Experimental Investigations of Viscous Heating Effect of Thermocouples under Focused Ultrasound Applications


Karaboce B., Cetin E., Durmus H. O. , Ozdingis M., KORKMAZ H. , Altun J., ...More

12th IEEE International Symposium on Medical Measurements and Applications (MeMeA), Minnesota, United States Of America, 7 - 10 May 2017, pp.88-93 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Minnesota
  • Country: United States Of America
  • Page Numbers: pp.88-93

Abstract

Realization of temperature characterization on focused ultrasound treatment devices by using tissue-mimicking phantom systems (Tissue-Mimicking Material, TMM) is indispensible in pre-clinical studies. In this survey, in order to examine the viscous heating effect of thermocouples, temperature rise due to excitation of a HIFU transducer has been measured by using two different types of T-type thermocouples embedded inside the TMM. In order to obtain the temperature values from the thermocouples more effectively, a PC-based multi-channel data acquisition and monitoring interface were developed by using LabVIEW graphical development platform. Measurements were carried out inside a TMM which has characteristics like human liver tissue. Temperature rise has been characterized for the different input ultrasonic powers (25 W, 38 W and 50 W) and frequencies (1,1 MHz and 3.3 MHz) and the time intervals applied (1 s, 2 s and 3 s). The temperature values obtained from two different types of T-type thermocouple were compared to each other and discrepancies between these two different thermocouple measurements were shown with the study.