SPI Review Questions

The width of the beam is dependent on what?

• Wavelength

• Depth

• Amplitude

• Frequency

Tags

NGSS.HS-PS4-1

I = P / area is what equation?

• Amplitude

• Frequency

• Power

• Intensity

Tags

NGSS.HS-PS4-5

The diameter of a disc shaped, unfocused piezoelectric crystal is 5 mm. Estimate the minimum lateral resolution of the system.

• 1mm

• 5mm

• 2.5mm

• 1cm

• HELP: The beam converges to its narrowest width which is half the width of the transducer.

Tags

NGSS.HS-PS4-1

In the image below, is the returned frequency higher or lower than the original frequency?

• Lower

• Color in an Ultrasound is unrelated to frequency

• The same

• Higher

• 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 _____ frequency. So the red color on the color scale displays objects moving towards the transducer. Therefore the frequency has to be _____ in the echo that returned.

Tags

NGSS.HS-PS4-1

When the length of a vessel is halved.

• Viscosity is doubled

• Resistance is doubled

• Resistance is halved.

• Velocity is halved

The beam is narrowest at what point?

• Near zone

• Fraunhofer zone

• Far field

• Focus

The area where the velocity is the highest.

• Within the center of the lumen

• At a bifurcation

• At the wall of the vessel

• Proximal to a stenosis

What is the term for the concentration of matter?

• Weight

• Mass

• Energy

• Density

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-7

The typical frame rate of an Ultrasound system is?

• Always 60 Hz

• Between 50 Hz and 400 Hz

• Between 5 Hz and 40 Hz

• Between 5 MHz and 40 MHz

Tags

NGSS.HS-PS4-1

This type of artifact causes an ultrasound reflection to be placed at an incorrect depth.

• Range ambiguity

• Lateral incertitude

• Longitudinal resolution

• Shadowing