colour doppler artefacts

Question 1

Which of the following techniques are used to minimise aliasing on colour Doppler?

decreasing the colour Box

decreasing the transducer frequency

shifting the baseline

decreasing the colour gain

Answer 1

decreasing the colour Box

decreasing the transducer frequency

shifting the baseline

Question 2

High PRF mode is only a problem if additional sample volume land in an area with blood flow.

True

False

Answer 2

Correct Answer:
True

Question 3

Shadowing results in an increase in the strength of Doppler shift just beyond a highly attenuating structure.

True

False

Answer 3

Correct Answer:
False

Question 4

Which of the following colour Doppler artefacts can be useful in quantifying pathology?

shadowing

mirror

Aliasing

colour in the absence of flow

Answer 4

Aliasing

Question 5

Select all the statements that are true:

Require an interface with similar acoustic impedances

Duplication of structures with flow will result in duplication of the colour Doppler display

Result in a duplication of Doppler shift

Common examples are the duplication of vessels

Answer 5

Duplication of structures with flow will result in duplication of the colour Doppler display

Result in a duplication of Doppler shift

Common examples are the duplication of vessels

Question 6

Which of the following mechanism are responsible for mirror image artefacts on spectral Doppler?

Side lobes and grating lobes

Strong reflectors

Cross-talk

Perpendicular alignment

Answer 6

Strong reflectors

Cross-talk

Perpendicular alignment

Question 7

Beamwidth artefacts occur with 2D grey scale imaging and spectral Doppler imaging.

True

False

Answer 7

Correct Answer:
True