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19 Cards in this Set

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To create an anatomic image, the transducer emits a ___ that travels to a ___ located in the body and then returns to the transducer
Sound Pulse
Reflector
The elapsed time from pulse creation to pulse reception is called what?
Go-Return Time
Time-of-Flight
What is the relationship between time of flight and depth?
Directly Related
Given the speed of sound through soft tissue, how do we calculate depth?
depth (mm) = (1.54mm/microseconds x go-return-time) / 2
What is the 13-microsecond rule?
For every 13 microseconds of go-return time, the reflector is 1 cm deeper
The PRP is the ___ of a sound pulse between the transducer and the bottom of the image
Go-Return Time
Time-of-Flight
What is the relationship between PRP and imaging depth?
Directly Related
How do we calculate PRP?
PRP (microsec) = depth (cm) x 13 (microsec/cm)
What is the relationship between PRF and imaging depth?
Inversely Related
How do we calculate PRF?
PRF (Hz) = 77000 (cm/s) / depth (cm)
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The depth of the reflector is 10 cm in soft tissue. What is the go-return time?
A. 13 microseconds
B. 1.3 microseconds
C. 65 microseconds
D. 130 microseconds
D
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go-return time is 26 microseconds. What is the depth of the reflector?
A. 1 cm
B. 2 cm
C. 3 cm
D. 4 cm
B
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go-return time is 26 microseconds. What is the total distance that the pulse traveled?
A. 1 cm
B. 2 cm
C. 3 cm
D. 4 cm
D
The maximum imaging depth is 10 cm. The imaging depth is adjusted to 20 cm. What happens to PRP?
A. it is unchanged
B. it is halved
C. it is doubled
D. it is 20x longer
C
The maximum imaging depth is 10 cm. The imaging depth is adjusted to 20 cm. What happens to PRF?
A. it is unchanged
B. it is halved
C. it is doubled
D. it is 20x longer
B
The maximum imaging depth is 10 cm. The imaging depth is adjusted to 5 cm. What happens to PRP?
A. it is unchanged
B. it is halved
C. it is doubled
D. it is 20x longer
B
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?
A. 7700
B. 7.7 kHz
C. 3500 Pa
D. 7700 microseconds
B
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?
A. 7700 Hz
B. 5000 kHz
C. 10000 Hz
D. 100 microseconds
C
A sound wave is created by a transducer, reflects off an object and returns to the transducer. The go-return time is 130 microseconds. What is the maximum PRF?
A. 7700 Hz
B. 5000 kHz
C. 10 cm
D. 100 microseconds
A