Due to ease of measurement, the transducer’s potential difference may be as an indicator of power delivery. The proposed fuzzy controller-integrated HIFU setup compatible with the PAI system is a feasible instrument in thermal therapy for ex vivo artificial tumors management.ĭuring HIFU therapy it is important that the electrical power delivered to the transducer is monitored to avoid under or over exposure, ensure patient safety and to protect the transducer itself. The PAI system with 532-nm laser excitation is also integrated to define the affected region before and after HIFU treatment. The embedded fuzzy logic controller using the thermal input from the thermocouple sensor precisely drives the target temperature during HIFU exposure to achieve the expectedly coagulating results. The system’s control interface is built based on a touch screen to create a companionable interaction for users. The electrical HIFU design is fabricated with changeable operating frequency and justified output power for resonating with different kinds of commercial transducers.
#Phase shifter vs simple delay portable#
The objective of this study is to design a therapeutic method combining a portable high intensity focused ultrasound (HIFU) design which is suitable for the laboratory environment and a tailored integrated photo-acoustic imaging (PAI) system for monitoring thermal treatment. The design includes a 12 bit 16 MHz floating Current/Voltage (I-V) measurement circuit to allow real-time high-side monitoring of the power delivered to the transducer allowing use with multi-element transducers. This study demonstrates a transformer-less, high power switched mode transmit transmitter based on Gallium-Nitride (GaN) transistors that is capable of delivering peak powers up to 1.8 kW at up to 600 Vpp, while operating at frequencies from DC to 5 MHz.
Real-time monitoring of power delivered can avoid damage to the transducer and injury to patients due to over treatment, and allow for precise control over the output power. Switched mode transmitters allow for a more compact drive system with higher efficiencies, with multi-level transmitters allowing control over the output power. A typical setup involves large inefficient linear power amplifiers to drive the transducer. The acoustic power delivered to a transducers focal region will determine the treated area, and due to safety concerns and intervening layers of attenuation, control of this output power is critical. To drive large single-element HIFU transducers, ultrasound transmitters capable of delivering high powers at relevant frequencies are required. High-Intensity Focused Ultrasound (HIFU) therapy provides a non-invasive technique with which to destroy cancerous tissue without using ionizing radiation. In simulations, a linear piezoelectrics was assumed. Finally, it was discovered that power loss frequency spectrum depends on the external acoustic load for this type of transducers. In this investigation it was found an optimal operation point where a remarkable power loss reduction may be obtained regarding excitations at the resonance or antiresonance frequencies. in real loading conditions for numerous applications.
Additionally, harmonic electric excitations of the device and a constant velocity of its front face were supposed, when it was acoustically coupled to air or water loads, i.e. This article presents a numerical investigation of power loss in a thickness-extensional mode piezoelectric transducer, excited at its fundamental resonance, and designed with the data compatible with a very-high mechanical quality factor ( Q m ) piezoceramic. However, more recently other operation points have been examined. In this context, fundamentally two frequencies have been profusely investigated to excite these transducers, namely the resonance and antiresonance ones. Power loss reduction in piezoelectric transducers has been attracting the attention of diverse researchers and the ultrasonic technology manufactures for years.
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