Free Ultrasound Physics Questions

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Question 1
What is the term for the concentration of matter?
A
Mass
B
Density
C
Weight
D
Energy
Question 2
I = P / area is what equation?
A
Power
B
Amplitude
C
Frequency
D
Intensity
Question 3
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 20,000 kHz
B
Greater than 20 kHz
C
Greater than 10 MHz
D
Greater than 0.2 MHz
Question 4
The beam is narrowest at what point?
A
Focus
B
Fraunhofer zone
C
Near field
D
Far field
Question 5
When the length of a vessel is halved.
A
Viscosity is doubled.
B
Resistance is doubled.
C
Velocity is halved.
D
Resistance is halved.
Question 6
The typical frame rate of an Ultrasound system is?
A
Between 5 Hz and 40 Hz
B
Between 50 Hz and 400 Hz
C
Always 60 Hz
D
Between 5 MHz and 40 MHz
Question 7
This type of artifact causes an ultrasound reflection to be placed at an incorrect depth.
A
Longitudinal resolution
B
Shadowing
C
Lateral incertitude
D
Range ambiguity
Question 8
The diameter of a disc shaped, unfocused piezoelectric crystal is 5 mm. Estimate the minimum lateral resolution of the system.
A
1 mm
B
1 cm
C
5 mm
D
2.5 mm
Question 8 Explanation: 
The beam converges to its narrowest width which is half the width of the transducer.
Question 9
The area where the velocity is the highest.
A
Proximal to a stenosis.
B
At a bifurcation.
C
Within the center of the lumen.
D
At the wall of the vessel.
Question 10
In the image below, is the returned frequency higher or lower than the original frequency?Carotid Ultrasound Flow Practice Question
A
Higher
B
Color in an Ultrasound is unrelated to frequency.
C
The same
D
Lower
Question 10 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 11
The width of the beam is dependent on what?
A
Wavelength
B
Depth
C
Amplitude
D
Frequency
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