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Abstract Ultrasound 111 0.1 - 1 [’\’11 17. frequency range has several properties that fovor its use In localized hypertherl11io. Due 10 its short wavelength and favoroble absorption characterislics, ullrasonic energy can be focused into a sllloller version and achieve grealer depth of penetration than can microwave energy. I\s n result of rhis focusing ndvanlages, ultrasound is capable of crealing a lelllperalme rise in tUlllor deep inside the body which is 1110re uniform nnd conlrolloble 111 It comprises seven chaplers: The first chapler introduces on introduelion which shows the properties of sound, physicol principles of ullrrtsound, and the use of ullrasonic in medicine specially in delel’lnining Ihe acoustic charocterislies of biological tissues. The second chapler, discusses the clwraclerislics of transducers which convert cleclric;d energy In rnechanical energy depending on piezoeleelric effecl. I\lso. acousric pulse generalion and rhe charocteriSlic irnpedance and reson:lI1ce ore discussed. The third clwpler, includes Ihe fundarnentrtls of the finite difference method and its two coses implicit and explicit methods. I\lso the advantages and disadvanloges of Ihe Iwo methods and Ihe stabilily condirion are presented. The fomth chopter, includes the renection coefficient due 10 uJlrrtsouncl incidence on rt Irtyered mediulll. We assume three layers and five Irtyers rncdia for cxrtrnp!es. I\s rtn :1I1nlir”’;nn tJ,~ ,,:_ ••• _. __ . c<1n be determined by using the concept of the renection coefficient from a multi J<1yered medium shown in 1his cIwpter. The fifth clwpter, includes fin conclusion (Ire presented. |