Ch.4-Des Pulse Waves Word Scramble

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Question	Answer
Short bursts of acoustic energy are also known as _______.	pulses
Pulse duration is the ______ ______ from the start of a pulse to the end of that pulse.	actual time
_______ ______ is reported in units of time, such as us, ms or seconds.	Pulse duration
The typical value of pulse duration in diagnostic ultrasound is what?	0.3 to 2.0 us.
Pulse duration is determined by the:	sound source
Is pulse duration adjustable?	No
What is the formula for pulse diration?	# of cycles x period
Pulse duration is _______ related to the number of cycles.	directly
Pulse duration is _______ proportional to period.	directly
Pulse duration is _______ proportional to the frequency.	inversely
Which type of pulse is more desirable in diagnostic imaging?	short
What is the distance that a pulse occupies in space from the start to the end of a pulse called?	spatial pulse length
Spatial pulse length has units of what?	distance
What are the typical values of spatial pulse length in soft tissue?	from 0.1 to 1.0mm
What determines pulse length?	both the source and the medium
Is pulse length adjustable?	No
Spatial pulse length (mm)=	# cycles x wavelength (mm)
Spatial pulse length is _____ proportional to the number of cycles in the pulse.	directly
Spatial pulse length is ______ proportional to wavelength.	directly
Spatial pulse length is ________ proportional to frequency.	inversely
Pulse duration is the ______ that a pulse is "on" and is typically measured in microseconds.	time
Pulse length is the _________ of the pulse end to end, typically measured in millimeters.	distance
_______ ________ _______ is the time from the start of one pulse to the start of the next pulse.	Pulse repetiton period
Pulse repetition period is reported in untis of time, such as _____.	ms
Pulse repetition period is determined by the _________.	sound source
Can the sonographer adjust the pulse repetition period?	Yes
As depth of view increases, pulse repetition period _______.	increases
As depth of view decreases, pulse repetition period _______.	decreases
_________ ________ _______ is the number of pulses that an ultrasound system transmits into the body each second.	Pulse repetition frequency
Pulse repetition frequency is reported in units of ___.	Hz
The typical valu of pulse repetition frequency is:	1,000 to 10,000 Hz
Pulse repetition frequency is determined by the _______.	source
Can the sonographer adjust the pulse repetition frequency?	Yes
As depth of view increases, pulse repetition frequency _____.	decreases
As depth of view decreases, pulse repetition frequency ______.	increases
An ultrasound machine is imaging to a depth of 2 cm. Would the pulse repetition frequency be described as high or low?	high
When the sonographer adjusts the depth of view to 20 cm, what happens to the pulse repetition frequency?	it is reduced
PRP and PRF are _______ related.	inversely
PRF x PRP=	1
What is the complementary metric unit for PRP?	seconds
What is the complementary metric unit for PRF?	hertz
True or False. Two waves can have identical pulse repetition frequencies, even if their pulse repetitoin periods are different.	False. Two waves can never have identical PRFs if their pulse repetition periods are different.
True or False. Two waves can have identical PRFs, even if their periods are different.	True. Period and pulse repetiton frequency are unrelated.
True or False. Two waves can have identical PRFs, even if their frequencies are different.	True. Frequency and pulse repetition frequency area unrelated.
True or False. PRF and pulse repetition period are determined only by the imaging depth.	True
What describes the percentage or fraction of time that the system is transmitting a pulse?	duty factor
What determines duty factor?	source
Is duty factor adjustable?	yes
Less listening, shorter PRP, higher PRF and higher duty factor=	shallow imaging
More listening, longer PRP, lower PRF and lower duty factor=	deeper imaging
When all other factors remain unchanged, what happens to the duty factor when the PRF increases?	increases
If all other factors remain unchanged, what happens to the duty factor when the PRP increases?	decreases
If all other factors remain unchanged, what happens to the duty factor when imaging depth increases?	decreases
If all other factors remain unchanged, what happens to the duty factor when the sonographer uses a new transducer with a longer pulse duration?	increases
What is the duty if the pulse duration is 1 us and the PRP is 1 ms?	0.001
________ is the time from the start of a pulse to the end of that pulse.	Pulse duration
________ is the time from the start of a pulse to the start of the next pulse.	Pulse repetition period
Pulse repetiton frequency is the reciprocal of _______.	pulse repetition period

Created by: jady1999