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Evaluation of the therapeutic ultrasound immersion technique applied in phantom

The present work evaluate the heating pattern of therapeutic ultrasound using immersion technique in a phantom of fat tissue made of silicone in different distances. Five tests were performed in each of six positions: 0, 1, 2, 3, 5 and 10 cm apart from the transducer surface, at 1 MHz, continuous mode and effective intensity 1.05 W·cm-2 for 180s. In the most superficial thermocouple, there was decrease in the temperature from the distance 0 cm to 1 cm and the following distances (2, 3, 5 and 10 cm) also experienced reduction above 90% of the average value at 0 cm. In thermocouples 2, 3 and 4 there was no significant difference with increasing distance from the transducer to the phantom.