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Second harmonic imaging relies on the double the transmit frequency being generated as the waves propagate into the tissue. The method requires good control over the transmit system, to suppress 2nd harmonics transmitted from the transducer. These transmitted harmonics may originate from both linear, e.g. sidebands in the transmit spectrum, and nonlinear effects in the transducer and transmitting...
Tissue harmonic imaging is often the preferred ultrasound imaging modality due to its ability to improve image quality by suppressing reverberations [1]. The method relies on the 2nd harmonic of the transmit frequency being generated as the waves propagation in tissue. For such imaging the backscattered harmonics are weak, so for successful imaging the level of undesired transmitted 2nd harmonic must...
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