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Received：20 August 2021，
Revised：2021-11-23，
Accepted：30 November 2021，
Published：16 March 2022
移动端阅览
目的
2
脑卒中发病征兆不明显，发病速度快且致死率高，目前医学领域的主要诊疗手段仍是针对脑卒中病时和病后，但在病前预测方面缺少有效办法。中医对于治未病等效果显著，其中望诊更是中医诊疗的重要方式。本文结合中医望诊，基于面部与手部图像提出了一种多分支深度特征融合的中医脑卒中辅助诊断方法。
方法
2
针对不同部位图像，分别构建两部位的双分支特征提取模块，将面部和手部的重点区域作为主体分支提取主要特征。根据中医望诊在面部与手部诊疗的特点，进一步将眉心的纹理特征和掌心的颜色特征作为辅助信息提取辅助特征；在此基础上提出信息交互模块(information interaction module，IIM)，将主要特征与辅助特征进行有效信息交互，从而辅助主体分支提取更有区别性的信息；最终将两部位的特征进行融合降维用于脑卒中辅助诊断。
结果
2
本文将采集的3 011例面部和手部图像数据进行筛查扩充后作为实验数据集，并在不同评价指标下与当前主流的分类模型进行对比。实验结果表明，本文方法在准确性上达到了83.36%，相比ResNet-34、DenseNet121、VGG16(Visual Geometry Group 16-layer net)和InceptionV3等其他主流分类模型性能提高了3%~7%；在特异性和敏感性方面分别为82.47% 和85.10%，其效果优于对比方法。
结论
2
本文方法能够有效结合中医望诊的诊疗经验并通过传统面部和手部图像实现对脑卒中的有效预测，为中医望诊在脑卒中方面的客观化和便捷化发展提供了帮助。
Objective
2
Stroke is a severe human cerebrovascular disease that causes brain tissue damage due to sudden rupture of blood vessels or vascular obstruction originated blood flow inefficiency. The incidence of ischemic stroke is high frequency
high recurrence rate and high fatality rate. Traditional Chinese medicine (TCM) has its priority of stroke. In the four-diagnosis-inspection
listening
asking and feeling the pulse-(in Chinese) of Chinese medicine
the prime step of inspection shows that information extraction is one of the essential factors of TCM. But
TCM has its constraints of medical standardization and manual factor issues. A deep learning technology is benefit to further recognize the constraints of TCM.
Method
2
Our research illustrates a dual-branch cross-attention feature fusion model (DCFFM) based on facial images and hand images. It can assists in predicting stroke disease well. The overall model is divided into three parts: facial feature extraction module
hand feature extraction module and feature fusion module. For the facial feature extraction module
we construct the subject branch and auxiliary information branch to extract facial features. In accordance with the guidance of Chinese medicine doctors
we pre-process the facial image and use the key diagnostic area of the stroke in the face as the input of the main branch. In addition
we also integrate the knowledge of inspection of TCM to cut out the image of the area around the eyebrows
and use the Sobel filter to extract the gradient image as the input of the auxiliary information branch. For the hand feature extraction module
this demonstration adopts the same double-branch structure to cut out the palm area as the input of the main branch. In order to more stably and accurately reflect the pathological condition of the hand and reflect the small changes in the characteristics of the hand
we convert the palm image from the RGB color space to the HSV color space and transfer it to the differentiated auxiliary information branch. The proposed branches are respectively input to their respective convolution blocks
and the depth characteristics of the input data are extracted based on the convolution operation. Max pooling is used on the feature maps and batch normalization is used to prevent the model from over-fitting. In addition
we use two loss functions to constrain the training of the two feature extraction modules
and use the total loss to constrain the entire model. Between the two branches of each feature extraction module
we built an information interaction module (IIM) for further information interaction amongst the branches to reveal the model extract distinctive features. It assigns a certain weight to the feature map of auxiliary information and then interconnected with the feature of the subject branch. We use 1 × 1 convolution fusion to reduce dimensionality. Under no special operations circumstances
the IIM can be trained in an end-to-end manipulation. For the feature fusion module
multiple convolutional layers are used for overall fusion dimensionality reduction to generate the prediction result via the multi-branch deep feature fusion based on fusing the depth features of the facial feature extraction module and the hand feature extraction module.
Result
2
In order to aid model training and improve the stability and robustness of the model
our demonstration screens and extends the collected 3 011 face and hand image data. We remove some scrambled images with scars and conduct the data extension by horizontal flipping. We remove some images of peeling
disability
background clutter and implement random option for the remaining images to expand the data by horizontal flipping. It is determined that 3 964 images of positive and negative samples are involved as the experimental data set. Our multiple sets of comparative experiments and ablation experiments have been facilitated based on a variety of evaluation indicators to verify the performance of the model
such as accuracy
specificity
sensitivity
and F1-score. First
we compare the overall performance of the proposed method with the current mainstream classification algorithms. Experimental results show that the accuracy of the method proposed reaches 83.36%
which is 3%—7% higher than the performance of other mainstream classification models. Based on ten-fold cross-validation
the specificity and sensitivity reached 82.47% and 85.10% respectively. The illustrated sensitivity shows a relatively large advantage
indicating that the method in this paper has a better performance for the detection of true positives. Next
we still verified the impact of facial feature extraction module
hand feature extraction module and IIM on the performance of the model. This analyzed results show that feature extraction of face data and hand data can effectively improve the performance of the model simultaneously. In addition
the IIM has targeted the sensitivity and specificity of the model.
Conclusion
2
Our method can use human facial features and human hand data to assist in stroke prediction
and has good stability and robustness. Meanwhile
the demonstrated IIM also promotes the information interaction between multi-branch tasks.
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