Ultrasound Physics - Chapter 4: Describing Pulsed Waves

6 Hz (I chose the smallest # because these 2 are inversely related, so if it says one is long, the other must be the short one)
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Terms in this set (37)
6 Hz (I chose the smallest # because these 2 are inversely related, so if it says one is long, the other must be the short one)
Which of these 4 values for pulse repetition frequency would have the longest pulse repetition period?
2 kHz
4000 Hz
6 Hz
1 kHz
5 ms (change them all to seconds and find the lowest one, since that will be opposite like before)
Four pulses have pulse repetition periods as listed below. Which of the following 4 waves has the highest pulse repetition frequency?
8 s
80 ms
5 ms
400 ks
20 kHz (just picked the biggest # after converting)
Which of these 4 pulses with PRFs listed below has the shortest pulse repetition period?
12 kHz
6000 Hz
20 kHz
1 kHz
8 s (biggest #)
Four waves have pulse repetition periods as listed below. Which of the following 4 waves has the lowest pulse repetition frequency?
8 s
80 microseconds
8000 nanoseconds
800 ms
False. Two waves can never have identical PRFs if their pulse repetition periods are different
T/F: Two waves can have identical pulse repetitions frequencies, even if their pulse repetition periods are different.
True. Period and pulse repetition frequency are unrelated.
T/F: Two waves can have identical PRFs, even if their periods are different.
True. Frequency and pulse repetition frequency are unrelated.
T/F: Two waves can have identical PRFs, even if their frequencies are different.
True
T/F: PRF and pulse repetition period are determined only by the imaging depth.
increases
If all other factors remain unchanged, what happens to the duty factor when the pulse repetition frequency increases?
decreases
If all other factors remain unchanged, what happens to the duty factor when imaging depth increases?
decreasesIf all other factors remain unchanged, what happens to the duty factor when the PRP increases?increasesIf all other factors remain unchanged, what happens to the duty factor when the sonographer uses a new transducer w/ a longer pulse duration?0.001What is the duty factor if pulse duration is 1 microsecond and the pulse repetition period is 1 ms?low PRFWhich of the following terms does not belong with the others? a. high duty factor b. shallow imaging c. low PRF d. short pulse repetition periodshallow imagingWhich of the following terms does not belong with the others? a. low duty factor b. shallow imaging c. low PRF d. long pulse repetition periodpulse duration_____ is the time from the start of a pulse to the end of that pulse.pulse repetition period_____ is the time from the start of a pulse to the start of the next pulse.100%Duty factor of A?33%Duty factor of B?0%Duty factor of C?50%Duty factor of D?D (because PRP is shortest)Which of the patterns indicate a system with a superficial imaging depth?B (because PRP is longest)Which of the patterns indicates a system w/ a deep imaging depth?A and CWhich 2 of the patterns identify an ultrasound system that cannot perform anatomic imaging?pulse durationWhich of the following describes line A?spatial pulse lengthWhich of the following describes line A?amplitudeWhich of the following describes line B?periodWhich of the following describes line D?wavelengthWhich of the following describes line D?none of the above (only listening time)Which of the following describes line E?peak to peak amplitudeWhich of the following describes line F?A/CWhich of the following best describes the duty factor?pulse repetition periodPulse repetition frequency is the reciprocal of _____.- pulse repetition frequency - duty factor - pulse repetition periodBy changing the imaging depth, which of the following does the operator also change (more than 1 may be correct)?1.8 km/s (same because it is continuous)The speed of a 5 MHz continuous wave is 1.8 km/sec. The wave is then pulsed with a duty factor of 0.5. Calculate the new propagation speed.0.001, or 10 to the -3.What is the duty factor if the pulse duration is 1 microsecond and the pulse repetition period is 1 ms?0.001, or 0.1% (0.001/1)What is the duty factor if the pulse duration is 1 millisecond and the pulse repetition period is 1 second?