SPI Mock Exam 4 Wrong Answers Flashcards
Harmonic frequencies are generated
A. from constructive and destructive interference
B. from the edges of each piezoelectric element
C. as the sound wave travels through the medium
D. as the reflected wave hits new tissue boundaries on the return path
C
Which of the following system functions converts the received signal from radiofrequency form to amplitude form
A. compression
B. coded excitation
C. bandpass filtering
D. demodulation/detection
D
Which of the following is correct regarding the wavelength of a sound wave
A. sound waves produced by a pulsed wave transducer have longer wavelengths than sound waves produced by a continuous wave transducer
B. sound waves produced by a continuous wave transducer have longer wavelengths than sound waves produced by a pulsed wave transducer
C. shorter wavelengths are preferred for better image resolution
D. frequency and wavelength will remain constant as the beam travels through soft tissue and attenuation occurs
C
Grating lobes most commonly
A. reduce the visibility of color doppler
B. are produced by highly reflective boundaries
C. result in missing information on the image
D. occur with linear arrays
D
As the prop speed of the crystal increases, the frequency of the transducer
A. decreases
B. does not change
C. increases
D. depends on the thickness and diameter of the crystal
C
Which of the following describes a normal result for uniformity testing of the ultrasound system
A. all images in a randomly selected exam demonstrate a constant thermal index
B. images taken of the same structure with different probes of the same frequency demonstrate uniform echo amplitude between the compared images
C. all images in a randomly selected exam demonstrate a constant mechanical index
D. TGC set to produce an image with equal echo amplitude across the screen and then when the TGC function is turned off, the echoes in the far field are reduced in amplitude
D
What system control can be used to reduce the appearance of clutter on a color doppler image
A. decreasing color priority
B. increasing color threshold
C. decreasing PRF
D. increasing persistence
A
Which of the following correctly describes therapeutic US applications
A. therapeutic US uses higher frequencies than diagnostic US
B. therapeutic US used transducers with round elements and diagnostic US transducers use square elements
C. therapeutic transducers use sound to produce heat and vibration, while diagnostic US transducers use sound to create images
D. therapeutic US uses lower intensities than diagnostic US
C
What part of the ultrasound system is responsible for changing the element function back and forth from transmit to receive
A. transducer
B. scan converter
C. beam former
D. FFT
C
As a sound wave travels through soft tissue, what happens to the period of the wave
A. increases
B. decreases
C. remains constant
D. unable to determine
C
Which of the following is true regarding using color doppler
A. color doppler is more sensitive than power doppler because it can demonstrate the direction of flow
B. color doppler can be used to assess the peak velocity of the blood flow in a vessel
C. color doppler provides a very limited evaluation on its own and is mainly used as a guide for the PW doppler cursor
D. blood cells have a lower reflectivity than soft tissue cells, which leads to limitations for color doppler evaluation of dep vessels seen on the 2D exam
D
While scanning, you decide to increase the image contrast. What console control will be adjusted
A. increase overall gain
B. reduce demodulation
C. increase compression
D. increase rejection
D
Increasing the transducer frequency on a multihertz transducer will
A. improve the axial resolution only in the near field
B. improve the axial resolution in the near and far field
C. increase the spatial pulse length
D. improve the lateral resolution in the near field
B
You are performing a liver ultrasound using the intercostal window and the entire image is very bright. What is the best way to adjust the image to the appropriate brightness level
A. adjust the overall gain
B. adjust the far field TGCs
C. adjust the power output
D. adjust the near field TGCs
C
All of the following correctly describe a normal doppler waveform of an artery from the lower extremity except
A. the triphasic waveform has two components of normal retrograde flow during the cardiac cycle
B. the triphasic waveform has a normal retrograde flow component during the cardiac cycle
C. there will be a high resistance peaked waveform with a small amount of flow reversal in diastole
D. the triphasic waveform has two components of antegrade flow during the cardiac cycle
A
