Wavefront amplitude distribution in the female breast.
Wavefront amplitude distribution in the female breast.
复制标题
女性乳房的波前幅度分布。
DOI：
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发表时间：
1994
影响因子：
2.4
通讯作者：
B. Steinberg
中科院分区：
文献类型：
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作者：
Q. Zhu;B. Steinberg
对 3 和 4 MHz 频率下通过女性乳房传输的大量波前进行的超声测量表明，波前幅度分布接近瑞利。这一发现与完全发展的散射场一致，这意味着从相干入射光束中去除的散射能量在波前中占主导地位。从非均匀介质接收到的波前是入射波加上散射波的叠加。如果散射场较弱，则接收场以入射场为主，波前振幅分布呈莱斯分布。如果散射场较强，则接收场主要是散射场，波前幅度分布为瑞利分布。如果除了散射之外，不同折射率的物体之间还发生折射，则对波前幅度分布的总净效应与强散射相同。这就是我们在高折射女性乳房中观察到的情况。这一结果对于采用自适应相位去畸变算法的高横向分辨率回波扫描仪的设计具有重要意义。已发布的算法是针对弱散射而开发的，因此可能不够强大。必须找到替代方案来消除乳房中严重的波前畸变。
Ultrasound measurements of a large population of wavefronts transmitted through female breasts at 3 and 4 MHz show that the wavefront amplitude distribution is close to Rayleigh. This finding is consistent with a fully developed scatter field, implying that the scatter energy removed from the coherent incident beam dominates the wavefront. The wavefront received from an inhomogeneous medium is the superposition of an incident wave plus a scattered wave. If the scattered field is weak, the received field is dominated by the incident field and the wavefront amplitude distribution is Rician. If the scattered field is strong, the received field is primarily the scattered field and the wavefront amplitude distribution is Rayleigh. If, in addition to scattering, refraction between bodies of different refractive indexes occurs, the total net effect on the wavefront amplitude distribution is the same as for strong scattering. This is what we have observed in the highly refractive female breast. This result has implications for the design of high lateral-resolution echo scanners that will incorporate adaptive phase deaberration algorithms. The published algorithms were developed for weak scattering and therefore may not be powerful enough. Alternatives have to be found to deaberrate the severe wavefront distortion in the breast.