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Accurate targeting is essential to ensure safety for high-intensity focused ultrasound (HIFU) treatment. Recently we developed an ultrasonography-guided high-intensity focused ultrasound (USgHIFU) system, in which the imaging probe is mounted into the central hole of spherical HIFU phased-array transducer for targeting and monitoring. An acrylic plate with two flat-head bolts is used for the assessment...
Emboli generated in cardiac surgery can result in many postoperative neurological complications. There are many methods to reduce the amount of emboli or to block them. Nevertheless, many of methods have limitation. In this study, ultrasonic radiation force generated by phased array ultrasound is used to block emboli and the blocking effect is evaluated. We do vivo experiment on eight pigs (40kg)...
Volumetric HIFU ablation has been implemented in clinical practice to create large thermal lesion while reducing treatment durations. However, it still takes several hours to cover the whole target using volumetric ablation. Multiple focus intensity patterns have been proved beneficial to create larger lesions. The feasibility of dual-focus scanning in volumetric ablation has been evaluated. Simulations...
The appearance of hyperecho is clinically considered as an indicator of tissue necrosis for ultrasonography-guided high-intensity focused ultrasound (USgHIFU). Nevertheless, there is unobservable hyperechoic change in the absence of cavitation or boiling during sonication. A quantitative analysis that could identify post-sonication change in the ultrasound image is proposed for the detection of HIFU-induced...
In this paper, we proposed a new speckle suppression method for medical ultrasound images based on contourlet transform. Modeling the speckle with Rayleigh distribution in logarithmically transformed ultrasound images, a maximum a posterior (MAP) estimator is applied for speckle reduction via manipulating the coefficients in contourlet domain. Experimental results show that while effectively suppress...
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