Chapter 4 - p.95 Flashcards
The frequency and the __________ are reciprocals
period
The pulse repetition frequency and the _________ repetition ______________ are reciprocals
pulse
period
The _________, like the period, has units of ________________.
PRP
time (seconds)
The ______________ like the _____________ has units of one over time , which has the name _________
PRF
Frequency
Hertz
The _________- is the time between pulses repeating
PRP
The ___________ is the frequency at which the pulses repeat
PRF
The deeper the imaging depth , the lower the __________ or the more time it takes before repeating a pulse.
PRF
The frame ________ depends on how much time it takes to shoot one line, and the number of _________ within the frame.
time
lines
If one line take 0.1 msec, and there are 120 lines in one frame, the frame time is ____________.
12 msec
The pulse duration has units of _________
time
If a pulse has 4 cycles and each cycle last 1 msec, the ________ ____________ equals _____________.
pulse duration
4 msec
If a pulse has __________ and each cycle last 2 msec, then the pulse duration equals 12 msec.
6 cycles
The time for a cycle to repeat itself is called the ____________-
period
The ______________ equals the number of cycles multiplied by the time for one cycle to occur ans is called the period.
pulse duration
The __________ ____________ is the percentage of time the pulse is on divided by the total time between repeating pulses.
duty cycle
The “total time” between repeating pulses is called the __________ __________ ___________
pulse repetition period (PRP)
Since the duty cycle is the “on time” divided by the ________, the ________ cycle equals the pulse _________ divided by the pulse repetition period.
total time,
duty
duration
The duty cycle is also called the duty _________.
factor
A duty factor of _________ means the pulse is always on/
1
A duty factor of __________ means the pulse duration equals one half the pulse repetition period
0.5
If the duty cycle is 0.33 and the PRP is 1 msec, then the pulse duration is ____________.
0.33 msec
IF the duty cycle is .33 and the pulse duration is 0.66 seconds, then the PRP is ________-.
2 seconds
THe spatial pulse has units of ________ whereas the pulse duration has units of __________
distance
time
The ________ ________ __________ equals the number of cycles multiplied by the wavelength.
Spatial pulse length
The operating frequency is the same as the transmit _____________
frequency
The -___________ is defined as the maximum frequency minus the minimum frequency over which a transducer or system has sensitivity
bandwidth
THe _________ bandwidth is defined as the divided by the operating frequency
fractional
THe quality factor is the inverse of the ________ bandwidth
fractional
Since the fractional bandwidth equals the bandwidth divided by the operating frequency, and since the quality factor is the inverse of the fractional bandwidth , the quality factor equals the operating frequency divided by the ___________
bandwidth
A shorter pulse duration leads to a wider ________–
bandwidth
__________ spectral Doppler requires the least bandwidth.
CW
Transmitting at 2 MHz implies that the center frequency of the bandwidth being used is _________.
2 MHz
A _______ __________ is used to shorten the ringdown of a transducer
Backing material (damping material)
Shortening the ring down of a transducer also shortens the -________ _______ ________ improving range resolution.
spatial pulse length
The motivation for using a pulsed mode instead of a continuous mode is because CW has no ___________ resolution.
range
