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Thermal Properties and Changes of Acoustic Parameters in an Egg White Phantom During Heating and Coagulation by High Intensity Focused Ultrasound by Gabriela Wilzbach Divkovic; Marko Liebler; Klaus Braun; Thomas Dreyer; Peter E. Huber; Jürgen W. Jenne is a Medicine article available to read on EtoBox.
What is Thermal Properties and Changes of Acoustic Parameters in an Egg White Phantom During Heating and Coagulation by High Intensity Focused Ultrasound about?
A polyacrylamide phantom containing egg white has been proposed previously as an adequate tissue-mimicking material for high intensity focused ultrasound (HIFU) application. In this work, we report on measurements of egg white phantom thermal conductivity and specific heat capacity. We measured changes in acoustical properties which occurred during the heating and the coagulation process. Using a thin thermocouple embedded in the phantom material, we recorded the temperature response in the focus of the ultrasound field during HIFU application and phantom coagulation. The measured values for the thermal conductivity (0.59 +/- 0.06 W/m/ degrees C) and the specific heat capacity (4270 +/- 365 J/kg/ degrees C) are similar to the values of water. The attenuation coefficient decreased in the temperature range between 26 degrees C and 50 degrees C and showed a nonlinear dependence on frequency with an exponent of 1.50 +/- 0.05 that was temperature-independent within the investigated temperature range. Below 65 degrees C, no irreversible changes in material absorption were observed. The coagulation process started at 67 degrees C and no adjacent rapid changes in temperature response were
Who reads Thermal Properties and Changes of Acoustic Parameters in an Egg White Phantom During Heating and Coagulation by High Intensity Focused Ultrasound?
It is typically read by researchers, students, and practitioners in Medicine.
- Author
- Gabriela Wilzbach Divkovic; Marko Liebler; Klaus Braun; Thomas Dreyer; Peter E. Huber; Jürgen W. Jenne
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0301-5629)
- Published
- 2007
- Language
- EN
- Field
- Medicine (Health Sciences)