Question

question 11 of 25
how does doppler ultrasound technology differ from ultrasound technology that does not use the doppler effect?
a. doppler ultrasound creates images, but other ultrasound technology does not.
b. doppler ultrasound collects data from moving objects.
c. doppler ultrasound is based on absorption of sound, and other ultrasound technology is based on reflection.
d. other ultrasound technology creates images, but doppler ultrasound does not.

Explanation:

• Option A: Both Doppler and non - Doppler ultrasound create images. Non - Doppler ultrasound creates anatomical images, and Doppler ultrasound also creates images along with information about blood flow (which is related to moving objects). So this option is incorrect.
• Option B: The Doppler effect is used to measure the change in frequency of waves (in this case, ultrasound waves) due to the relative motion between the source (transducer) and the reflector (moving blood cells, for example). So Doppler ultrasound specifically collects data from moving objects (like blood flow in vessels), while non - Doppler ultrasound (like traditional B - mode ultrasound) is more about creating static anatomical images. This option is correct.
• Option C: Both Doppler and non - Doppler ultrasound are based on the reflection of sound waves. The key difference is the use of the Doppler effect (related to motion) in Doppler ultrasound. So this option is incorrect.
• Option D: Doppler ultrasound does create images (usually in combination with color or spectral displays to show flow information on top of or along with the anatomical image). Non - Doppler ultrasound creates anatomical images. So this option is incorrect.

Answer:

B. Doppler ultrasound collects data from moving objects.