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FREE SONOGRAPHY AND STUDY GAMES ABOUT SPI
CHAPTER 4 EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -80 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: What is duty factor inversely related to?
Answer:
Image depth
Question 2: What is pulse duration directly proportional to?
Answer:
period
Question 3: What does pulse repetition period consist of?
Answer:
one "on" time and one "off" time
Question 4: What does shallow imaging consists of?
Answer:
less listening, shorter PRP, higher PRF, higher duty factor
Question 5: What are pulses?
Answer:
a collection of cycles that travel together and is acoustic energy that creates pictures
Question 6: What is another word for transmit time?
Answer:
pulse duration
Question 7: Pulse duration is equal to
Answer:
= # cycles x period (micro. sec.) Question 8: If all other factors remain unchanged, what happens to the duty factor when the PRP increases?
Answer:
decreases
Question 9: What is pulse repetition period determined by?
Answer:
sound source and imaging depth Question 10: What is the duty factor if the pulse duration is 1 micro. sec., and the PRP is 1 ms?
Answer:
0.001 or 10^-3
Question 11: What is pulse duration inversely proportional to?
Answer:
frequency Question 12: What is the number of cycles in the pulse directly proportional to?
Answer:
Pulse duration
Question 13: Why can pulse duration not be adjusted by the sonographer?
Answer:
because it is a characteristic of the transducer and has a fixed value
Question 14: What is PRF inversely related to?
Answer:
depth of view Question 15: When the sonographer adjusts the imaging depth, what else do they only alter at the same time?
Answer:
the listening time
Question 16: What is the pulse repetition frequency determined by?
Answer:
sound source
Question 17: What is spatial pulse length directly proportional to?
Answer:
#cycles in a pulse Question 18: The speed of a 5 MHz continuous wave is 18 km/sec. The wave is then pulsed with a duty factor of 0.5. Calculate the new speed?
Answer:
1.8 km/sec. Propagation speed for pulsed and continuous wave sound is the same in this case, it depends only upon the medium
Question 19: What two characteristics create pulses of long duration?
Answer:
many cycles in a pulse or individual cycles with long periods
Question 20: What is pulse duration?
Answer:
the time from the start of a pulse to the end of that pulse
Question 21: What must a pulse have?
Answer:
a beginning and an end
Question 22: What is spatial pulse length inversely proportional to?
Answer:
frequency
Question 23: What is the formula for pulse duration?
Answer:
pulse duration (micro sec.) = # cycles/frequency (MHz)
Question 24: When adjusting image depth, what else changes?
Answer:
the PRP, PRF, and duty factor
Question 25: What two components does pulse ultrasound have?
Answer:
"on" and "off" time Question 26: Can two waves have identical PRFs, even if their frequencies are different?
Answer:
True. Frequency and PRF are unrelated
Question 27: What is duty factor determined by?
Answer:
sound source Question 28: What are the parameters that describe both pulsed and continuous waves?
Answer:
the period, frequency, wavelength, and speed
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