Modeling Breast Ultrasound on the Applicability of Commonly Made Approximations
Modeling Breast Ultrasound on the Applicability of Commonly Made Approximations
复制标题
根据常用近似值的适用性对乳房超声进行建模
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
K. V. Dongen
中科院分区：
文献类型：
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作者：
Ulas Taskin;N. Ozmen;H. Gemmeke;K. V. Dongen
为了设计乳腺超声扫描系统或测试新的成像方法，各种计算机模型被用来模拟通过乳房的声波场传播。根据所应用的近似，计算机模型的复杂性各不相同。本文的目的是研究所应用的近似如何影响所产生的波场。特别是，我们研究了考虑可压缩性、质量体积密度和衰减的三维(3-D)空间变化的重要性。此外，我们还比较了四种三维求解方法：全波法、Born近似法、抛物线近似法和射线法。结果表明，在频率小于1 MHz的情况下，可压缩性对比物或密度对比物的散射场的幅度至少比衰减对比物的散射场的幅度高出24分贝。结果还表明，仅考虑声速作为对比是一种有效的近似。此外，全波方法模拟的压力场比其他三种方法模拟的压力场精度更高。最后，全波法的精度与位置无关，而其他方法的精度强烈地依赖于观测点。
To design breast ultrasound scanning systems or to test new imaging methods, various computer models are used to simulate the acoustic wave field propagation through a breast. The computer models vary in complexity depending on the applied approximations. The objective of this paper is to investigate how the applied approximations affect the resulting wave field. In particular, we investigate the importance of taking three-dimensional (3-D) spatial variations in the compressibility, volume density of mass, and attenuation into account. In addition, we compare four 3-D solution methods: a full-wave method, a Born approximation method, a parabolic approximation method, and a ray-based method. Results show that, for frequencies below 1 MHz, the amplitude of the fields scattering off the compressibility or density contrasts are at least 24 dB higher than the amplitude of the fields scattering off the attenuation contrasts. The results also show that considering only speed of sound as a contrast is a valid approximation. In addition, it is shown that the pressure field modeled with the full-wave method is more accurate than the fields modeled using the other three methods. Finally, the accuracy of the full-wave method is location independent whereas the accuracy of the other methods strongly depends on the point of observation.
影响因子：
3.8
作者：
Duric, Nebojsa;Littrup, Peter;Glide, Carri
通讯作者：
Glide, Carri