Socrative Quiz Final Quiz

Question 1

Which of the following occurs as the scan line density decreases?

Answer 1

Interpolation

Question 2

Modern day ultrasound systems eliminate grating lobes in which of the following ways?

Answer 2

Electronically and mechanically

Question 3

Calculate the maximum frame rate if scanning to a depth of 10 cm, using a single focus and assuming there are 100 lines per frame.

Answer 3

77 frames per second

Frame rate formula = (77,000)/(LPF x Depth x No of foci)

LPF = lines per frame

Question 4

Which of the following is an assumption made by the ultrasound system?

1. The strength of the returning echo indicates the organ echogenicity only
2. Sound travels at a velocity related to compressibility and density
3. Reflector distance is dependent on the proximal tissue
4. Sound travels in a non linear fashion

Answer 4

The strength of the returning echo indicates the organ echogenicity

Question 5

This image displays areas of increased and decreased brightness as the result of several off axis reflections. Which of the following controls will improve this image?

Answer 5

Persistence

Question 6

Which of the following can produce a reverberation artifact?

1. Bones
2. Vessels
3. Gas
4. Stones
5. Metal

Answer 6

All of these are correct

Question 7

When scanning through ha lesion, the reflectors posterior to it appear closer to the probe than indicated on a comparable CT scan for the same patient. What does this tell the sonographer about the speed of sound through this lesion?

Answer 7

The speed of sound is faster than 1540 m/s

Question 8

Which artifact is demonstrated in this image?

Answer 8

Range ambiguity

Question 9

What is the cause of the artifact seen in this image?

Answer 9

Focal banding

Question 10

Which of the doppler shifts listed is the minimum value that will result in aliasing with a PRF of 10 kHz?

1. 3 kHz
2. 5 kHz
3. 6 kHz
4. 7 kHz

Answer 10

6 kHz

Question 11

Which of the following are used to eliminate doppler mirror image artifact?

1. Decrease doppler gain
2. Decrease incident angle
3. Scan more perpendicular
4. Decrease the sample volume size

Answer 11

1. Decreases doppler gain
2. Decrease incident angle