The generator, thermometry system, computer, and applicators are located inside the treatment room, while the monitor and system control are located at the control console. Methods and Materials: An existing clinical ultrasound system has been modified for simultaneous operation with a 60 Co teletherapy machine. The system is being used to investigate the potential for increased biological benefit of simultaneously combined hyperthermia and external beam irradiation with currently achievable temperature distributions. Purpose: An existing ultrasound system has been adapted for simultaneous use with external photon beam irradiation.
International Nuclear Information System (INIS) All rights reserved.Īn ultrasound system for simultaneous ultrasound hyperthermia and photon beam irradiation It was therefore possible to propose a better understanding of heat transfer enhancement mechanism with high frequency ultrasound. At least, Particle Image Velocimetry (PIV) measurements have been performed in order to investigate hydrodynamic modifications due to the presence of 2 MHz ultrasound. In the same time cavitational activity due to 2 MHz ultrasound emission was characterized from mechanical and chemical viewpoints without significant results. Therefore, heat transfer enhancement factor ranges from 25% up to 90% for the same energy conditions (supplied ultrasonic power=110W and supplied thermal power=450W).
Heat transfer coefficient under ultrasound remains constant while heat transfer coefficient under silent conditions increases with Reynolds number from 900 up to 5000. The thermal approach allows to observe the increase of local convective heat transfer coefficients in the presence of ultrasound and to deduce a correlation between ultrasound power and Nusselt number. The present work focuses on possible heat transfer enhancement from a heating plate towards tap water in forced convection by means of 2 MHz ultrasound. Heat transfer enhancement using 2 MHz ultrasound.īulliard-Sauret, Odin Ferrouillat, Sebastien Vignal, Laure Memponteil, Alain Gondrexon, Nicolas The experimental results at KSRS accelerators are discussed. In accelerating structures, real high power operation modes of structure can be studied by outer ultrasound monitors. Noise protected instrumentation provides ultrasound spectra analysis in a wide frequency range up to 5 MHz.In circular accelerators, ultrasound fields in conducting walls of beam pipe represent the space-time characteristics of circulating beams. Sensitive elements and electronics for ultrasound measurements at conducting walls of beam pipes and accelerating structures are described. Ultrasound Instrumentation for Beam Diagnostics and Accelerating Structures Control
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