Edelmen book (pulsed waves) Flashcards
Actual time from the start of a pulse to the end of that pulse. “the on time”
Pulse duration / us
Distance that a pulse occupies in space from the start to the end of a pulse
Spatial pulse length / mm
The time from the start of one pulse to the start of the next pulse. Includes the listening time
Pulse repetition period , ms
T/F prp is unrelated to period
TRUE
Number of pulses that an us transmits into the body each second
Pulse repetition frequency / hz
T/F prf is unrelated to frequency
TRUE
Percentage of fraction of time that the system transmits a pulse
Duty factor
Shallow imaging qualities (listening time, PRP, PRF, DF)
less listening time, shorter PRP, higher PRF, higher DF
When adjusting the imaging depth, the system changes the ___
PRP, PRF, and DF
What is adjustable within these parameters
PRP, PRF, duty factor
PRP has what relation with the maximum imaging depth
Directly related
PRF is ___ related to depth
Inversely
PRP formula for 13 microsecond rule
PRP = depth cm x 13 us/cm
When the depth of view is set to 10 cm, the prp is
10 x 13 = 130 us
What determines pulse duration
The source of a wave
Pulse duration formula
Period x # of cycles in a pulse
Is pulse duration adjustable
No unless changing transducers
Spl formula
Wavelength x # of cycles in the pulse
Prf has the same unites as frequency which are
Hertz , hz , or per second (1/second)
If the maximum imagine depth is unchanged then pro and prf ____
Stay the same
If there is a longer pulse duration used then duty factor is ____
Increased
Duty factor formula
Pulse duration / PRP
Duty factor in CW is what value
1.0 or 100%
What happens to the duty factor when depth of view increases
Decreases
