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Developing tools to visualize urinary flow dynamics is important, because urinary hydrodynamics is known to have a causal relationship with urethral voiding dysfunction problems. Yet, the design of such an imaging technique is challenging as fine time resolution is essential to track urine passage that can traverse at >2m/s speeds. Previously, we have overcome the time resolvability challenge in...
This paper gives a review of the current state-of-the-art in ultrasound parallel acquisition systems for flow imaging using spherical and plane waves emissions. The imaging methods are explained along with the advantages of using these very fast and sensitive velocity estimators. These experimental systems are capable of acquiring thousands of images per second for fast moving flow as well as yielding...
Minimum variance beamformer has high potential in improving image quality through an adaptive apodization weight optimization approach, but its impact is conventionally limited to lateral resolution enhancements. Recently, we reported a high range resolution technique that applies minimum variance beamformer to the frequency components of the RF signal after a delay-and-sum process. The technique...
We demonstrate the scattering superlens using elastic scattering to obtain sub-diffraction resolution. Scattering from disordered nanoparticles enables to reconstruct the sub-wavelength image of the target through time-reversal and transmission matrix.
Two aperture parameters in minimum-variance (MV) beamforming have been reported to affect the output image quality and the computational load of the beamformer realization. We analyzed the image quality, image quality gain and GPU computing cost of various transducer receive aperture and all possible sub-aperture sizes, towards establishing a design rule for the two aperture parameters. The aperture...
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