Question 1

What principle does the Doppler effect rely on in ultrasound imaging?

Accepted Answer

The change in frequency of waves in relation to an observer moving relative to the wave source

Answer

The change in amplitude of waves due to reflection

Answer

The duration of the sound waves emitted by the source

Answer

The speed of sound being altered by temperature

Question 2

What is the primary clinical application of Doppler ultrasound?

Accepted Answer

Assessing blood flow and detecting abnormalities in blood vessels

Answer

Determining organ size

Answer

Visualizing bone structure

Answer

Measuring tissue density

Question 3

Which type of Doppler ultrasound is commonly used to measure the velocity of blood flow?

Accepted Answer

Continuous-wave Doppler

Answer

Spectral Doppler

Answer

Color Doppler

Answer

Pulsed-wave Doppler

Question 4

What effect does the Doppler shift have on the sound frequency during retrograde flow detection in blood vessels?

Accepted Answer

The frequency decreases

Answer

The frequency becomes erratic

Answer

The frequency increases

Answer

The frequency remains constant

Question 5

What is the purpose of using color Doppler ultrasound in medical imaging?

Accepted Answer

To visualize blood flow direction and velocity

Answer

To assess organ shapes

Answer

To measure tissue stiffness

Answer

To calculate body composition

Question 6

What role does the Nyquist limit play in Doppler ultrasound?

Accepted Answer

It determines the maximum measurable frequency shift without aliasing

Answer

It indicates the strength of the ultrasound beam

Answer

It measures the angle of incidence on the target

Answer

It is used to calculate the density of tissue

Question 7

What type of Doppler ultrasound provides information about both the direction and the speed of blood flow?

Accepted Answer

Color Doppler ultrasound

Answer

Pulsed-wave Doppler

Answer

Spectral Doppler ultrasound

Answer

Continuous-wave Doppler

Question 8

What happens during aliasing in Doppler ultrasound?

Accepted Answer

Higher frequency shifts are misrepresented as lower frequencies

Answer

The transducer cannot detect any sound waves

Answer

The machine displays static instead of signals

Answer

All frequencies are correctly represented

Question 9

What is the primary clinical application of Doppler ultrasound?

Accepted Answer

Assessing blood flow in vessels

Answer

Detecting bone density

Answer

Evaluating lung capacity

Answer

Measuring body temperature

Question 10

What causes the blue and red color coding in Doppler ultrasound images?

Accepted Answer

The direction of blood flow relative to the transducer

Answer

The type of ultrasound machine used

Answer

The temperature of the blood

Answer

The patient's age

Question 11

Which parameter is NOT typically measured in Doppler ultrasound assessments?

Accepted Answer

Tissue elasticity

Answer

Mean arterial pressure

Answer

Peak velocity

Answer

Volume flow rate

Question 12

In Doppler ultrasound, what does a high pitch sound indicate?

Accepted Answer

Higher speed of blood flow

Answer

Blockage in the vessel

Answer

Stable flow conditions

Answer

Lower speed of blood flow

Question 13

Which of the following parameters is typically assessed using Doppler ultrasound?

Accepted Answer

Peak systolic velocity

Answer

Bone length

Answer

Tissue stiffness

Answer

Organ volume

Question 14

What is the purpose of using sample volume in Doppler ultrasound?

Accepted Answer

To define the specific area of blood flow being measured

Answer

To increase image brightness

Answer

To enhance tissue contrast

Answer

To reduce scanning time

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