CT结肠镜中的电子清肠:结肠增强滤波

Electronic Cleansing in CT Colonography:Colon Enhancement Filtering

针对由于口服对比剂的部分容积效应,使得电子清肠存在两种伪影:伪软组织和软组织退化的问题,利用结肠增强滤波来进行电子清肠.首先在确定初始标记物区域时,采用发射射线法,去除伪软组织;然后利用Hessian矩阵的特征值针对不同的结构表现不同的特性,构造结肠软组织增强函数,同时增强空气中和标记物中的软组织.实验表明,该方法能够减轻标记物中软组织退化,去除伪软组织,同时保存夹在标记物和空气之间的褶皱,与手动分割结果的重合率高达91.7%.

CT eolonoscopy plays an important role in the early detection of colon cancer. However, because of the partial volume effect of oral contrast agent, electronic cleansing approach tended to suffer from the artifacts of degradation of the soft-tissue structures and the pseudo soft- tissue structures. So, colon enhancement filtering was presented. Firstly, the pseudo soft-tissue was removed by using segment rays in determining initial tagging region phase, then the enhancement function for soft-tissue was constructured with eigenvalue signature of Hessian matrix to enhance the soft-tissue laoth in air and in the tagging regions. The experimental results show that this method can reduce the degradation of the soft-tissue, remove the pseudo soft-tissue and preserve thin folds sandwiched between air and tagging regions. The overlap between the results lay manual and the as-reported segmentations is up to 91.7 %.