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Overview of deep learning in medical imaging

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Abstract

The use of machine learning (ML) has been increasing rapidly in the medical imaging field, including computer-aided diagnosis (CAD), radiomics, and medical image analysis. Recently, an ML area called deep learning emerged in the computer vision field and became very popular in many fields. It started from an event in late 2012, when a deep-learning approach based on a convolutional neural network (CNN) won an overwhelming victory in the best-known worldwide computer vision competition, ImageNet Classification. Since then, researchers in virtually all fields, including medical imaging, have started actively participating in the explosively growing field of deep learning. In this paper, the area of deep learning in medical imaging is overviewed, including (1) what was changed in machine learning before and after the introduction of deep learning, (2) what is the source of the power of deep learning, (3) two major deep-learning models: a massive-training artificial neural network (MTANN) and a convolutional neural network (CNN), (4) similarities and differences between the two models, and (5) their applications to medical imaging. This review shows that ML with feature input (or feature-based ML) was dominant before the introduction of deep learning, and that the major and essential difference between ML before and after deep learning is the learning of image data directly without object segmentation or feature extraction; thus, it is the source of the power of deep learning, although the depth of the model is an important attribute. The class of ML with image input (or image-based ML) including deep learning has a long history, but recently gained popularity due to the use of the new terminology, deep learning. There are two major models in this class of ML in medical imaging, MTANN and CNN, which have similarities as well as several differences. In our experience, MTANNs were substantially more efficient in their development, had a higher performance, and required a lesser number of training cases than did CNNs. “Deep learning”, or ML with image input, in medical imaging is an explosively growing, promising field. It is expected that ML with image input will be the mainstream area in the field of medical imaging in the next few decades.

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Acknowledgements

The authors are grateful to members in the Computational Intelligence in Biomedical Imaging Laboratory at the Illinois Institute of Technology, and to Suzuki’s Laboratory at the University of Chicago for their valuable contributions to machine-learning and deep-learning research in medical imaging over the past 15 years, and to Ms. Lanzl for her edits.

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  1. Medical Imaging Research Center and Department of Electrical and Computer Engineering, Illinois Institute of Technology, 3440 South Dearborn Street, Chicago, IL, 60616, USA

    Kenji Suzuki

  2. World Research Hub Initiative (WRHI), Tokyo Institute of Technology, Tokyo, Japan

    Kenji Suzuki

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Correspondence to Kenji Suzuki.

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Machine learning and computer-aided diagnosis technologies developed in the author Kenji Suzuki’s laboratories have been non-exclusively licensed to several companies and have been commercialized. The author Kenji Suzuki received royalty distributions from the companies.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board (IRB) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the studies. The studies complied with the Health Insurance Portability and Accountability Act (HIPAA).

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Suzuki, K. Overview of deep learning in medical imaging. Radiol Phys Technol 10, 257–273 (2017). https://doi.org/10.1007/s12194-017-0406-5

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