- c. Heart rate
- d. Gain
9. Which of the following may result if the spectral Doppler gain is too high?
- a. Too much output power sent into the patient
- b. Undermeasurement of the velocities
- c. Overmeasurement of the velocities
- d. An image that is too dark
10. The Doppler shift is lowest at what angle to flow?
- a. 0_
- b. 45_
- c. 60_
- d. 90_

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