Phase-Insensitive Detection for Measurement of Backscattered Ultrasound
Phase-Insensitive Detection for Measurement of Backscattered Ultrasound
复制标题
用于测量反向散射超声波的相位不敏感检测
DOI：
10.1109/t-uffc.1986.26887
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
J.G. Miller
中科院分区：
文献类型：
--
作者：
P. Johnston;J.G. Miller
将使用相敏检测获得的非均匀体模中的后向散射测量结果与通过二维点状接收器伪阵列使用相不敏感检测获得的结果进行比较。相敏测量使用常规的13 mm直径的压电接收器在大约170”的散射角下进行。通过计算由伪阵列测量的超声能量的零阶二维空间矩，在相同的位置获得相位不敏感的测量。在所有站点的反向散射传递函数使用相位不敏感检测得到的幅度始终较大，并表现出较小的波动与频率比相应的相位敏感反向散射传递函数。相位敏感结果的空间平均提供了更平滑的反向散射传递函数，但不能恢复相位抵消造成的幅度损失。这些研究表明，相位不敏感检测是一种手段，以提高在非均匀介质中的后向散射测量的准确性。
Abshzct-The results of backscatter measurements in an inhomogeneous phantom obtained using phase-sensitive detection are compared with those obtained using phase-insensitive detection by means of a two-dimensional pseudo-array of point-like receivers. Phase-sensitive measurements were performed using a conventional 13-mm-diameter piezoelectric receiver at a scattering angle of approximately 170". Phase-insensitive measurements were obtained at the same sites by computing the zeroth-order two-dimensional spatial moment of the ultrasonic energy measured by a pseudo-array. At all sites the backscatter transfer function obtained using phase-insensitive detection was consistently larger in magnitude and exhibited smaller fluctuations with frequency than the corresponding phase-sensitive backscatter transfer function. Spatial averaging of the phase-sensitive results provided smoother backscatter transfer functions but could not recover the loss of magnitude resulting from phase-cancellation. These investigations suggest that phase-insensitive detection represents a means to improve the accuracy of backscatter measurements in inhomogeneous media.
来自超声波组织类介质的声学反向散射。
影响因子：
3.8
作者：
Insana,MF;Zagzebski,JA;Madsen,EL
通讯作者：
Madsen,EL