中文摘要：

为了提高前列腺超声图像的分割精度,提出了一种基于改进主动形状模型的前列腺超声图像分割算法.首先,提取前列腺超声图像的特征集合,该特征集合由Gabor纹理特征和局部二值模式（LBP）特征组成.然后,通过利用k均值算法对提取的特征集合进行聚类分析,得到超声图像的聚类表示图.最后,在聚类表示图上应用ASM获取超声图像中前列腺的形状信息.结果表明,该算法可以准确地定位前列腺边界信息,与医生手动标记的前列腺轮廓相比,平均绝对距离仅为1.559 6 mm,戴斯相似度系数最高可达93.88%.利用超声图像的聚类表示图可以获得更加精确的前列腺轮廓信息,可用于海扶高聚焦超声（HIFU）手术中的精准导航.

英文摘要：

To improve the segmentation accuracy of prostate ultrasound images,a prostate ultrasound image segmentation algorithm based on the improved active shape model（ ASM） is proposed. First,the prostate ultrasound image feature set consising the Gabor features and the local binary pattern（ LBP） features is extracted. Then,the cluster analysis of the feature set is carried out by using the k-means algorithm to obtain the clustering representation of the ultrasound image. Finally,based on the clustering representation,the shape information of the prostate is obtained by ASM. The results showthat the proposed algorithm can precisely locate the prostate contour. Compared with the doctor delineation of the prostate,the mean absolute distance（ MAD） is only 1. 56 mm. The highest Dice similarity coefficient（ DSC） reaches 93. 88%. The segmentation based on the clustering representation of the ultrasound image can achieve more accuracy results and can be applied on precision navigation of high intensity focus ultrasound（ HIFU） clinical operation.