Temperature feedback based heating strategy for ultrasound thermal surgery

Phased array transducer has the ability to generate multiple-focus pattern by adjusting the driving signal of individual element of the array. For the treatment of large target volume, several multiple-focus pattern could be used by using temporal switching technique among these power patterns. Typically, to obtain a uniform thermal dose, properly adjust the power level within the target volume is important. In this study, we proposed a temperature feedback based heating strategy without the need of power level adjustment. Several parameters, such as the setting temperature, sonication time, power level and blood perfusion, may affect the final thermal dose. Simulation results show that setting temperature is the key parameter to determine the final thermal dose while the effects of blood perfusion could be neglected and the sonication time should be as short as possible. Small power level is not suggested because the resulting thermal dose would extended owing to the thermal conduction.