Pulsed Waves Flashcards
What are the 5 parameters describing pulsed sound?
- Duty Factor
- Pulse duration
- Pulse Repetition Period
- Pulse Repetition Frequency
- Spatial Pulse Length
What is a collection of cycles that travel together?
A pulse of ultrasound
True or False, a pulse must have a beginning and an end?
True
True or False A pulse is made of individual cycles and propagates as individual pulses.
False, a pulse travels as a single unit.
What is another term for a pulses “on time”?
transit or talking time
What is another term for a pulses “ off time”?
Receive or listening time
What is the term used to describe the actual time a pulse starts and ends?
Pulse duration
What represents the single talking time of a pulse?
Pulse duration
What are the units of pulse duration?
Time
What is pulse duration determined by?
by the sound source
Is pulse duration adjustable?
No
What is the equation for pulse duration?
PD = # of cycles x period
# of cycles / frequency
What is pulse duration directly proportional to?
Number of cycles of a pulse and period
What is pulse duration inversely related to?
Frequency
What characteristics of a pulse create a pulse of long duration?
many cycles or individual cycles with a long period.
What characteristics of a pulse create a pulse of a short duration?
Few cycles or individual cycles with a short period.
Is a short or long-duration pulse desired to create an image with greater accuracy?
short duration pulse
What term is used to describe the distance from the start of the pulse to the end of that same pulse?
spatial pulse length
What are the units of spatial pulse length?
units of distance
What is spatial pulse length determined by?
Both source and medium
What is the equation for spatial pulse lenght?
SPL= # of cycles x wavelength
True or False Spatial pulse length & wavelength are both determined by sound source and medium?
True
Are you able to adjust spatial pulse length?
No
What is spatial pulse length directly proportional to?
of cycles in a pulse & wavelength
