RANGE EQUATION Flashcards
How is time of flight related to depth?
directly
Do greater pulse distances prolong or shorten time of flight?
prolong
Do smaller or larger pulse distances shorten time of flight?
smaller
What is the average speed of sound in soft tissue?
1.54mm/μs
How is time of flight and distance of a pulse travels related?
directly related
How is the depth of a reflector calculated?
1.54 x go- return-time ÷ 2
What is the 13 μs rule?
For every 13 μs of go return time, the reflector depth is 1 cm deeper in soft tissue.
If it takes 39 μs for the time of flight, what is the reflector depth?
3 cm
If it takes 13 μs for the time of flight what is the reflector depth?
1 cm
If it takes 26 μs for the time of flight what is the reflector depth?
2 cm
What is the total distance traveled of a reflector depth of 3 cm?
6cm
True or false, the total distance that a pulse travels is three times the reflector depth?
False, it is twice the reflector depth.
What is the total distance traveled of a reflector depth of 4 cm?
8 cm
How is the pulse repetition period related to the maximum imaging depth?
Directly related
How is the PRP calculated?
Imaging depth (cm) X 13 μs
When the depth of view is shallow is the PRP short or long?
short
When the depth of view is deep is the PRP short or long?
long
What is the PRP when the depth of view is 12 cm?
156 μs
How is PRF related to imaging depth?
inversely related
Is the PRF high or low when the depth of view is shallow?
high
Is the PRF high or low when the depth of view is deep?
low
What is the equation for PRF in soft tissue?
77,000 cm/ s ÷ imaging depth
