Free Ultrasound Physics Questions
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The diameter of a disc shaped, unfocused piezoelectric crystal is 5 mm. Estimate the minimum lateral resolution of the system.
Question 1 Explanation:
The beam converges to its narrowest width which is half the width of the transducer.
The beam is narrowest at what point?
When the length of a vessel is halved.
Resistance is halved.
Resistance is doubled.
Velocity is halved.
Viscosity is doubled.
This type of artifact causes an ultrasound reflection to be placed at an incorrect depth.
In the image below, is the returned frequency higher or lower than the original frequency?
Color in an Ultrasound is unrelated to frequency.
Question 5 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.
I = P / area is what equation?
Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. At what value does ultrasound begin?
Greater than 0.2 MHz
Greater than 20 kHz
Greater than 10 MHz
Greater than 20,000 kHz
What is the term for the concentration of matter?
The area where the velocity is the highest.
At a bifurcation.
Proximal to a stenosis.
Within the center of the lumen.
At the wall of the vessel.
The width of the beam is dependent on what?
The typical frame rate of an Ultrasound system is?
Always 60 Hz
Between 5 Hz and 40 Hz
Between 5 MHz and 40 MHz
Between 50 Hz and 400 Hz
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