目的：评价单球囊后凸成形术治疗骨质疏松性椎体压缩骨折的效果。

OBJECTIVE: To evaluate the therapeutic effect of single balloon kyphoplasty using extrapedicular approach in patients with osteoporotic vertebral compression fractures.

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本文首先提出了客观评价噪声压缩效果的两个指标：残余噪声能量和信号畸变指标。

This paper firstly presents two criteria: residual noise energy and signal distortion criterion to evaluate the degrees of noise suppression and signal distortion.

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应用小波变换对腹部MRI进行图像压缩与平滑化处理，应用边缘检测技术进行边缘数据与肝脏特征值的提取，并结合医师确定的肝脏区域进行图像分割效果的评价。

Wavelet transforms are used to compress image and smooth edge of liver region from abdomen MRI. The results of image segmentation are evaluated based on the liver region determined by doctor.

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