本文采用自回归模型得到肝脏组织不同区域的超声结构散射频谱，并对其频谱特征进行了统计分析。
In this paper, the ultrasonic spectra of liver's structural scattering were obtained by using autoregressive model, and the spectral characteristics were analyzed statistically.
结果表明：计算值能够较好地拟合实测值，证明自重应力水平构造应力是形成地应力主要因素。根据回归分析结果，获得了整个工程区域岩体的地应力分布。
The regression output shows that the calculated stress match the measured data, also the gravity and horizontal tectonic stress are the main factors of the stress field in the project area.
结果表明：计算值能够较好地拟合实测值，证明自重应力水平构造应力是形成地应力主要因素。根据回归分析结果，获得了整个工程区域岩体的地应力分布。
The regression output shows that the calculated stress match the measured data, also the gravity and horizontal tectonic stress are the main factors of the stress field in the project area.
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