Free Ultrasound Physics Questions

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