||Development of automatic breast cancer classification for mammography with convolutional neural network, transfer learning, and racially diverse datasets
||Department of BioMedical Engineering
Convolutional Neural Network
我們收集了三個公開數據集分別來自CBIS-DDSM，BCDR和INbreast，我們也從成大醫院收集了一個數據集。為了預測各種影像尺寸的ROI，我們提出了patch classification-based model和ROI pooling。Patch classification-based model是指CNN被延伸來處理更大影像。我們的方法可以處理四種不同大小的ROI。 ROI pooling可以處理任何尺寸的ROI。為了解決數據不平衡問題，我們調整了一個mini batch-size的數據組成，並我們也使用class weight。在研究中，patch classification-based model可以獲得整體73％的準確度，AUC也可以達到0.70以上。相比之下，ROI只能有61%的準確度。我們的研究發現，當陰性(negative)病例比陽性(positive)病例多20倍時，class weight只達到55％的準確率，但調整數據組成可達到約65％的準確率。當我們的模型與人類專家進行比較時，我們的實驗顯示專家在BI-RADS 3和4中僅具有50％的準確度，但我們的模型可以保持67％的準確度。此外，我們的模型在應用於成大醫院數據集時可以達到78％的準確率。我們的研究結果證明深度學習有很大的潛力來降低診斷的高召回率。此外，它也證明用西方數據集訓練的模型似乎可以適用於亞洲人口而無需任何再訓練。雖然我們能需要更多資料來驗證我們的模型，目前研究結果已經展現出深度學習在降低召回率以及應用在亞洲人口上有不錯的結果。
Breast Cancer is the most common cancer for women. In Taiwan and Asia countries, the average age of diagnosis is 10 years younger than that of western countries. To detect the breast cancer in the early stage, mammography is the most widely used modality. However, such screening usually results in a high recall rate or a high false positive rate. For decades, to solve this problem, researchers have tried to use image processing methods to build the CAD system. Recently, researchers have started to use methods of deep learning. The research of deep learning has shown promising results to build classifiers for whole X-ray images. Nonetheless, experts generally have known the location of the lesion, but it was difficult for them to diagnose some cases, especially in BI-RADS 3 and 4. Therefore, in our research, we tried to build the system that was dependent on the manual ROI extraction rather than whole images. Furthermore, to examine whether the model can reduce the high recall rate, we analyzed the performance of BI-RADS 3 and 4. Lastly, we examined whether the model trained with western data could be applied to the Asian population.
We collected three public datasets from CBIS-DDSM, BCDR, and INbreast and one private dataset from NCKU Hospital. To predict ROIs in various sizes, we adopted the patch classification-based model and ROI pooling. Patch classification-based model means the common convolutional neural networks was extended to process larger images. Our patch classification-based model can process ROIs in four different sizes. ROI pooling can process ROIs in any sizes. To solve the problem of data imbalance, we adjusted the data composition in one min-batch size and utilized the class weight. In patch classification-based model, our research result has shown the overall accuracy of 73.1% and achieved the AUC above 0.70 in any ROI sizes. Compared with patch classification-based model, ROI pooling only got the accuracy of 61%. In addition, our research found that when negative cases were 20 times more than positive cases, the class weight only achieved the accuracy of 55%, but the adjustment of data composition can achieve about 65%. When we compared with human experts, our experiment showed experts only possessed the accuracy of 50% in BI-RADS 3 and 4, but our models can maintain 67%. Moreover, our model can achieve the accuracy of 78% when it was applied to the dataset of NCKU Hospital. Our research results have shown that deep learning had the potential to reduce the high recall rate in clinics. Besides, it has demonstrated that the model trained with western dataset seemed to be applicable to Asian population without any fine-tuning. Although we still needed more clinical data to verify our results, our proposed model has shown promising results in the reduction of recall rate and the application of the Asian population.
Chapter 1 Overview 1
Chapter 2 Introduction 2
2.1 Breast Cancer 2
2.1.1 Mammography 3
2.1.2 The High Recall Rate 5
2.2 Computer Aided Diagnosis (CAD) System 7
2.2.1 The Benefit of the CAD System 7
2.2.2 Image Processing Technology 7
220.127.116.11 Texture Analysis 8
18.104.22.168 Detection for Masses 8
22.214.171.124 Detection for microcalcification 11
126.96.36.199 The Advantage of image processing technology 12
2.2.3 The Current CAD system 12
2.2.4 The CAD System on the Asian population 13
2.3 Deep Learning 15
2.3.1 Transfer Learning 16
2.3.2 Current Deep Learning Research on Mammography 18
188.8.131.52 Multiple-Stage Classification 19
184.108.40.206 Methods for Segmentation 20
220.127.116.11 Methods for Object Detection 21
18.104.22.168 Patch-Classification-Based Methods 22
2.4 Specific Aims 24
Chapter 3 Material and Methods 26
3.1 Data Acquisition 26
3.1.1 CBIS-DDSM 27
3.1.2 INbreast and Breast Cancer Digital Repository 27
3.1.3 National Cheng Kung University Hospital 27
3.2 Data Preprocessing and the Preparation for Training 30
3.2.1 Preprocessing 30
3.2.2 The Definition of the Size of Region of Interest 30
3.2.3 The Way to Split the Data 30
3.2.4 Data Augmentation 33
3.2.5 The Extraction from Background 33
3.3 Proposed Architecture 34
3.3.1 The Extension of the Convolutional Neural Network 36
22.214.171.124 Block Design 36
3.3.2 ROI Pooling 37
3.4 Data Generator 38
3.5 Imbalanced Classes 39
3.5.1 Class Weights 39
3.5.2 The Adjustment of Data Composition in One Mini-Batch Size 39
3.6 Training Detail 40
3.7 Li Shen’s Research 43
3.7.1 The Dataset 43
3.7.2 Data Augmentation 43
3.7.3 The Architecture of the Method 43
3.7.4 Training Detail 44
3.8 Operating Environment 45
Chapter 4 Results and Discussion 46
4.1 Class weights and the adjustment of data composition in one mini-batch size 46
4.2 Classification with 3 classes and 2 classes 47
4.3 The performance of each channel of the classification with 2 classes 49
4.4 The comparison between ROI pooling and patch classification-based model 52
4.5 The analysis with BI-RADS and CBIS-DDSM 53
4.6 The comparison between Shen’s research and my research 54
4.6.1 The number of iterations 55
4.6.2 The resizing 56
4.6.3 The bug in their program 56
4.7 The results from the data from NCKU Hospital 57
4.8 The Summary 59
4.8.1 Class Weight vs. The adjustment of data composition in one mini-batch size 59
4.8.2 The classification with 2class vs. 3 class 59
4.8.3 Patch classification-based model vs. ROI pooling 59
4.8.4 The deep learning model vs. Human experts 60
4.8.5 Li Shen’s research vs. My model 60
4.8.6 The performance of NCKU Hospital 60
4.9 Future works 61
Chapter 5 Conclusion 62
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