Exam-style question
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Explain how acoustic impedance affects the reflection of ultrasound waves at tissue boundaries.
Model answer
What a good answer should say
- Acoustic impedance is the product of the density of a medium and the speed of sound in that medium.
- When ultrasound waves encounter a boundary between two tissues with different acoustic impedances, some of the waves are reflected back while others are transmitted.
- The greater the difference in acoustic impedance, the more significant the reflection.
Explanation
Why this works
This answer demonstrates an understanding of the concept of acoustic impedance and its role in ultrasound imaging. It tests the student's ability to connect physical principles to practical applications in medical imaging.
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