# Ch 7: Range Equation Flashcards

1
Q

The elapsed time from pulse creation to pulse reception is called the…

A

go-return time or time-of-flight.

2
Q

Time-of-flight and depth are ___ related.

A

directly. The greater the depth imaged, the longer the time-of-flight.

3
Q

1.54 mm/microseconds x go-return time (microseconds) divided by 2 =

A

depth (mm)

4
Q

For every 13 microseconds of go-return time, the object creating the reflection is ___ deeper in the body.

A

1 cm

5
Q

When a pulse’s time-of-flight is 26 microseconds, the reflector is how deep?

A

2 cm

6
Q

When a pulse’s time-of-flight is 39 microseconds, the reflector is how deep?

A

3 cm

7
Q

Since a pulse travels to the reflector and back to the transducer, the total distance that a pulse travels is ___ the reflector depth.

A

twice

8
Q

imaging depth (cm) x 13 microseconds/cm =

A

PRP (microseconds)

9
Q

PRP is ___ related to the maximum imaging depth.

A

directly. The greater the depth, the longer the PRP.

10
Q

If the depth is 10 cm, the PRP is…

A

130 microseconds. (10 x 13 microseconds)

11
Q

If the depth is 5 cm, the PRP is…

A

65 microseconds. (5 x 13 microseconds)

12
Q

PRF is ___ related to maximum imaging depth.

A

inversely. The greater the depth, the lower the PRF.

13
Q

77,000 cm/s divided by imaging depth (cm) =

A

PRF (Hz)

14
Q

If the depth is 7.7 cm, the PRF is…

A

10,000 Hz. (77,000/7.7 = 10,000)

15
Q

If the depth is 15.4 cm, the PRF is…

A

5,000 Hz. (77,000/15.4 = 5,000)