Imaging Collaboration: From Pen and Ink to Artificial Intelligence June 2, 2018
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1 Imaging Collaboration: From Pen and Ink to Artificial Intelligence June 2, 2018 Curtis P. Langlotz, MD, PhD Professor of Radiology and Biomedical Informatics Director, Center for Artificial Intelligence for Medicine & Imaging Associate Chair, Information Systems, Department of Radiology Medical Informatics Director for Radiology, Stanford Health Care
2 Samuel J. Dwyer, III, PhD
3 Investigative Radiology 10: , 1975 Multi-Planar Reconstruction
4 3D Surface Rendering 4 J Comput Assist Tomogr 5: 60-67, 1981
5 Financial Modeling of PACS Radiology 144: , 1982 Radiology 206: ,
6 PACS System Design Radiology 152: ,
7 Modeling of PACS Storage Capacity Radiology 169: ,
8 Comparison of Film to Digital Images Radiographics 12: ,
9 J Digit Imaging 9: ,
10
11 Disclosures and Acknowledgments Board of directors, Radiological Society of North America Product advisory board, Nuance Communications Shareholder and advisor, whiterabbit.ai Shareholder and advisor, Nines.ai Research support from: Google Philips Siemens GE Healthcare Paustenbach Medical AI Research Fund
12 Chapters 1. Perfect Pictures, Imperfect Prose 2. Expressing an Imaging Observation 3. Radiology Reporting Best Practices 4. A Guide to Reporting Style Practical Guide 5. Mastering Speech Recognition 6. Organizing the Radiology Report 7. The History of Radiology Reporting 8. Toward Structured Reporting 9. Standard Terminology for the Radiology Report 10. How to Think about Imaging Information History and Foundations 11. Decision Making for Diagnostic Imaging 12. The Future of Radiology Reporting 12
13 Morton, WJ & Hammer, EW The X- Ray or Photography of the Invisible and Its Value in Surgery
14 The First Radiology Reports (1896) I only got the The X-ray shows plainly that there is no stone of an appreciable size in the kidney. negative today and could not therefore report earlier The picture is not so strong as I would like but it is strong enough to differentiate the parts. 14 Courtesy New York Academy of Medicine
15 Dictation Tools Over the Last Century 15
16 83 y/o F, aortic valve replacement, CHF 18 months later
17 Radiology AI v4.0 June 2, 2018 Curtis P. Langlotz, MD, PhD Professor of Radiology and Biomedical Informatics Director, Center for Artificial Intelligence for Medicine & Imaging Associate Chair, Information Systems, Department of Radiology Medical Informatics Director for Radiology, Stanford Health Care
18 AI: Artificial Intelligence ML: Machine Learning NN: Neural Networks DL: Deep Learning Definitions AI: When computers do things that make humans seem intelligent ML: Rapid automatic construction of algorithms from data NN: Powerful form of machine learning DL: Neural networks with many layers
19 AI v1.0-v2.0: History
20 AI v1.0: AI: Feature Engineering Benign Malignant Custom programming Machine Learning AI v2.0: Benign Cancer Not Cancer Malignant 20 Algorithm icon by Sergey Novosyolov from the Noun Project
21 AI 2.0: Machine Learning spiculation microcalcification
22 Forms of Machine Learning Benign Malignant Nearest neighbor Linear support vector machine Radial support vector machine spiculation Decision tree Random forest Naïve Bayes microcalcification
23 AI v1.0: AI: Feature Engineering Benign Malignant Custom programming AI v2.0: Machine Learning Benign Cancer Not Cancer Malignant AI v3.0: Neural Networks and Deep Learning Benign Cancer Not Cancer Malignant 23
24 AI v3.0: The Present
25 Neural Network A flexible and powerful form of machine learning. Malignant Benign
26 Motivations: ImageNet 14 million images 21,841 distinct labels: 856 types of bird 993 types of tree 157 musical instruments Russakovsky O, Deng J, Su H, et al. ImageNet Large Scale Visual Recognition Challenge. Int J Comput Vis. 2015;115(3):
27 Deep Neural Networks: Tens of Millions of Parameters
28 Learning Object Recognition Faces Cars Elephants Chairs Courtesy of Andrew Ng
29 Karpathy, Andrej & Li, Fei Fei. Deep Visual-Semantic Alignments for Generating Image Descriptions, CVPR,
30 Data Labeling
31 Supported by Departments of: Radiology Pathology Medicine Ophthalmology Dermatology Collaborations with: Andrew Ng lab Fei Fei Li lab Chris Re lab Curt Langlotz, MD, PhD Matt Lungren, MD, MPH
32 Deep Learning Research in Radiology Images and Health Data from Patients and Organizations Image Transfer and Labeling Labeled Training Data New Deep Learning Methods Decision Support Systems Evaluation Deep Learning Explanation Methods Actionable Advice
33 Data Science Enterprise Resource Medical ImageNet EHR Images Omics Honest Broker (De-ID API) Data Commons App Ecosystem + Biobank Bench scientists Clinical researchers Students + trainees
34 Radiologist Labels 1: No Significant Abnormality 4: Possible Significant Abnormality May Need Action 9: Critical, Clinical Notified 1.5 million studies
35 Image Labeling Hassanpour, S & Langlotz, CP. Artif Intell Med 23(1):84-9, 2016.
36 The Power of Weak Labeling 1,000 Human expert labels CNN 85% accuracy 100,000 1,000 Rule-based weak labels CNN 83% 87% accuracy
37 Visual Genome: Connecting Language and Vision Using Crowdsourced Dense Image Annotations Ranjay Krishna, Yuke Zhu, Oliver Groth, Justin Johnson, Kenji Hata, Joshua Kravitz, Stephanie Chen, Yannis Kalantidis, Li Jia-Li, David Ayman Shamma, Michael Bernstein, Li Fei-Fei A man is taking a picture behind a girl feeding an elephant.
38 Decision Support
39
40 Saliency Maps Machine learning enables systems tailored to local demographics.
41 Deep Learning to Improve MRI Image Quality High SNR ASL Synthetic ASL T2 weighted Proton density for regularized de-noising Low SNR ASL Enhao Gong John Pauly Greg Zaharchuk Stanford EE & Neuroradiology Difference map vs High SNR + Difference map vs High SNR
42 Stanford Healthcare AI Bootcamp
43 Expert-Level Chest Radiograph Interpretation Matt Lungren, MD, MPH and Andrew Ng, PhD.
44 1 Radiologist-Algorithm AUC Comparison =Statistically significant difference Radiologists Algorithm
45 AI for Global Health
46 AI to Augment Radiologists and Orthopedic Surgeons
47
48
49
50
51 Benefits of AI Throughout the Image Life Cycle Communicate timely data for a learning health system Predict positivity rate among similar patients Image reporting Test selection Select precise treatment with global reach Disease classification Image reconstruction Lower radiation dose and imaging time Computer aideddetection Image quality control Prevent/detect disease early among populations Image triage Reduce patient call-backs Decrease length of stay
52 The Role of Professional Organizations
53 Building Healthcare AI: Education Radiology trainees Refresher courses Scientific sessions Learning center Crowds cure cancer DEEP LEARNING CLASSROOM Clinical radiologists Research scientists Health IT industry
54 Building Healthcare AI: Research Radiology trainees Clinical radiologists Pediatric Bone Age Challenge Research scientists Health IT industry
55 Building Healthcare AI: Research & Education Radiology trainees Refresher courses Scientific sessions Learning center Crowds cure cancer DEEP LEARNING CLASSROOM Pediatric Bone Age Challenge Clinical radiologists Research scientists Health IT industry
56 Building Radiology AI: The Role of Professional Organizations Educate clinical users of AI algorithms Develop a robust technical workforce Convene collaborations: radiologists, scientists, industry Support development of AI use cases Assemble publicly-available training data sets Advocate for and provide research funding for AI Establish standards for AI data and algorithms Encourage balanced regulation of AI technology
57 Challenges of Machine Learning
58 Machine Learning Weakness: First Principles Courtesy of Dr Donna D'Souza, Radiopaedia.org Marcus G. Deep Learning: A Critical Appraisal.
59 Machine Learning Weakness: Inferring Abstract Concepts doi: /GII
60 Machine learning security: These are not stop signs? Eykholt et al. Robust Physical-World Attacks on Machine Learning Models. arxiv.org/abs/
61 Machine learning security: Everything is a toaster.
62 Adversarial Attacks Against Medical Deep Learning Systems Finlayson SG, Kohane IS, Beam AL. Adversarial Attacks Against Medical Deep Learning Systems
63 Radiology Example: Pneumothorax Detection Original Modified Finlayson SG, Kohane IS, Beam AL. Adversarial Attacks Agains Medical Deep Learning Systems
64 Radiology AI v4.0 #radiologyai4
65 The Future of AI in Radiology Today Radiology AI v4.0 Hype over binary detection tasks Radiologists fear systems designed to replace them Primary focus on neural network architecture Static training data sets created at great cost Private data sets from single institutions Single apps built for the average patient Systems rely solely on machine learning Peer-reviewed publication One-time regulatory approval process One-size-fits-all AI algorithms to health care organizations Recognition of task complexity Radiologists embrace systems that augment the care team Major focus on curation of high-quality labeled data Routine care creates training data for a learning health system Public challenges using multi-institutional data Multiple precision apps built for specific patient groups Systems combine machine learning and symbolic systems Open pre-print followed by peer-reviewed publication Post-approval monitoring of system performance Software and services that enable health care organizations to develop their own algorithms #radiologyai4
66
67 Thank You Curtis P. Langlotz, MD, PhD Professor of Radiology and Biomedical Informatics Director, Center for Artificial Intelligence for Medicine & Imaging Associate Chair for Information Systems Department of Radiology, Stanford University Informatics Director for Radiology Stanford Health
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