Ebbini E S, Cain C A
Bioacoustics Res. Lab., Illinois Univ., Urbana, IL.
IEEE Trans Ultrason Ferroelectr Freq Control. 1989;36(5):540-8. doi: 10.1109/58.31798.
A method for computing array element amplitude and phase distributions for direct synthesis of multiple-focus field patterns using ultrasonic phased arrays is shown to be capable of producing desired field levels at a set of control points in the treatment volume. The complex pressure at any of these control points can be chosen to produce the desired power deposition at the point, including reducing the field level to avoid potential hot spots, thus providing a powerful tool for hyperthermia treatment planning. The method also allows the complex excitation vector to be weighted to reduce the dynamic range of the driving signals without disturbing the relative field levels at the control points, allowing near maximum power transfer from the array into the treatment volume.
一种用于计算超声相控阵直接合成多焦点场模式的阵列元件幅度和相位分布的方法，被证明能够在治疗体积中的一组控制点处产生所需的场强。这些控制点中任一点处的复压力可被选择，以在该点产生所需的功率沉积，包括降低场强以避免潜在的热点，从而为热疗治疗计划提供了一个强大的工具。该方法还允许对复激励矢量进行加权，以减小驱动信号的动态范围，而不干扰控制点处的相对场强，从而使从阵列到治疗体积的功率传输接近最大值。
