Exam-style question
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Explain the role of acoustic impedance in the reflection of ultrasound waves at tissue boundaries.
Model answer
What a good answer should say
- Acoustic impedance is a measure of how much resistance an ultrasound wave encounters as it travels through different tissues.
- When ultrasound waves encounter a boundary between two tissues with different acoustic impedances, part of the wave is reflected back, which helps in creating an image of the internal structure.
Explanation
Why this works
This answer highlights the importance of acoustic impedance in ultrasound imaging, testing the student's ability to connect physical properties with practical applications in medical imaging. It shows a clear understanding of how reflection occurs at tissue boundaries.
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