Free Ultrasound Physics Questions

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Question 1
In the image below, is the returned frequency higher or lower than the original frequency?Carotid Ultrasound Flow Practice Question
A
Color in an Ultrasound is unrelated to frequency.
B
Higher
C
The same
D
Lower
Question 1 Explanation: 
This image illustrates how doppler is used to determine direction. Remember the example of the waves emitting from a car horn. If the object is moving towards the listener then the waves are compressed and it creates a higher frequency. So the red color on the color scale displays objects moving towards the transducer. Therefore the frequency has to be higher in the echo that returned.
Question 2
The beam is narrowest at what point?
A
Fraunhofer zone
B
Far field
C
Near field
D
Focus
Question 3
The typical frame rate of an Ultrasound system is?
A
Between 5 Hz and 40 Hz
B
Between 5 MHz and 40 MHz
C
Always 60 Hz
D
Between 50 Hz and 400 Hz
Question 4
I = P / area is what equation?
A
Intensity
B
Amplitude
C
Frequency
D
Power
Question 5
The width of the beam is dependent on what?
A
Wavelength
B
Frequency
C
Amplitude
D
Depth
Question 6
The diameter of a disc shaped, unfocused piezoelectric crystal is 5 mm. Estimate the minimum lateral resolution of the system.
A
2.5 mm
B
1 cm
C
5 mm
D
1 mm
Question 6 Explanation: 
The beam converges to its narrowest width which is half the width of the transducer.
Question 7
This type of artifact causes an ultrasound reflection to be placed at an incorrect depth.
A
Lateral incertitude
B
Range ambiguity
C
Longitudinal resolution
D
Shadowing
Question 8
The area where the velocity is the highest.
A
Within the center of the lumen.
B
At a bifurcation.
C
At the wall of the vessel.
D
Proximal to a stenosis.
Question 9
What is the term for the concentration of matter?
A
Density
B
Weight
C
Mass
D
Energy
Question 10
Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. At what value does ultrasound begin?
A
Greater than 0.2 MHz
B
Greater than 20 kHz
C
Greater than 10 MHz
D
Greater than 20,000 kHz
Question 11
When the length of a vessel is halved.
A
Viscosity is doubled.
B
Velocity is halved.
C
Resistance is halved.
D
Resistance is doubled.
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