双频相控阵超声热疗场共轭直接合成方法的理论研究

为了达到适合肿瘤治疗的空间能量分布,首次提出了用两个频率信号同时驱动超声相控阵的方法.采用逆向求解驱动信号作为约束条件和能量集中于肿瘤作为优化的目标函数并进行叠加,可以设置出适合肿瘤热疗的声场能量.文中还给出了双频应用于矩形相控阵的优化声强分布和其相应的驱动信号.

A Study of the Field Conjugation Method for Direct Synthesis of Two-frequency Phased-array Ultrasound Hyperthermia

In order to tailor the ultrasound distributions to deep and sized tumors, a new method of two frequency signals simultaneously driving phased array elements is firstly proposed in this paper. Two requirements should be met in method of field conjugation with direct synthesis; One is the use of the pseudo inverse method to compute element amplitude and phase driving distributions as a constraint condition; the other is the objective function to concentrate the energy to the sites. The paper also illustrates the field patterns of two frequencies driving to the rectangular sources.