Range Equation Flashcards
What does ‘go-return time’ refer to?
The elapsed time from pulse creation to pulse reception
Also known as time-of-flight.
How is the depth of a reflector calculated?
(mm) = 1.54 mm/us x go-return time (us)
This equation relates the time taken for the pulse to travel to the reflector and back.
What is the 13-microsecond Rule?
For every 13 microseconds of go-return time, the object creating the reflection is 1 cm deep in the body
This rule helps in estimating the depth of reflectors based on time-of-flight.
What is the relationship between PRF and DOV?
PRF is inversely related to DOV
PRF stands for Pulse Repetition Frequency, and DOV stands for Depth of View.
What is the relationship between PRP and DOV?
PRP is directly related to DOV
PRP stands for Pulse Repetition Period.
What is the time of flight for a reflector at a depth of 1 cm?
13 microseconds
This is based on the 13-microsecond Rule.
What is the time of flight for a reflector at a depth of 2 cm?
26 microseconds
What is the time of flight for a reflector at a depth of 3 cm?
39 microseconds
What is the time of flight for a reflector at a depth of 4 cm?
52 microseconds
What is the time of flight for a reflector at a depth of 10 cm?
130 microseconds
What is the formula for calculating imaging depth?
(us) = imaging depth (cm) x 13 us/cm
What is the PRF value related to DOV?
77,000 Hz
This is derived from the speed of sound in soft tissue.
What does ‘shallow DOV’ indicate?
High PRF and short imaging depth
What does ‘deep DOV’ indicate?
Low PRF and long imaging depth
Fill in the blank: The total distance traveled is ______ for a depth of 2 cm.
4 cm
