提出了一种能准确分割与阿尔茨海默病相关的脑部区域的方法。首先,制作了最符合样本的模板;其次,在MR特征采集上,充分利用图像配准产生的形变场信息;接着,在处理PET图像时,先将其互配准到同一个体的MR图像上;最后,将提取出的各脑区特征用支持向量机分类。用全脑分类正确率为MR:0.8736,PET:0.9195,0.3MR+0.7PET:0.8621;灰质正确率为MR:0.8736,PET:0.9195,0.3MR+0.7PET:0.8621;双样本t检验正确率为MR:0.8391,PET:0.9195,0.3MR+0.7PET:0.8966。在用大脑皮层分区进行分类时,MR的内嗅区皮质正确率最高(0.8391),PET的楔前叶正确率最高(0.9195),0.3MR+0.7PET的内嗅区皮质正确率最高(0.9425)。试验结果表明该方法与现有方法相比,能更准确的区分轻度AD患者和正常老人,有助于AD疾病的预防及早期诊断。
A method which can accurate segment areas of the brain associated with Alzheiraer's disease is proposed. Firstly, a template which fits for all the samples is designed. Secondly, during the acquisition of MR features, we make full use of deformation field information from the registration of images. Then, in the processing of PET ima- ges, we pre-register them to the corresponding MR images. Finally, according to features of each cerebral area, the features are classified using support vector machine. The accuracy from the whole brain is: MR: 0. 8736, PET: 0.9195, 0.3 MR + 0.7PET: 0. 8621 ; from the gray matter is: MR: 0.8736, PET: 0.9195, 0.3MR + 0.7PET: 0. 8621 ; and from the two sample t-test is: MR: 0. 8391, PET: 0. 9195, 0.3MR +0.7PET: 0. 8966. When the classification is carried out using cerebral cortical areas, the highest image accuracy in entorhinal cortex of MR is 0. 8931, the highest image accuracy in preeuneus of PET is 0.9195, and the highest image accuracy in entorhinal cortex of 0.3MR + 0.7PET is 0. 9425. The experimental resuhs show that compared with existing methods, this method can distinguish mild AD patient and normal elder more accurately, and which will help to prevent and early diagnose AD.