Field characterization of therapeutic ultrasound phased arrays through forward and backward planar projection
Field characterization of therapeutic ultrasound phased arrays through forward and backward planar projection
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DOI：
10.1121/1.429477
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Hynynen, K
中科院分区：
文献类型：
--
作者：
Clement, GT;Hynynen, K
空间平面投影技术将场测量从发射器前面的单个平面传播到更接近或更远离源的任意新平面：线性波矢量频域投影算法应用于从设计用于超声治疗的几个聚焦换能器阵列测量的声场。聚偏二氟乙烯水听器首先扫描在水箱中的平面上使用三维定位系统来测量作为位置的函数的复杂的压力场。然后使用该算法将场投影到一系列新平面。将投影场的结果与在相应距离处进行的直接测量结果进行比较。预测数据和实测数据之间存在良好的相关性。该方法被证明对于相位控制场图案的使用是准确的，为获得大空间体积上的场信息提供了一种快速而准确的方法。这种方法可以大大简化用于治疗的相控阵应用所需的表征过程。最重要的是，传播回相控阵列的波前可以用于预测由阵列元件的不同相位和振幅设置产生的场。在声学模拟中，将场反投影到源上可以作为改进的源函数。(C)2000年美国声学学会。【S0001-4966（00）01207-8】。
Spatial planar projection techniques propagate field measurements from a single plane in front of a transmitter to arbitrary new planes closer to or further away from the source: A linear wave vector frequency-domain projection algorithm is applied to the acoustic fields measured from several focused transducer arrays designed for ultrasound therapy. A polyvinylidene difluoride hydrophone is first scanned in a water tank over a plane using a three-dimensional positioning system to measure the complex pressure field as a function of position. The field is then projected to a series of new planes using the algorithm. Results of the projected fields are compared with direct measurements taken at corresponding distances. Excellent correlation is found between the projected and measured data. The method is shown to be accurate for use with phase-controlled field patterns, providing a rapid and accurate method for obtaining field information over a large spatial volume. This method can significantly simplify the characterization procedure required for phased-array application used for therapy. Most significantly, the wavefront propagated back to a phased array can be used to predict the field produced by different phase and amplitude settings of the array elements. A field back-projected to the source could be used as an improved source function in acoustic modeling. (C) 2000 Acoustical Society of America. [S0001-4966(00)01207-8].