Chapter 7 Flashcards
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The depth of the reflector in 10 cm in soft tissue. What is the go-return time?
130 us
Time of flight equals depth multiplied by 13 us.
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go-return time is 26 us. What is the depth of the reflector?
2 cm
2 cm x 13 us/cm=26 us
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go return time is 26 us. What is the total distance that the pulse traveled?
4 cm
Total distance traveled is twice the depth of the reflector.
The maximum imaging depth (depth of view) during an ultrasound exam is 10 cm. The sonographer adjusts the imaging depth to 20 cm. What happens to the pulse repetition period?
It is doubled.
PRP is directly related to imaging depth.
The maximum imaging depth during an ultrasound exam is 10 cm. The sonographer adjusts the imaging depth to 20 cm. What happens to pulse repetition frequency?
It is halved.
PRF is inversely related to imaging depth
The imaging depth during an ultrasound exam is 10 cm. The sonographer adjusts the imaging depth to 5 cm. What happens to 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 10 cm in soft tissue. What is the maximum PRF?
7.7 kHz
PRF= 77,000 cm/s divided by 10 cm
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The maximum imaging depth is 7.7 cm. What is the PRF?
10,000 Hz
77,000/7.7=10,000 Hz
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go-return time is 130 us. What is the maximum PRF?
7,700 Hz
When the depth of view is shallow, PRP is ________
Short
When the depth of view is deep, PRP is _________
Long
When the depth of view is deep, PRP is _________
Long
