Ch. 7 Physics: Range Equation

Question 1

Anatomical images are created by sound waves traveling to a __________ and then back to the ___________.

Answer 1

Reflector and sound source

Question 2

___________ the sound pulse takes to complete its journey, determines the accurate position of the reflector

Answer 2

The round-trip time

Question 3

Elapsed time it takes from pulse creation to pulse reception.

Answer 3

Time of flight (go- return time)

Question 4

Reflectors located ____________ have a shorter time of flight

Answer 4

superficially

Question 5

______ reflectors will have a longer go- return time

Answer 5

Deeper

Question 6

time of flight and distance are __________ related

Answer 6

Directly

Question 7

When the depth of one reflector is twice as deep as another, the pulse will take _______ the amount of time to return to the transducer.

Answer 7

twice

Depth (mm) = 1.54 mm/microsec x go return time (microsec)

Question 8

For every 13 microseconds of go return time an object is located ___ cm deep in the body

Answer 8

1 cm

Question 9

PRF is _________ related to the maximum imaging depth

Answer 9

inversely

Question 10

What is the formula for PRP and imaging depth

Answer 10

PRP (microsec) = imaging depth (cm) x 13 microsec/cm

Question 11

What is the formula for PRF and maximum imaging depth

Answer 11

PRF (Hz) = 77,000 cm/s / imaging depth (cm)