The acoustoelectric interaction between an ultrasound wave propagating in a thin piezoelectric plate and an adjacent semiconductor results in a current that is proportional to the ultrasound intensity. These devices, inherently insensitive to the phase of the acoustic wavefront, can be used for large-area total power meters as well as spot intensity meters. They have broadband response and are capable of following the envelope of typical diagnostic imaging pulses. A previously derived model describing the interaction is reviewed. Experimental results obtained with several detectors are presented, including sensitivity and frequency response.
Laparompic ultrasound is anew surgical imaging method which goal of the development of ultrasound technology for surgery is ultrasound. This paper reviews a variety of issues related to provides direct contact imaging of organs with high frequency to break down this harrier through product design. protocol overall system design, transducers and arrays, and delivery development, and user training.systems. Laparoscopic ultrasound imaging system design addresses the requirements for high frequency, high resolution typically high frequency, fine pitch, low profile devices that can imaging in direct contact with tissue. Transducer arrays are be packaged in five and ten millimeter diameter delivery systems.accessories for guided biopsy and therapy. Results of recently Delivery systems include rigid and articulated probes with published clinical trials to evaluate performance of this modality used in laparoscopic cancer staging as compared to preoperative that compare laparoscopic ultrasound to cholangiography for diagnostic imaging will be discussed. Results of clinical trials detection of common bile duct stones will also be described.
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