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Muscle activity can be used to generate control signals for prosthetic devices and human-assisting manipulators. Recently, a novel method has been developed to measure muscle movement using a flexible piezoelectric thin film sensor, which is made of oriented aluminum nitride (AlN) film. However, rigorous relationship between muscle activity and the sensor's output has not been clarified. As a preliminary...
This paper proposes a compensation for a blurred image caused by misregistration in spatial compounding. The edge sharpening based on morphological operations is applied to the compounded image. A portable measuring system of a cross-sectional ultrasound image is designed for measuring body composition. The system is developed for non-medical applications, for example, measurement of the volume of...
This paper proposes a new impedance estimation method for soft tissue using ultrasound. This method estimates the impedance distribution inside an object. An ultrasound probe, which is attached to a force sensor, compresses soft tissue and observes the deformation process of tissue while measuring reaction force. The impedance parameters are then estimated based on this information. Experiments were...
We have developed an ultrasonic probe with a film-type pressure sensor installed on its contact surface. The film-type pressure sensor, which uses aluminum nitride (AlN) as a piezoelectric material, is thin, flexible, durable and heat-resistant. The AlN is deposited on a polyimide film in high orientation using the sputtering method. The sensor can measure contact pressure directly, with little effect...
Ubiquitous echo is a portable ultrasound imaging equipment. We discuss an image sharpening method based on geometrical information by mathematical morphology with double structuring element (DSE) for on-line processing on ubiquitous echo. The sharpening method improves the contrast of tissue boundaries without speckle emphasis. The computational complexity of the morphological operations is reduced...
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