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FREE AND STUDY GAMES ABOUT SPI MUST KNOW EXAM
QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -173 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: The primary disadvantage of CW Doppler is what?
Answer:
Range ambiguity
Question 2: Increase Frequency
Answer:
Increase Backscatter
Question 3: What can you do to avoid aliasing?
Answer:
Increase velocity scale, decrease image sampling depth, decrease transducer frequency, alter the baseline, increase Doppler intercept angle (e.g 0 degrees towards 90 degrees), utilize high PRF or CW
Question 4: What is packet size?
Answer:
The number of pulses sent down one line to create one scan line of color.
Question 5: The sonographer can control what with the transmit gain control?
Answer:
The pulser
Question 6: The range equation uses what?
Answer:
The propagation speed and the round trip time (divided by 2) to determine he distance to a reflector
Question 7: Step 4 in the processing of echo information
Answer:
analog to digital conversion (preprocessing) with storage of the binary number in the memory (scan converter)
Question 8: The Narrower the Beam
Answer:
The better the lateral resolution
Question 9: The Stiffer the Material
Answer:
The higher the propagation speed
Question 10: The reflected angle always equals the
Answer:
incidence angle
Question 11: What is the standard frame rate?
Answer:
30 frames per second (30 Hz)
Question 12: The Damping Block
Answer:
is placed behind the piezoelectric element, reduces the ringing of the element, reduces SPL and PD which improves axial resolution
Question 13: Snell's Law (Law of Refraction)
Answer:
predicts when refraction will occur and how much refraction will occur by predicting the transmitted angle
Question 14: What is color flow Doppler?
Answer:
A multigate PW Doppler technique which presents the mean velocity of blood flow.
Question 15: M-mode is a B-mode operation displaying what?
Answer:
Motion over time with excellent temporal resolution.
Question 16: Temporal resolution is improved how?
Answer:
By increasing the frame rate.
Question 17: Harmonic imaging reduces
Answer:
near field reverberation
Question 18: Only transmit focusing is controlled by?
Answer:
The sonographer
Question 19: Shorter SPL
Answer:
Shorter PD
Question 20: Electronic transmit focusing
Answer:
curves the pulses going to the piezoelectric element
Question 21: The focal point
Answer:
is the narrowest portion of the sound beam where intensity is the greatest and lateral resolution is the best
Question 22: What is spectral broadening?
Answer:
The vertical thickening of the Doppler spectrum, results in window fill-in and indicates turbulent flow.
Question 23: Postprocessing is what?
Answer:
The assignment of gray shades to numbers leaving the memory.
Question 24: Intensity is
Answer:
Power(W)/Area(cm^2)
Question 25: Reflections from scatter reflectors
Answer:
are weaker than reflections from specular reflectors
Question 26: The linear sequenced array transducer
Answer:
is a large electronic transducer which creates a linear display
Question 27: What are reverberations?
Answer:
Multiple echoes, equally spaced usually located close to the transducer.
Question 28: Step 5 in the processing of echo information
Answer:
the assignment of a shade of gray to the binary number leaving the memory
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