Free Ultrasound Physics Questions

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