Breathing-Mode Ceramic Element for Therapeutic Array Transducer

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概要

• 論文の詳細を見る

• A new concept of piezoceramic array transducer element using breathing mode has been proposed for therapeutic application. Finite element numerical simulation showed that a concave hemispherical piezoceramic shell with a diameter slightly larger than the wavelength in water is effective for obtaining good acoustic matching with water. A hemispherical piezoceramic element with an inner diameter of 4.0 mm and a thickness of 0.2--0.4 mm produced more than several times higher acoustic power output than a conventional thickness-mode element at the same drive voltage in the simulation. Its good acoustic matching with water is considered to be accomplished by the combined resonance with the spherical bulk of water half covered by the shell, because the resonance was very sensitive to the change in sound speed of the virtual material replacing water with the same acoustic impedance in simulation.

• 2011-07-25

著者

• Umemura Shin-ichiro

  Graduate School of Bioengineering, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

• Yoshizawa Shin

  Graduate School of Engineering, Tohoku University, Sendai 980-5879, Japan

• Otsu Kenji

  Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Japan

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• Phase Change Nanodroplets and Microbubbles Generated from Them as Sources of Chemically Active Cavitation
• Quantitative Measurement of Focused Ultrasound Pressure Field Using Subtraction Shadowgraph
• Breathing-Mode Ceramic Element for Therapeutic Array Transducer
• Staircase-Voltage Metal–Oxide–Semiconductor Field-Effect Transistor Driver Circuit for Therapeutic Ultrasound
• Sustaining Microbubbles Derived from Phase Change Nanodroplet by Low-Amplitude Ultrasound Exposure
• Acoustic Response of Microbubbles Derived from Phase-Change Nanodroplet
• Therapeutic Array Transducer Element Using Coresonance between Hemispherical Piezoceramic Shell and Water Sphere: Effect of Load Masses of Support and Electric Contact
• Enhancement of Localized Heating by Ultrasonically Induced Cavitation in High Intensity Focused Ultrasound Treatment
• Coagulation of Large Regions by Creating Multiple Cavitation Clouds for High Intensity Focused Ultrasound Treatment
• Efficient Generation of Cavitation Bubbles in Gel Phantom by Ultrasound Exposure with Negative-Followed by Positive-Peak-Pressure-Emphasized Waves
• Large Volume Coagulation Utilizing Multiple Cavitation Clouds Generated by Array Transducer Driven by 32 Channel Drive Circuits
• Optical Phase Contrast Mapping of Highly Focused Ultrasonic Fields
• Analysis of Temperature Rise Induced by High-Intensity Focused Ultrasound in Tissue-Mimicking Gel Considering Cavitation Bubbles
• Enhancement of Focused Ultrasound Treatment by Acoustically Generated Microbubbles
• Analysis of Temperature Rise Induced by High-Intensity Focused Ultrasound in Tissue-Mimicking Gel Considering Cavitation Bubbles

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