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Abstract
The aim of this study was to evaluate the role of radicals as a mechanism of tissue damage induced by pulsed high-energy ultrasound. Transient cavitation has proved to be an important mechanism for the generation of reactive radical species during pulsed high-energy ultrasound applications. The amount of radicals studied in in vitro experiments using a chemical dosimeter based on iodine release is proportional to the number of pulses. Sonications of the R3327-AT1 subline of the Dunning prostate rat tumor transplanted in the thigh of Copenhagen rats were performed applying 500 and 2000 pulses at a pulse repetition frequency of 1 Hz. Tumor growth after treatment was compared with sham-treated controls. We were able to assess a significant growth delay, but could not find a significant difference between the two groups treated. In conclusion, radical formation does not seem to be the major mechanism for tissue necrosis induced by pulsed high-energy ultrasound.
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