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In this paper, we present a front-end integrated circuit (IC) for an ultrasound neurostimulation system, to be interfaced with a 16×16 2D CMUT array to realize an ultrasound field pattern (USFP) using quantized phases and amplitudes. The IC uses a pulse width modulation (PWM) technique with a three-level pulse to generate excitation signals having multi-level quantized amplitudes. For a programmable...
A recent study showed that focused ultrasound can noninvasively create neural response in the retina in a similar way to light stimulus. To implement such functionality, we developed an algorithm for a 2D transducer array to project an image to the retina as an ultrasound field pattern (USFP) in a previous study. In this work, we report a front-end integrated circuit (IC) for a 2D CMUT array that...
A transparent transducer array is desired in backward-mode photoacoustic imaging (PAI). CMUT technology is especially suitable for this application because of its wide bandwidth and a wide selection of processing materials. We have previously demonstrated a single-element CMUT with an ITO bottom electrode for improved transparency. The device showed 40% to 70% optical transmission from 700 nm to 900...
Dynamic receive beamforming (DRBF) is challenging for FPGA-based ultrasound (US) imaging because it is computationally intense. Work has been done to either simplify the delay calculation or precalculate the delays and store them on the FPGA. The former sacrifices image quality and the latter is challenged by limited memory resource. In this work, we report on the design of an US imaging system for...
Dynamic receive beamforming (DRBF) is challenging for field-programmable gate array (FPGA)-based ultrasound (US) imaging because it is computationally intense. Work has been done to either simplify the delay calculation or precalculate the delays and store them on the FPGA. The former sacrifices image quality and the latter is challenged by limited memory resource on the FPGA. In this work, we report...
Focused ultrasound (FUS) is emerging as a promising technology for neural stimulation. In this study, we demonstrate the algorithm and the frontend integrated circuit (IC) architecture design for an ultrasound-based noninvasive neural interface to the retina. A digital image is provided as the input to the system, and the system calculates the excitation signal for each element in a 2D transducer...
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