新型乳腺磁共振增强图像肿瘤区域的自动分割模型

乳腺磁共振增强图像上,乳腺癌主要有肿块型和非肿块型两种强化方式。由于乳腺肿瘤区域相对较小,肿块型和非肿块型之间形态学差异大,非肿块型自身差异性复杂,因而很难精确分割出乳腺肿瘤区域。针对这些问题,提出一套新颖的粗检测细分割的深度学习模型(YOLOv2+SegNet)。该模型在精准分割之前,首先运用YOLOv2网络在乳腺可能的肿瘤区域进行粗检测,从而得到大致可能的肿瘤区域;接下来在粗检测的基础上,针对检测到可能的肿瘤区域,运用SegNet网络进行精细分割,从而实现算法最优的性能。为了验证YOLOv2+SegNet模型的有效性,从医院采集的数据集中选取560张乳腺MRI增强图像作为训练和测试(其中训练和测试集分别为415张和145张乳腺MRI数据)。在实验的过程中,运用YOLOv2+SegNet模型,分别对乳腺肿块型、非肿块型、肿块和非肿块混合型3类MRI数据进行肿瘤区域自动分割的实验。实验结果表明:YOLOv2+SegNet模型和SegNet网络分割结果的Dice系数相比有约10%的提升,与传统的C-V模型、模糊C均值聚类、光谱映射主动轮廓模型以及深度模型U-net、DeepLab相比有更为明显的提升。

A Novel Automated Tumor Segmentation Model for Enhanced Breast MRI

Breast cancer can be mainly classified into two kinds: mass-like and non-mass-like on enhanced breast images. Owing to the small area of breast cancer, along with the huge difference between the shape of mass-like and non-mass-like and the self complexity of non-mass-like, it is hard to segment the accurate area of breast tumor. To solve these problems, this paper proposed a novel deep learning model of rough detection and fine segmentation. Before precise segmentation, rough detection for the cancer region was firstly processed for potential region of the tumor. On the basis of rough detection, we used SegNet for fine segmentation to achieve the best performance of the algorithm. In order to test the effectiveness of proposed method (YOLOv2+SegNet), we picked 560 magnetic resonance imaging (MRI) images of breast cance out of the dataset collected from the hospital for training and testing (415 images for training and 145 for testing). For more comprehensive analysis, experiments were set to analyze three different conditions, such as mass-like, non-mass-like and the mix of mass-like and non-mass-like. From the results, the established method improved 10% under each condition and improved a lot compared with the traditional C-V model, fuzzy C mean clustering, active contour model for spectral mapping and deep model of U-net or DeepLab.