Comprehensive and Detailed Explanation From Exact Extract:
The matching layer is placed in front of the piezoelectric element and serves to reduce the difference in acoustic impedance between the transducer and human tissue, thereby improving sound transmission and minimizing reflection at the interface.
According to sonography instrumentation reference:
“The matching layer minimizes impedance mismatch between the transducer and soft tissue, allowing more efficient transmission of ultrasound energy into the patient.”
Therefore, the correct answer is D: Matching Layer.
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