Quantitative measurement of focused ultrasound pressure field by background-subtracted shadowgraph using holographic diffuser as screen
Quantitative measurement of focused ultrasound pressure field by background-subtracted shadowgraph using holographic diffuser as screen
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DOI：
10.7567/jjap.53.07kf24
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发表时间：
2014-07
影响因子：
1.5
通讯作者：
R. Miyasaka;Jun Yasuda;M. Syahid;S. Yoshizawa;S. Umemura
中科院分区：
文献类型：
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作者：
R. Miyasaka;Jun Yasuda;M. Syahid;S. Yoshizawa;S. Umemura
在医学超声技术的发展中，快速准确的压力场测量是非常重要的。测量超声压力场最常用的方法是使用机械扫描水听器，这可能会干扰声场，而且需要很长的时间。在这项研究中，我们使用了光学阴影法。在利用阴影图进行定量测量时，精确地定义位相物体和成像平面之间的光传播长度是很重要的。为此，我们使用了全息漫射器作为成像屏幕。利用计算机层析成像(CT)算法重建压力场，并与水听器测量结果进行比较。通过组合传播长度较小和较大的两个阴影图结果，结果与水听器的结果非常接近，并成功地在非线性变形明显的压力范围内进行了重建。
In the development of medical ultrasound techniques, fast and accurate pressure field measurement is important. The most common method of measuring an ultrasound pressure field is by using a mechanically scanned hydrophone, which might disturb the acoustic field, and it takes a long time. In this study, we used an optical shadowgraph method. For quantitative measurement using the shadowgraph, it is important to define precisely the optical propagation length between the phase object and the imaging plane. We used a holographic diffuser as the imaging screen for this purpose. A computed tomography (CT) algorithm was used to reconstruct a pressure field, and the result was compared with that of hydrophone measurement. By combining two shadowgraph results from smaller and larger propagation lengths, the result was very close to that of the hydrophone and was successfully reconstructed in the pressure range where nonlinear deformation was clear.