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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Iterative reconstruction of the transducer surface velocity
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Iterative reconstruction of the transducer surface velocity

机译：换能器表面速度的迭代重建

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摘要

Ultrasound arrays used for medical imaging consist of many elements placed closely together. Ideally, each element vibrates independently. However, because of mechanical coupling, crosstalk between neighboring elements may occur. To quantify the amount of crosstalk, the transducer velocity distribution should be measured. In this work, a method is presented to reconstruct the velocity distribution from far-field pressure field measurements acquired over an arbitrary surface. The distribution is retrieved from the measurements by solving an integral equation, derived from the Rayleigh integral of the first kind, using a conjugate gradient inversion scheme. This approach has the advantages that it allows for arbitrary transducer and pressure field measurement geometries, as well as the application of regularization techniques. Numerical experiments show that measuring the pressure field along a hemisphere enclosing the transducer yields significantly more accurate reconstructions than measuring along a parallel plane. In addition, it is shown that an increase in accuracy is achieved when the assumption is made that all points on the transducer surface vibrate in phase. Finally, the method has been tested on an actual transducer with an active element of 700 ?? 200 ;C;m which operates at a center frequency of 12.2 MHz. For this transducer, the velocity distribution has been reconstructed accurately to within 50 ??m precision from pressure measurements at a distance of 1.98 mm (=16;B;0) using a 200-;C;m-diameter needle hydrophone.
机译：用于医学成像的超声阵列由紧密放置在一起的许多元素组成。理想情况下，每个元素都独立振动。但是，由于机械耦合，相邻元件之间可能会发生串扰。为了量化串扰量，应测量换能器速度分布。在这项工作中，提出了一种从任意表面上获取的远场压力场测量值重建速度分布的方法。通过使用共轭梯度反演方案求解从第一类瑞利积分中导出的积分方程，可以从测量中获取分布。这种方法的优势在于，它允许任意换能器和压力场测量几何形状以及正则化技术的应用。数值实验表明，与围绕平行平面进行测量相比，沿围绕换能器的半球测量压力场可显着提高重建精度。另外，示出了当假设换能器表面上的所有点同相振动时，实现了精度的提高。最后，该方法已在具有700Ω有源元件的实际传感器上进行了测试。 200; C; m，其中心频率为12.2 MHz。对于此换能器，速度分布已使用200-; C; m直径的针式水听器从1.98毫米（= 16; B; 0）的距离处的压力测量结果精确地重建到50 ?? m以内。

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