Iranian Journal of Biomedical Engineering (IJBME)
نشریه علمی مهندسی پزشکی زیستی

Fast And Noninvasive Thermal Monitoring In Ultrasound Digital Images Using Optical Flow Method

Document Type : Full Research Paper

Authors

Bahram Momen Mehrabani 1
Mohammad Javad Abolhassani 2
Alireza Ahmadian 2
Javad Alirezaie 3

1 .Sc Graduated, Biomedical Engineering Group, Tehran University of Medical Sciences

2 Associate Professor, Medical Physics and Biomedical Engineering Department, Tehran University of Medical Sciences

3 Associate Professor, Dept. Electrical Engineering, Ryerson University

https://doi.org/10.22041/ijbme.2009.13407
Abstract
The main purpose of this work is introducing a novel method of temperature monitoring using B-Mode Ultrasound digital images. Thermal dependence of sound speed causes a virtual displacement of scatterer particles. The virtual displacement is computed using speckle tracking methods. Horn-Shunck algorithm was applied to a tissue mimicking phantom to measure the virtual displacement. A heating resistor was used in this phantom to generate temperature elevation. The DICOM ultrasound images were acquired using commercial SIMENES ultrasound imaging system with 10MHz linear probe. The accuracy of noninvasive temperature estimation was measured comparing with invasive temperature measurement. The phantom is warmed up to the 8. The mean error of temperature estimation was found to be 0.4°C and peak error 0.9°C. Fast temperature estimation can be achieved using Optical-Flow methods. This Method is a differential based motion estimation method that estimates displacement by calculating the optical pattern changes caused by movements between two frames. Noise sensitivity is the main infirmity of Horn-Schunck method.

Keywords

Temperature Estimation
Thermal Therapy
Ultrasound Images
Optical-Flow
Speed Of The Sound

Subjects

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  • Receive Date 26 June 2015

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