Exam-style question
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For Sensitivity and frequency response, which option best uses acoustic impedance matching to answer this objective: Use decibel scale ideas qualitatively and quantitatively where appropriate.?.
- A.Use acoustic impedance matching: reflection at a tissue boundary, so the answer is anchored to impedance contrast.
- B.Use a clinical description only, without naming the measured physical signal.
- C.Assume all tissue produces the same detector response, so no useful contrast is formed.
- D.Ignore the limitation or safety factor and treat the method as risk-free.
Model answer
What a good answer should say
- The correct option is Use acoustic impedance matching: reflection at a tissue boundary, so the answer is anchored to impedance contrast.
Explanation
Why this works
It is correct because acoustic impedance matching gives a specific physical mechanism and connects the detector or image evidence to the objective. The other options are incorrect because they either avoid the measured signal, remove contrast or detection detail, or ignore a limitation that AQA medical physics answers should consider.
Common mistake
No common mistake is linked to this question yet.