1B43 FDTD法による振動板を用いた超音波圧力伝搬の基礎検討

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  • 1B43 Basic Study of Ultrasonic Wave Propagation with Vibration Plate by FDTD Method

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In recent years, High Intensity Focused Ultrasound (HIFU) has attracted attention as a treatment for cancers using focused ultrasound. In this treatment, ultrasound is irradiated from outside the body part to be focused on the target in the body, and kill cancerous tissue by thermal energy generated at the focal point. However, in order to carry out the treatment at a high temperature, there is a possibility that cauterizing also the normal tissue surrounding the tumor. Also, small HIFU devices have been developed, because large HIFU device expensive and large. But, so transducers are used to it is small, there is a disadvantage that its focal distance is short. In this study, we propose a control method of heating position with the vibration plate shape. Here, we propose the heating position control method of treatment according to the tumor location First, we presented a ring-shaped transducer model with the vibration plate for computer simulations. Second, we calculated pressure distributions from computer simulation using the Finite-Difference Time-Domain (FDTD) method. From these results, we found that the proposed control method was useful for HIFU.

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