Ibbini M S, Ebbini E S, Cain C A
Dept. of Electr. Eng., Jordan Univ. of Sci. and Technol., Irbid.
IEEE Trans Ultrason Ferroelectr Freq Control. 1990;37(6):491-500. doi: 10.1109/58.63104.
Computer simulations to demonstrate the possibility of heating small tumors by appropriately driving the electronic control circuitry of an nxn square-element ultrasonic phased array are conducted. The synthesis method consists of simultaneously focusing the ultrasonic beam at different points uniformly distributed along the tumor periphery and, hence, involves no scanning. It is demonstrated that by combining the multiple focusing feature with a new field phasing concept, typical undesired hot spots can be eliminated. The tissue thermal response to this heating modality is investigated by iteratively solving the three-dimensional steady-state bioheat equation. Temperature distributions associated with different directly synthesized power deposition patterns are simulated and discussed.
开展了计算机模拟，以证明通过适当地驱动一个nxn方形元件超声相控阵的电子控制电路来加热小肿瘤的可能性。合成方法包括同时将超声束聚焦在沿肿瘤周边均匀分布的不同点上，因此无需扫描。结果表明，通过将多重聚焦特性与一种新的场相位概念相结合，可以消除典型的不希望出现的热点。通过迭代求解三维稳态生物热方程，研究了组织对这种加热方式的热响应。模拟并讨论了与不同直接合成功率沉积模式相关的温度分布。
