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Fast cardiac imaging using diverging waves (DW) is receiving much attention. Coherent compounding is important to keep spatial resolution and CNR acceptable. Two approaches have been presented in literature to do so: i) the full aperture of the probe is used and the virtual focus is moved along an arc centered at the center of the probe (ARC); ii) a sub-aperture is used and the virtual focus is linearly...
Coherence-based methods have been shown to improve image quality by suppressing spurious lobes. However, when imaging a diffuse medium, such methods lead to a high variance of speckle amplitudes (i.e. granular appearance) which could limit their applicability for direct clinical imaging. The granular pattern may however be beneficial for speckle tracking echocardiography (STE), given the higher contrast...
The transverse oscillation (TO) technique can improve the estimation of tissue motion perpendicular to the ultrasound beam direction. TOs can be introduced using plane wave (PW) insonification and bilobed Gaussian apodization (BA) on receive (abbreviated as PWTO). Furthermore, the TO frequency of PWTO can be doubled after a heterodyning demodulation process is performed (abbreviated as PWTO*). This...
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