计算机科学 ›› 2015, Vol. 42 ›› Issue (10): 311-315.
栾方军,周佳鹏,曾子铭
LUAN Fang-jun, ZHOU Jia-peng and ZENG Zi-ming
摘要: 脑部核磁共振成像(MRI)是脑疾病临床诊断的重要手段,而脑组织的准确分割则是其中一个重要的环节。然而MRI图像中普遍存在的噪声和偏移场给脑组织的准确分割造成了很大的困难。在MRI图像分割算法中,偏移场矫正模糊C-均值算法(BCFCM)在模糊C-均值聚类算法(FCM)的基础上增加了对偏移场的估计和空间信息的使用,可以很好地消除图像偏移场对分割造成的影响。但是BCFCM算法由于没有考虑到噪声对偏移场估计的影响,因此对高噪声图像的分割效果欠佳。针对MRI脑组织分割,在图像预处理过程中提出一种快速的分割方法来去除颅骨及其附属物。此外,提出基于BCFCM的改进算法,该改进算法在迭代过程中可以通过对噪声强度的估计来自适应地改变目标函数窗口的大小。同时,该算法引入高斯核函数对偏移场进行平滑处理,并通过阈值限制偏移场的估计值,以有效地避免偏移场的错误估计对分割结果的影响。实验结果表明,改进后的算法不仅可以有效准确地 分割脑组织,而且具有较强的抗噪声和处理偏移场的能力。
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