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3D ultrasound (US) acquisition acquires volumetric images, thus alleviating a classical US imaging bottleneck that requires a highly-trained sonographer to operate the US probe. However, this opportunity has not been explored in practice, since 3D US machines are only suitable for hospital usage in terms of cost, size and power requirements. In this work we propose the first fully-digital, single-chip...
3D ultrasound, an emerging medical imaging technique that is presently only used in hospitals, has the potential to enable breakthrough telemedicine applications, provided that its cost and power dissipation can be minimized. In this paper, we present an FPGA architecture suitable for a portable medical 3D ultrasound device. We show an optimized design for the digital part of the imager, including...
In medical diagnosis, ultrasound (US) imaging is one of the most common, safe, and powerful techniques. Volumetric (3D) US is potentially very attractive, compared to 2D US, because it might enable telesonography - decoupling the local image acquisition, by an untrained person, and the diagnosis, by the trained sonographer, who can be remote. Unfortunately, current 3D systems are hospital-oriented,...
In this paper, a maximum power point tracking (MPPT) system for indoors photovoltaic transducers is presented. The proposed system is used in conjunction with a switching DC-DC boost converter that generates a 1.2 V output for the circuits of the ultra-low-power application. The MPPT tracks different illumination intensities through changing the input impedance of the boost converter. The open circuit...
This paper presents a muli-input multi-output battery-less energy harvesting system for microscale wireless sensor nodes that combines piezoelectric and photovoltaic energy sources. The system undergoes four states of operation to achieve two voltage levels at the output of 1.2V and 3V. It is a dual path system that uses a single inductor for both boost and buck converter. A maximum power point tracking...
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