Acoustic holography as a metrological tool for characterizing medical ultrasound sources and fields
Acoustic holography as a metrological tool for characterizing medical ultrasound sources and fields
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DOI：
10.1121/1.4928396
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发表时间：
2015-09-01
影响因子：
2.4
通讯作者：
Kreider, Wayne
中科院分区：
文献类型：
--
作者：
Sapozhnikov, Oleg A.;Tsysar, Sergey A.;Kreider, Wayne
声全息是一种强大的技术，用于表征超声源及其辐射场，能够量化源振动并减少所需的测量次数。这些能力越来越吸引人，以满足医疗超声测量标准，然而，相关的不确定性还没有得到系统的研究。在这里与全息表示的线性，连续波超声场的错误进行了研究。为了便于分析，明确定义误差度量，并提供了基于瑞利积分的全息制剂的详细描述。误差进行评估，一个典型的治疗超声源的模拟和物理实验与三个不同的超声源。模拟实验探讨了采样误差所引入的使用有限数量的测量，几何不确定性在实际位置的采集测量，和传播介质的属性的不确定性。结果表明，保持误差小于1%的理论可行性。物理实验中的典型误差要大一些，大约为百分之几;与模拟的比较为改进实验实施以减少这些误差提供了具体的指导方针。总的来说，结果表明，全息术可以成功地实现作为一个小的，可量化的误差的测量工具。(C)2015年美国声学学会。
Acoustic holography is a powerful technique for characterizing ultrasound sources and the fields they radiate, with the ability to quantify source vibrations and reduce the number of required measurements. These capabilities are increasingly appealing for meeting measurement standards in medical ultrasound; however, associated uncertainties have not been investigated systematically. Here errors associated with holographic representations of a linear, continuous-wave ultrasound field are studied. To facilitate the analysis, error metrics are defined explicitly, and a detailed description of a holography formulation based on the Rayleigh integral is provided. Errors are evaluated both for simulations of a typical therapeutic ultrasound source and for physical experiments with three different ultrasound sources. Simulated experiments explore sampling errors introduced by the use of a finite number of measurements, geometric uncertainties in the actual positions of acquired measurements, and uncertainties in the properties of the propagation medium. Results demonstrate the theoretical feasibility of keeping errors less than about 1%. Typical errors in physical experiments were somewhat larger, on the order of a few percent; comparison with simulations provides specific guidelines for improving the experimental implementation to reduce these errors. Overall, results suggest that holography can be implemented successfully as a metrological tool with small, quantifiable errors. (C) 2015 Acoustical Society of America.