What medical imaging technique utilizes the frequency shift of reflected sound waves to evaluate blood velocity in cardiovascular vessels?
Answer and explanation
Correct answer: D. Doppler ultrasound
- Step 1: Moving red blood cells act as moving reflectors of sound. Step 2. By the Doppler effect, the frequency shift Delta f = 2 f v cos(theta) / c is directly proportional to blood flow velocity, enabling vascular assessment. Answer: Doppler ultrasound. Why not the others: B-mode provides static grayscale anatomical cross-sections; MRI uses radiofrequency and magnetic fields; CT uses X-rays.
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