Biomedical Engineering Research Center, Asan Institute of Life Science, Asan Medical Center, 388-1 Pungnap2-dong, Songpa-gu, Seoul, Republic of Korea.
VUNO, 6F, 507, Gangnamdae-ro, Seocho-gu, Seoul, Republic of Korea.
J Digit Imaging. 2018 Aug;31(4):415-424. doi: 10.1007/s10278-017-0028-9.
This study aimed to compare shallow and deep learning of classifying the patterns of interstitial lung diseases (ILDs). Using high-resolution computed tomography images, two experienced radiologists marked 1200 regions of interest (ROIs), in which 600 ROIs were each acquired using a GE or Siemens scanner and each group of 600 ROIs consisted of 100 ROIs for subregions that included normal and five regional pulmonary disease patterns (ground-glass opacity, consolidation, reticular opacity, emphysema, and honeycombing). We employed the convolution neural network (CNN) with six learnable layers that consisted of four convolution layers and two fully connected layers. The classification results were compared with the results classified by a shallow learning of a support vector machine (SVM). The CNN classifier showed significantly better performance for accuracy compared with that of the SVM classifier by 6-9%. As the convolution layer increases, the classification accuracy of the CNN showed better performance from 81.27 to 95.12%. Especially in the cases showing pathological ambiguity such as between normal and emphysema cases or between honeycombing and reticular opacity cases, the increment of the convolution layer greatly drops the misclassification rate between each case. Conclusively, the CNN classifier showed significantly greater accuracy than the SVM classifier, and the results implied structural characteristics that are inherent to the specific ILD patterns.
本研究旨在比较浅层学习和深度学习在分类间质性肺疾病(ILDs)模式方面的表现。使用高分辨率计算机断层扫描图像,两位经验丰富的放射科医生标记了 1200 个感兴趣区域(ROI),其中 600 个 ROI 分别使用 GE 或西门子扫描仪获取,每组 600 个 ROI 由包括正常和五种区域性肺部疾病模式(磨玻璃影、实变、网状影、肺气肿和蜂窝肺)的 100 个 ROI 组成。我们采用了具有六个可学习层的卷积神经网络(CNN),其中包括四个卷积层和两个全连接层。将分类结果与支持向量机(SVM)的浅层学习分类结果进行比较。CNN 分类器的准确性明显优于 SVM 分类器,提高了 6-9%。随着卷积层的增加,CNN 的分类准确性从 81.27%提高到 95.12%,表现出更好的性能。特别是在正常和肺气肿病例之间或蜂窝肺和网状影病例之间存在病理模糊的情况下,卷积层的增加大大降低了每个病例之间的错误分类率。总之,CNN 分类器的准确性明显高于 SVM 分类器,结果暗示了ILD 特定模式所固有的结构特征。