Finite element analysis of ultrasound thermal dose in shrinkage tumors inside human body

Abstract EN

In this work the thermal behavior of malignant and healthy human tissue while exposing to ultrasonic waves was studied.

Some stand-alone heat therapy is described numerically using Pennes equation which was solved using three level time step procedure to avoid iteration.

The efficient procedure of solving the equations by avoiding time consuming procedure of iteration was combined with band solver matrix solution enhanced the program efficiency (i.

e.

reduce the time of calculation and the size of the program) .

The temperature distribution was obtained first from which the thermal dose required to shrink a tumor was calculated using well-known thermal dose equations and then the zone that had been necroses was obtained where an effective procedure is proposed to shrink the cancer cells that may exist in certain human tissues.

The controlling of the heat dose is the main factor in determining the affected zone by chooses a suitable acoustic window, power and time.

The suitable heat can be generated with a human body so as to kill the cancer cells where they may exist.

Cancelling the heat source, the temperature of the skin was obtained numerically which was found with good agreement with real skin temperature.