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中国生物医学工程学报  2024, Vol. 43 Issue (2): 153-161    DOI: 10.3969/j.issn.0258-8021.2024.02.003
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一种基于双分支注意力神经网络的皮肤癌检测框架
王玉峰1*, 成昊沅1, 万承北1, 张博2, 石爱菊2
1(南京邮电大学通信与信息工程学院,南京 210003)
2(南京邮电大学理学院,南京 210046)
A Skin Cancer Detection Framework Based on Double-Branch Attention Neural Networks
Wang Yufeng1*, Cheng Haoyuan1, Wan Chengbei1, Zhang Bo2, Shi Aiju2
1(School of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China)
2(College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210046, China)
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摘要 皮肤癌是一种主要的癌症,在过去几十年中快速增长,早期发现可以极大提高治愈率。近年来,基于皮肤镜图像利用深度学习模型(尤其是各种卷积神经网络)对皮肤癌进行识别和分类获得了广泛应用。但是与传统的图像识别分类不同,皮肤病检测任务存在数据不平衡、类间差异性小以及皮损面积占比少等方面的挑战。为此,本研究提出一种基于双分支注意力卷积神经网络(DACNN)皮肤癌分类框架。在数据预处理阶段,根据更细粒度的皮肤病类别,对数据集进行分解,降低数据不平衡程度。从网络结构上,上分支网络利用注意力残差学习(ARL)模块有效提取潜在的病变区域特征,接着利用损伤定位网络(LLN)模块定位病变区域。对其裁剪放大输入由ARL构成的下分支网络,进行局部细节的特征提取,然后结合上下分支网络的特征,进行有效的识别。最后,为了进一步缓解数据不平衡问题,在训练阶段中采用加权损失函数。在包含10 015张皮肤镜图像数据集上,对所提出的DACNN模型与几种典型的皮肤病变检测框架进行了实验验证和比较。结果表明,DACNN皮肤癌变检测框架的Sensitivity、Accuracy和F1_score等性能指标分别达到了0.922、0.942和0.933, 与已有的递归注意力卷积神经网络模型RACNN相比,以上3个指标分别提升了3.48%、2.95%和3.44%。总之,对于各类图像数不平衡,类间图像差异性小以及皮损面积占比少的皮肤镜图像而言,采用适当的类分解,以及双分支注意力神经网络结构首先对潜在的病变区域进行定位放大,然后进行局部细节的特征提取,能够极大的提高皮肤癌的检测准确度。
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作者相关文章
王玉峰
成昊沅
万承北
张博
石爱菊
关键词 皮肤癌双分支神经网络注意力机制数据不平衡    
Abstract:Skin cancer is a major cancerand has increased rapidly in the past decades. Early detection can significantly increase the cure rate. Recently, deep learning models, especially various convolutional Neural Networks using dermatoscope images (i.e., dermoscopy) have been widely adopted to classify skin lesions. Different from traditional image classification, several challenges in detecting and classifying skin cancers still exist, including imbalanced training data in each skin cancer category, small visual differences between categories, and small area of skin lesion. To solve these challenges, this paper proposed a skin cancer classification framework based on double-branch attention convolutional neural networks (DACNN). First, in data pre-processing, the whole dataset was divided into finer-grained categories according to the natural sub-classes in each category to alleviate the imbalanced data. Next, from the viewpoint of neural network structure, attention residual learning (ARL) modules were used as basic blocks in upper-branch, which was able to effectively extract the features of potential sick area, then thelesion location network (LLN) was designed to localize, cut out and zoom-in the sick sub-area, followed by being sent to down-branch with the same neural structure as the upper-branch, for extracting the locally detailed features. Then, the inferred features from both branches were integrated for effective detection and classification. Moreover, to further alleviate the impact of imbalanced categorical data, weighted loss function was utilized in the model training. The proposed DACNN model was implemented in the real dataset consisting of 10015 dermatoscope images and compared with several typical deep learning based skin lesion detection methods. Experimental results showed that the performance metrics of sensitivity, accuracy and F1_score reached 0.922, 0.942 and 0.933, respectively. Compared with recurrent attention convolutional neural network (RACNN) detection methods, these three metrics were improved by 3.48%, 2.95% and 3.44% respectively. In summary, our work significantly improved the accuracy of dermoscopy based skin cancer detection through appropriate division of dermatoscope image classes, used the double-branch attention neural networks to firstly localize and enlarge the features of potential sick area, and then further extracted the locally detailed features, which solved the intrinsic issues of dermatoscope images, including imbalanced samples in each skin cancer category, vague visual differences between categories, and small areaof skin lesion.
Key wordsskin cancer    double-branch neural network    attention mechanism    unbalanced data
收稿日期: 2021-11-27     
PACS:  R318  
基金资助:国家自然科学基金(61801240)
通讯作者: * E-mail: wfwang@njupt.edu.cn   
引用本文:   
王玉峰, 成昊沅, 万承北, 张博, 石爱菊. 一种基于双分支注意力神经网络的皮肤癌检测框架[J]. 中国生物医学工程学报, 2024, 43(2): 153-161.
Wang Yufeng, Cheng Haoyuan, Wan Chengbei, Zhang Bo, Shi Aiju. A Skin Cancer Detection Framework Based on Double-Branch Attention Neural Networks. Chinese Journal of Biomedical Engineering, 2024, 43(2): 153-161.
链接本文:  
http://cjbme.csbme.org/CN/10.3969/j.issn.0258-8021.2024.02.003     或     http://cjbme.csbme.org/CN/Y2024/V43/I2/153
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