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← ScienceWhich mechanism causes increased destructive interference when an ultrasonic transducer array focuses on bone?
A)Frequency-dependent acoustic impedance mismatch✓
B)Increased piezoelectric crystal contamination
C)Uniform element electrical detuning
D)Harmonic signal demodulation error
💡 Explanation
Frequency-dependent acoustic impedance mismatch induces scattering and reflection of waves. This is due to variations in material properties, therefore less energy is transmitted through the bone, and more destructive interference occurs rather than constructive reinforcement because the impedance at that frequency severely reduces transmission.
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