Temperature Monitoring during Focused Ultrasound Treatment by Means of the Homodyned K Distribution
M. Byra, E. Kruglenko, B. Gambin and A. Nowicki
Department of Ultrasound, Institute of Fundamental Technological Research, Polish Academy of Sciences, A. Pawińskiego 5B, 02-106, Warsaw, Poland
Received: October 3, 2016; In final form: May 19, 2017
Full Text PDF
Temperature monitoring is essential for various medical treatments. In this work, we investigate the impact of temperature on backscattered ultrasound echo statistics during a high intensity focused ultrasound treatment. A tissue mimicking phantom was heated with a spherical ultrasonic transducer up to 56°C in order to imitate tissue necrosis. During the heating, an imaging scanner was used to acquire backscattered echoes from the heated region. These data was then modeled with the homodyned K distribution. We found that the best temperature indicator can be obtained by combining two parameters of the model, namely the backscattered echo mean intensity and the effective number of scatterers per resolution cell. Next, ultrasonic thermometer was designed and used to create a map of the temperature induced within the tissue phantom during the treatment.

DOI: 10.12693/APhysPolA.131.1525
PACS/topics: temperature monitoring, homodyned K distribution, focused ultrasound