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Five 3-MHz Therapeutic Ultrasonic (TUS) devices with their respective transducers were employed to study the relationship between the transducer Effective Radiation Area (ERA) and the area of the thermal image generated by irradiating a thermochromic test body. The resulting relationship was linear, in agreement with previous work.
This paper presents a thermochromic test body to qualitative evaluate the Effective Radiation Area (ERA) of Therapeutic Ultrasound (TUS) devices. The thermal areas produced by three transducers are measured and compared to the ERA of the same transducers measured according to the IEC 61689 standard. A linear relationship was obtained between both kinds of areas suggesting that a quantitative relation...
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...
The present work describes a method for acquiring thermal images generated by physiotherapeutic ultrasonic beams along a phantom of fat tissue made of PVCP. Five tests were performed in three ultrasound equipments, transducers operating at 1 and 3 MHz and nominal intensity 1.0 W. cm-2, totalizing thirty infrared thermal images that were then evaluated on a PC-like microcomputer. The method seems to...
Perfusion quantification software commonly analyzes log-compressed video images provided by ultrasound systems. Compared to analysis of raw RF signals, errors in perfusion parameter estimates may be introduced, even when proper linearization is applied to reverse the log-compression. In this work, the effects of log-compression, demodulation, scan conversion and 8-bit quantization have been investigated,...
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