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Because of its high temporal resolution and safety, medical ultrasound (US) imaging technology is widely used as a guided modality in modern therapies and examinations, especially in human liver treatment. Thus, the precise motion estimation method of the moving target becomes a hot researching domain. In this paper, a new motion estimation method is proposed for liver vessel tracking using long-term...
In this paper, we propose a novel extended-field-ofview (EFOV) imaging algorithm based on the property of motion estimation in quaternion wavelet domain (QWD) for ultrasound images. Firstly, transform the ultrasound video frames into QWD from spatial domain, and the result consists of one magnitude and three phases. Secondly, use two phases to estimate the motion of image sequence derived from the...
This paper presents a new panoramic imaging algorithm. With the target being direct video data, it could be absolutely applied in the actual ultrasonic application. In order to reduce the computation, this paper chooses sampling frames from the video for panoramic imaging. Therefore, the algorithm is actually a cyclical sampling process. The loop includes five parts: sampling from video data, evaluation...
Weakening of the bones because of the progressive loss of bone mass is a potentially serious side effect of extended space flight and it is a disease that cannot make complete recovery after landing. The measurement, prevention and treatment of bone loss are indispensable for long-term space flight. Quantitative ultrasound (QUS) measurement is the only densitometry technologies of bone mineral density...
A high-frequency angled needle ultrasound transducer with an aperture size of 0.4 times 0.56 mm2 was fabricated using a lead zinc niobate-lead titanate (PZN-7%PT) single crystal as the active piezoelectric material. The single crystal was bonded to a conductive silver particle matching layer and a conductive epoxy backing material through direct contact curing. A parylene outer matching layer was...
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