الفهرس 
ULTRASOUND HYPERTHERMIA PHYSICSOnly 14 pages are availabe for public view
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Abstract
Ultrasound irradiation has become a promising therapeutic tool in cancer treatment since ultrasound
alone appears to selectively affect malignant cells without causing any deleterious effects to the
surrounding normal tissues. While, the frequencies employed in medical applications are in the
range between 500 kHz and 100 MHz, ultrasonic therapy frequencies are in the range between 0.15
and 3 MHz. Acoustic signals at these frequencies can be directed and coupled into body tissues
where they propagate at the speed of sound. While tra\ eling through the various tissues, the sound
waves undergo absorption, refracuon, reflection, and scattering, which depend on the acoustic
properties of the issues (density, speed of sound, absorption coefficient, and homogeneity) and the
changes in these properties at the tissue interfaces.
The main objective of this thesis is to develop a numerical simulation of the interaction of
therapeuttc ultrasound with a multi- tissue type system, and to develop an analytical model for
calculating the temperature nse produced by ultrasound in these tissues.
The Comsol software package employing the finite-element method (FEM) has been used to compute the
radiated power density produced by a circular ultrasonic transducer disk. the heat deposition in
each biological tissue and finally, the 2-8 temperature distribution during ultrasound hyperthermia
process.
Taken as a whole, this study provides a foundation for a better understanding of t1e interaction of
ultrasound with biological tissues and the usage of focused ultrasound as a therapeutic tool.