研究生: |
曾偉杰 Woei-Jye Tseng |
---|---|
論文名稱: |
基於注意力機制的深度學習模型檢測 COVID-19 相關肺炎 Attention Mechanism Based Deep Learning Model to Detect COVID-19–associated Pneumonia |
指導教授: |
廖愛禾
Ai-Ho Liao |
口試委員: |
廖愛禾
Ai-Ho Liao 王智弘 沈哲州 劉浩澧 莊賀喬 |
學位類別: |
碩士 Master |
系所名稱: |
應用科技學院 - 醫學工程研究所 Graduate Institute of Biomedical Engineering |
論文出版年: | 2023 |
畢業學年度: | 112 |
語文別: | 中文 |
論文頁數: | 79 |
中文關鍵詞: | 新型冠狀病毒 、深度學習 、卷積神經網路 、肺部超音波影像 、注意力機制 |
外文關鍵詞: | COVID-19, Deep learning, Convolutional neural networks, Lung ultrasound image, Attention module |
相關次數: | 點閱:86 下載:0 |
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新型冠狀病毒(COVID-19)疫情已持續延燒數年,及早分流輕、重症與降低高風險族群重症死亡率是重要關鍵,過往的文獻表明肺部超音波比起胸腔X光檢查更能精確地診斷出新冠肺炎,隔離病房內使用超音波檢查胸腔,除提供即時、非侵入性影像降低病毒傳染風險,更能協助醫療團隊有效掌握重症患者變化多端的病況。超音波影像的非侵入性與即時顯像之特性,能快速幫助醫事人員給予病患適當治療。此外,深度學習辨識醫療影像於近年高度關注及研究;因此本研究以深度學習神經網路,配合注意力機制模組,優化與可視化三分類COVID-19相關肺炎檢測任務。
主要以網路上的COVID-19肺部超音波資料庫,擷取共2,147張包含健康肺部、一般肺炎及COVID-19肺部超音波影像作為訓練驗證集。於神經網路模型建構部分,採用二維捲積層、批次統一層及ReLU激勵函數層為一捲積主結構,並配合平均池化層進行特徵採樣,共包含五層作為基底模型。而其中四種注意力機制被採用,空間注意力機制模組、空間通道注意力機制模組、非局部特徵注意力機制模組及本研究提出的局部全局注意力機制模組,並加入於不同結構層間做模型訓練及分析。
在模型訓練並分析後,以本研究提出之局部結合全局注意力機制模組於第4個捲積主結構層中配合基底模型,準確率能達到90.68%,精確度則為89.11% 、召回率為89.99% 及F1 score 為89.50%。相較於傳統CNN模型,本研究提出之模型亦表現出較好的分析指標表現與視覺化辨識。從實驗結果來看,提出之注意力機制配合基底模型之輕量化模型能夠有效地辨別三分類COVID-19相關肺炎超音波影像,以協助醫事人員能快速準確的做出診斷並給予治療。
The novel coronavirus (COVID-19) epidemic has been spreading for several years. Early diagnosis of mild and severe cases and reduction of severe mortality in high-risk groups are the key points. Past literature has shown that lung ultrasound is more accurate than lung X-ray examination. After diagnosing COVID-19, ultrasound examination of the chest cavity either provides real-time, non-invasive images to reduce the risk of virus infection or assists the medical team to effectively grasp the changing conditions of critically ill patients. The non-invasive and real-time characteristics of ultrasound systems can quickly help medical staff to give patients appropriate treatment. In addition, deep learning to identify medical images has been highly concerned and studied in recent years; therefore, this study uses deep learning neural networks and an attention module to optimize and visualize three-category COVID-19-related pneumonia detection tasks.
The COVID-19 lung ultrasound database on the Internet was downloaded to extract a total of 2,147 ultrasound images including healthy lungs, general pneumonia and COVID-19 lungs as a training and verification set. In the part of DNN architecture establishment, convolution layer, batch normalization and ReLU activation was used and combined as a main structure block, and came with average pooling layer for feature sampling. The base model comprised 5 main structure blocks. And also 4 different attention modules were introduced including spatial attention module, channel and spatial attention module, non-local attention module and local-global interaction attention module our proposed. These modules were integrated and analyzed between different structural layers during model training. After model training and analysis, using the local combined global attention module proposed in this study with the base model in the fourth convolutional main structure layer, the accuracy rate can reach 90.68%, the precision is 89.11%, and the recall rate It is 89.99% and F1 score is 89.50%. Compared with the traditional CNN model, the model proposed in this study also presented better performance and visual recognition. From the experimental results, the proposed attention module combined with the light weight model of the base model can effectively distinguish three categories of ultrasound images of COVID-19-related pneumonia, so as to assist medical staff to quickly and accurately diagnose and give treatment.
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