In harmonic imaging, the received echoes are at a frequency that is how related to the transmitted frequency?

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Multiple Choice

In harmonic imaging, the received echoes are at a frequency that is how related to the transmitted frequency?

Explanation:
In harmonic imaging, nonlinear propagation in tissue generates frequency components higher than the transmitted one. The most prominent of these is the second harmonic, which is exactly twice the transmitted frequency. The imaging system then filters to listen for this second-harmonic signal, which tends to improve image quality by reducing near-field clutter and taking advantage of the higher frequency for better resolution. So the received echoes are at twice the transmitted frequency.

In harmonic imaging, nonlinear propagation in tissue generates frequency components higher than the transmitted one. The most prominent of these is the second harmonic, which is exactly twice the transmitted frequency. The imaging system then filters to listen for this second-harmonic signal, which tends to improve image quality by reducing near-field clutter and taking advantage of the higher frequency for better resolution. So the received echoes are at twice the transmitted frequency.

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