Chapter 7 Q & A Flashcards

1
Q

a sound way is created by a transducer, reflects off an object and returns to the transducer. The depth of the reflector is 10cm in soft tissue

what is the go-return time?

A

130µs

time of flight equals depth multiplied by 13µs

10cm x 13 µs/cm = 130

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2
Q

a sound wave is created by a transducer reflects off an object and returns to the transducer. the go return time is 26µs.

What is the depth of the reflector?

A

2cm

2cm x 13µs =26µs

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3
Q

a sound wave is created by a transduce, relfects off an object and returns to the transducer. The go-return time is 26µs.

what is the total distance that the pulse traveled?

A

4cm

total distance is twice the depth of the reflector

depth =26µs/13µs=2cm

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4
Q

the maximum imaging depth (depth of view) during an ultraosuond exam is 10cm. The sonographer adjucts the imaging depth to 20 cm.

what happens to the Pulse Repition Period PRP?

A

doubles

PRP is directly related to imaging depth, if depth changes so does PRP proportionally

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5
Q

the maximum imaging depth (depth of view) during an ultraosuond exam is 10cm. The sonographer adjucts the imaging depth to 20 cm.

what happens to the Pulse Repition Frequency PRF?

A

it is halved

PRF is inversely related to depth of imaging, so if depth is changed PRF changes inversely and also proportionally

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6
Q

the imaging depth during an ultrasound exam is 10cm. The sonographer adjusts the imaging depth to 5cm.

What happens to the PRP?

A

it is halved

PRP is directly related to imaging depth

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7
Q

a sound wave is created by a transducer reflects off an object and returns to the transducer. The imaging depth is 10cm in soft tissue.

What is the maximum PRF?

A 7,700

B 7.7 kHz

c 3500Pa

D 7700µs

A

7.7 kHz

because the units are correct

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8
Q

a sound wave is created by a transducer reflects off an object and returns to the transducer. The maximum imaging depth is 7.7cm.

What is the PRF?

A

10000 Hz

77,000/7.7

in one second sound can go-return from an object 77,000cm deep

so divide 77,000 by the depth of 7.7 to get frequency

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9
Q

a sound wave is created by a transducer reflects offan object and returns to the transducer. The go-return time is 130µs.

What is the maximum PRF?

A

7700 HZ

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