激光与光电子学进展, 2018, 55 (5): 051006, 网络出版: 2018-09-11   

二维和三维卷积神经网络相结合的CT图像肺结节检测方法 下载: 2866次

Detection of Pulmonary Nodules CT Images Combined with Two-Dimensional and Three-Dimensional Convolution Neural Networks
作者单位
江南大学物联网工程学院, 江苏 无锡 214122
摘要
针对现有方法在大量肺部数据中存在的检测肺结节效率不高及大量假阳性的问题,提出了一种基于端到端的二维全卷积对象定位网络(2D FCN)与三维立体式目标分类卷积神经网络(3D CNN)相结合的肺结节检测方法。首先采用2D全卷积神经网络对所有CT图像进行初步检测,快速识别和定位CT图像中的疑似结节区域,输出一张与原图尺寸相同且被标记好的图像。然后计算疑似结节区域的坐标,根据坐标值提取疑似结节的三维立体图像块训练构建的3D卷积神经网络框架。最后利用训练的3D模型对候选结节做二分类处理以去除假阳性。在LIDC-IDRI数据集上,结节初步检测召回率在平均每位患者为36.2个假阳性时可达98.2%;在假阳性去除之后,假阳性为1和4时分别达到了87.3%和97.0%的准确率。LIDC-IDRI数据库上的实验结果表明,所提方法对三维CT图像的肺结节检测具有更高的适用性,取得了较高的召回率和准确率,优于目前相关文献报道的方法。该框架易于扩展到其他3D医疗图像的目标检测任务中,对辅助医师诊治具有重要的应用价值。
Abstract
Aim

ing at the problems that traditional lung nodules detection methods can only get low sensitivities and a lot of false positives, this paper presents a retrieval method for lung nodules CT image based on end-to-end two-dimensional full convolution object recognition network (2D FCN) and three-dimensional target classification convolution neural network (3D CNN). Firstly, the method builds the 2D CNN for candidate selection to detect and locate the suspected regions on axial slices, and outputs an image that is the same size as the original image and is marked. Secondly, the three-dimensional patches of each candidate are extracted to train the 3D CNN. Finally, the trained 3D model is used to classify the false positive nodules. Experimental results on the LIDC-IDRI dataset show that the proposed method can achieve the recall rate of nodules of 98.2% at 36.2 false positives per scan. In the false positive reduction, the method respectively achieves high detection sensitivities of 87.3% and 97.0% at 1 and 4 false positives per scan. Experimental results on the LIDC-IDRI dataset show that the proposed method is highly suited to be used for lung nodules detection, achieves high recall rate and accuracy and outperforms the current reported method. Meanwhile, the proposed framework is general and can be easily extended to many other 3D object detection tasks from volumetric medical images, and it has an important application value in clinical practice with the aid of radiologists and surgeons.

苗光, 李朝锋. 二维和三维卷积神经网络相结合的CT图像肺结节检测方法[J]. 激光与光电子学进展, 2018, 55(5): 051006. Guang Miao, Chaofeng Li. Detection of Pulmonary Nodules CT Images Combined with Two-Dimensional and Three-Dimensional Convolution Neural Networks[J]. Laser & Optoelectronics Progress, 2018, 55(5): 051006.

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