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波形分集方法可以用于优化超声相控阵列的声能沉积分布。本文阐述了波形分集方法用于超声热疗的声学理论背景,将发送声波时间内目标区域的声能沉积看作是不同位置的单焦点能量按一定时间规律累积的结果,提出了基于单焦点扫描的波形分集方法。该方法将声能沉积分布的优化问题建模为线性规划问题,可以方便求解出各单焦点扫描时间的比例系数,用于设计发射波形。与已有的方法相比,该方法对应的物理实现过程更清晰,计算量更小,并可直接综合出满足恒模条件的发射波形。从仿真结果中看到,该方法可将声场能量均匀的集中在预定区域,并在该区域外保持较低的能量沉积,能有效优化声能沉积的分布。
The waveform diversity method can be used to optimize the acoustic energy deposition distribution of an ultrasound phased array. In this paper, the acoustic theory background of waveform diversity for hyperthermic hyperthermia is described. The acoustic energy deposition in the target region within the time of sending acoustic waves is regarded as the result of the accumulation of single-focal energy at different positions over a certain period of time. A single-focus scanning Waveform diversity method. In this method, the optimization problem of acoustic energy deposition distribution is modeled as a linear programming problem, and the scale factor of each single-focus scanning time can be easily obtained for the design of the emission waveform. Compared with the existing methods, the corresponding physical realization process of the method is clearer and the calculation amount is smaller, and the transmission waveform meeting the constant mode condition can be directly synthesized. From the simulation results, we can see that this method can uniformly concentrate the sound field energy in a predetermined area and maintain a lower energy deposition outside the area, which can effectively optimize the distribution of acoustic energy deposition.