The effect of focus splitting after propagation of focused ultrasound through a rib cage is investigated theoretically. It is shown that the mechanism of this effect is caused by the interference of waves from two or more spatially separated sources, such as intercostal spaces. Analytical estimates of the parameters of splitting are obtained, i.e., the number of foci, their amplitudes, diameter, and the distance between them, depending on the transducer parameters, as well as the dimensions of the rib cage and position of ribs relative to the radiator. Various configurations of the relative positioning of ribs and radiator are considered; it is shown which of them are the most effective for real surgical operations.

中文翻译：

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与通过肋骨笼传播聚焦超声相关的聚焦分裂。

从理论上研究了聚焦超声通过胸腔传播后焦点分裂的影响。结果表明，这种效应的机制是由来自两个或多个空间分离源（例如肋间空间）的波的干扰引起的。获得分裂参数的分析估计值，即焦点的数量、它们的振幅、直径和它们之间的距离，这取决于换能器参数，以及肋骨的尺寸和肋骨相对于肋骨的位置。散热器。考虑了加强筋和散热器相对定位的各种配置；它显示了其中哪些对于真正的外科手术最有效。