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In high intensity focused ultrasound (HIFU) systems using non-ionizingmethods in cancer treatment, if the device is applied to the body externally,the HIFU beam can damage nearby healthy tissues and burn skin due to lack ofknowledge about the viscoelastic properties of patient tissue and failure toconsider the physical properties of tissue in treatment planning. Addressingthis problem by using various methods, such as MRI or ultrasound, elastographycan effectively measure visco-elastic properties of tissue and fits within thepattern of stimulation and total treatment planning. In this paper, in a linearpath of HIFU propagation, and by considering the smallest part of the path,including voxel with three mechanical elements of mass, spring and damper,which represents the properties of viscoelasticity of tissue, by creating wavesof HIFU in the wire environment of MATLAB mechanics and stimulating theseelements, pressure and heat transfer due to stimulation in the hypotheticalvoxel was obtained. Through the repeatability of these three-dimensionalelements, tissue is created. The measurement was performed on three layers. Thevalues of these elements for liver tissue and kidney of sheep in a practicalexample and outside the body are measured, and pressure and heat for threelayers of liver and kidney tissue of an organism were obtained by applyingultrasound signals with a designed model. This action is repeated in threedifferent directions, and the results are then compared with simulationsoftware for ultrasound, as a reference to U.S. Food and Drug Administration(FDA) measures for HIFU, as well as comparisons of results with an operationalmethod for an HIFU cell.

Modeling pressure distribution and heat in the body tissue and extract the relationship between them in order to improve treatment planning in HIFU