Multifunctional pulse generator for high-intensity focused ultrasound system

Satoshi Tamano, Shin Yoshizawa, Shin-Ichiro Umemura
2017 Japanese Journal of Applied Physics  
High-intensity focused ultrasound (HIFU) can achieve high spatial resolution for the treatment of diseases. A major technical challenge in implementing a HIFU therapeutic system is to generate high-voltage high-current signals for effectively exciting a multichannel HIFU transducer at high efficiencies. In this paper, we present the development of a multifunctional multichannel generator/driver. The generator can produce a long burst as well as an extremely high-voltage short pulse of
more » ... pulse of pseudosinusoidal waves (trigger HIFU) and second-harmonic superimposed waves for HIFU transmission. The transmission timing, waveform, and frequency can be controlled using a field-programmable gate array (FPGA) via a universal serial bus (USB) microcontroller. The hardware is implemented in a compact printed circuit board. The test results of trigger HIFU reveal that the power consumption and the temperature rise of metal-oxide semiconductor field-effect transistors were reduced by 19.9% and 38.2°C, respectively, from the previous design. The highly flexible performance of the novel generator/driver is demonstrated in the generation of secondharmonic superimposed waves, which is useful for cavitation-enhanced HIFU treatment, although the previous design exhibited difficulty in generating it.
doi:10.7567/jjap.56.07jf21 fatcat:f2wdrkm64jcdfpm463xlafkhqq