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Determination of attenuating properties of the tissue from the echoes of waves emitted by the focused transducer requires to compensate the echo signal for the effects of focusing. We propose the diffraction/focusing effects correcting (FC) technique that compensates focusing-induced mean frequency shift (MFS) of the propagating pulse. The method corrects mean frequency estimates derived from echo...
New types of thick-film transducers (19 to 37 MHz), with integrated highly attenuating ceramic backing formed of porous PZT material and shaped to the required ROC, were developed. For this project, focused transducers (focal depth 8.8 mm) with two different compositions, based on Ferroperm Pz24 (InSensor TF2400) and Pz26 (In Sensor TF2100), with different dielectric constant were fabricated. The...
Coded transmission is an approach to solve the inherent compromise between penetration and resolution required in ultrasound imaging. It is widely acknowledged that this technique gives major improvement in SNR and enables higher contrast imaging without sacrificing the resolution. Our goal was to examine the applicability of the coded excitation to HF (20-30MHz) ultrasound imaging, especially in...
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