Chapter 7 Q & A Flashcards
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?
130µs
time of flight equals depth multiplied by 13µs
10cm x 13 µs/cm = 130
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?
2cm
2cm x 13µs =26µs
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?
4cm
total distance is twice the depth of the reflector
depth =26µs/13µs=2cm
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?
doubles
PRP is directly related to imaging depth, if depth changes so does PRP proportionally
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?
it is halved
PRF is inversely related to depth of imaging, so if depth is changed PRF changes inversely and also proportionally
the imaging depth during an ultrasound exam is 10cm. The sonographer adjusts the imaging depth to 5cm.
What happens to the PRP?
it is halved
PRP is directly related to imaging depth
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
7.7 kHz
because the units are correct
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?
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
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?
7700 HZ
