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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Thin-film sparse boundary array design for passive acoustic mapping during ultrasound therapy
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Thin-film sparse boundary array design for passive acoustic mapping during ultrasound therapy

机译：薄膜稀疏边界阵列设计，用于超声治疗过程中的无源声学映射

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摘要

A new 2-D hydrophone array for ultrasound therapy monitoring is presented, along with a novel algorithm for passive acoustic mapping using a sparse weighted aperture. The array is constructed using existing polyvinylidene fluoride (PVDF) ultrasound sensor technology, and is utilized for its broadband characteristics and its high receive sensitivity. For most 2-D arrays, high-resolution imagery is desired, which requires a large aperture at the cost of a large number of elements. The proposed array??s geometry is sparse, with elements only on the boundary of the rectangular aperture. The missing information from the interior is filled in using linear imaging techniques. After receiving acoustic emissions during ultrasound therapy, this algorithm applies an apodization to the sparse aperture to limit side lobes and then reconstructs acoustic activity with high spatiotemporal resolution. Experiments show verification of the theoretical point spread function, and cavitation maps in agar phantoms correspond closely to predicted areas, showing the validity of the array and methodology.
机译：提出了一种用于超声治疗监测的新型二维水听器阵列，以及使用稀疏加权孔径进行无源声学映射的新算法。该阵列使用现有的聚偏二氟乙烯（PVDF）超声传感器技术构建，并因其宽带特性和高接收灵敏度而得到利用。对于大多数2D阵列，需要高分辨率的图像，该图像需要较大的孔径，但要花费大量的元素。所提出的阵列的几何形状是稀疏的，仅在矩形孔的边界上具有元素。使用线性成像技术填补了内部缺少的信息。在超声治疗期间接收到声发射后，该算法将变迹应用于稀疏孔径以限制旁瓣，然后以高时空分辨率重建声活动。实验证明了理论上的点扩散函数的有效性，琼脂幻影中的空化图与预测区域紧密对应，显示了阵列和方法的有效性。

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