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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Two-step hybrid virtual array ray (VAR) technique for focusing through the rib cage
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Two-step hybrid virtual array ray (VAR) technique for focusing through the rib cage

机译：两步混合虚拟阵列射线（VAR）技术可通过肋骨进行聚焦

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摘要

A new methodology for focusing ultrasonic beams noninvasively in the presence of the rib cage is investigated. This investigation is motivated by the need to employ high intensity focused ultrasound (HIFU) using phased array applicators for the treatment of liver tumors partially shadowed by the rib obstacles. This approach enables us to efficiently perform the ultrasound computational analysis and pattern synthesis in the interior region of the rib cage. The proposed technique consists of two main steps. First, a virtual array is introduced along the intercostal spacings between the solid ribs to generate the prespecified intensity levels at a set of control points within the target region. The second step involves the design of the actual feed array that induces the virtual sources between the intercostal spacings. This design optimization is carried out via the pseudo-inverse technique (minimum norm least squares solution) and by enforcing a constrained preconditioned pseudo-inverse method. The proposed procedure calculates the required primary sources (feed array) while maintaining minimal power deposition over the solid obstacles.
机译：研究了一种在肋骨笼存在下无创聚焦超声束的新方法。这项研究的动机是需要采用高强度聚焦超声（HIFU），并使用相控阵施加器来治疗部分被肋骨障碍物掩盖的肝肿瘤。这种方法使我们能够在肋骨保持架的内部区域高效地执行超声计算分析和模式合成。所提出的技术包括两个主要步骤。首先，沿着实心肋骨之间的肋间间距引入虚拟阵列，以在目标区域内的一组控制点处生成预定强度水平。第二步涉及实际进给阵列的设计，该阵列在肋间间距之间引入虚拟源。该设计优化是通过伪逆技术（最小范数最小二乘解）并通过实施约束的预处理伪逆方法来进行的。拟议的程序将计算所需的主要源（馈源阵列），同时在固体障碍物上保持最小的功率沉积。

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