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Observation techniques for measuring the small vibration of a single microcapsule of tens of nanometers in an acoustic standing wave field are discussed. First, simultaneous optical observation of a microbubble vibration by two methods is investigated, using a high-speed video camera, which permits two-dimensional observation of the bubble vibration, and a laser Doppler vibrometer (LDV), which can...
100-MHz 32-array ultrasonic transducers using polyurea thin film are fabricated and tested experimentally in this paper. The polyurea film is prepared through vapor deposition polymerization, and miniature array electrodes are made with the use of lithographic techniques. Array transducers are prototyped in two different types of configurations. A resonant frequency of about 100 MHz was observed in...
The purpose of this study is to develop a new ultrasound diagnostic system for non-invasive and quantitative assessment of mechanical properties of the bone or bone healing. In the previous papers, we reported that we had developed a new ultrasound system to measure a minute bone deformation using a multi-point echo-tracking (ET) and that it had a great potential for non-invasive and quantitative...
In the previous paper, we reported that an ultrasound system using multi-point echo-tracking (ET) could have a great potential for non-invasive and quantitative diagnosis of bone healing. In this study, the results of a clinical evaluation of the previous method were reviewed and we further improved the ET system to obtain the higher accuracy. The objective of this study was to develop a new ultrasound...
To evaluate bone strength, it is significant to measure the degree of deformation or strain of bone under a certain load. However no method has been available to non-invasively measure bone deformation. To obtain bone mechanical properties such as elasticity, viscoelasticity and plasticity, we need to externally apply a load to a bone and to accurately measure the small displacement of a specific...
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