Yoichiro Matsumoto

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– Recently, lithotripsy (kidney stone treatment) using HIFU (High Intensity Focused Ultrasound) was developed by researchers in therapeutic ultrasound field. The lithotripsy crushes kidney stones powder, therefore, do not harm to the surrounding tissues of the kidney stones. However, it is necessary to continuously emit high intensity ultrasound waves on a(More)
A new method for fluoroscopic tracking of a proximal bone fragment in femoral fracture reduction is presented. The proposed method combines 2-D and 3-D image registration from single-view fluoroscopy with tracking of the head center position of the proximal femoral fragment to improve the accuracy of fluoroscopic registration without the need for repeated(More)
High intensity focused ultrasound (HIFU) is a promising technique for cancer treatment owing to its minimal invasiveness and safety. However, skin burn, long treatment time and incomplete ablation are main shortcomings of this method. This paper presents a novel HIFU robotic system for breast cancer treatment. The robot has 4 rotational degrees of freedom(More)
In the medical ultrasound field, microbubbles have recently been the subject of much interest. Controlling actively the effect of the microbubbles, a novel therapeutic method has been investigated. In this paper, our works on high intensity focused ultrasound (HIFU) lithotripsy with cavitating microbubbles are reviewed and the cavitation detection method to(More)
Cavitation occurs by the sudden expansion and the volumetric oscillation of bubble nuclei in the water due to the ambient pressure change. The size of bubble nuclei is O(10µm) and the thermal damping effects on the bubble motion is dominant in comparison with the acoustic and viscous damping effects. Because the thermal damping effect strongly depends on(More)