Abstract
Research into artificial intelligence (AI) has made tremendous progress over the past decade. In particular, the AI-powered analysis of images and signals has reached human-level performance in many applications owing to the efficiency of modern machine learning methods, in particular deep learning using convolutional neural networks. Research into the application of AI to medical imaging is now very active, especially in the field of cardiovascular imaging because of the challenges associated with acquiring and analysing images of this dynamic organ. In this Review, we discuss the clinical questions in cardiovascular imaging that AI can be used to address and the principal methodological AI approaches that have been developed to solve the related image analysis problems. Some approaches are purely data-driven and rely mainly on statistical associations, whereas others integrate anatomical and physiological information through additional statistical, geometric and biophysical models of the human heart. In a structured manner, we provide representative examples of each of these approaches, with particular attention to the underlying computational imaging challenges. Finally, we discuss the remaining limitations of AI approaches in cardiovascular imaging (such as generalizability and explainability) and how they can be overcome.
Key points
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Artificial intelligence (AI) algorithms have shown impressive results in specific and often time-consuming cardiovascular imaging tasks such as image segmentation, anomaly detection and patient selection; however, these applications are limited to specific tasks in the clinical workflow.
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In cardiovascular imaging, AI algorithms are often purely data-driven but can be improved when associated with biophysical models of the heart, which enables the integration of pre-existing knowledge of human anatomy and physiology.
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A bottleneck in AI applications often lies in the collection of imaging data and their annotation by experts, which is limited by the lack of resources and expertise; therefore, the creation of large databases must be a community effort.
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The appropriate integration of AI algorithms into clinical workflows remains an unresolved problem; important security, privacy and explainability issues must be resolved to achieve a sufficiently high level of trust.
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AI algorithms have the potential to enrich the amount and the robustness of information extracted from cardiac images, while at the same time redistributing physician time and work towards patient interaction and complex decision-making tasks.
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Acknowledgements
Part of the authors’ work has been supported by the French Government, through the National Research Agency (ANR): 3IA Côte d’Azur (ANR-19-P3IA-0002), IHU Liryc (ANR-10-IAHU-04) and Equipex MUSIC (ANR-11-EQPX-0030). The research leading to these results has also received European funding from the ERC starting grant ECSTATIC (715093).
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Related links
CAMUS: https://www.creatis.insa-lyon.fr/Challenge/camus/
Kaggle: https://www.kaggle.com/datasets
PyTorch: https://pytorch.org/
STACOM: http://stacom.cardiacatlas.org/
TensorFlow: https://www.tensorflow.org/
UK Biobank: https://www.ukbiobank.ac.uk/
Glossary
- Artificial intelligence
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(AI). In general, algorithms that mimic human intelligence; in this article, algorithms that interpret medical images and data to assist the diagnosis, prognosis and therapy of cardiovascular diseases.
- Deep learning
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Machine learning with artificial neural networks that have a large number of hidden layers.
- Features
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Distinctive attributes of an image or a signal.
- Convolutional neural networks
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Artificial neural network using convolution operations to compute features within its layers.
- Convolution operations
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The weighted sum of neighbouring pixel values in an image.
- Generalizability
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The ability of a machine learning algorithm to perform sufficiently well on a new data set unseen during the training stage; also known as robustness.
- Biophysical modelling
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Mathematical representation of biological phenomena using methods from physics.
- Machine learning
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The capacity of an algorithm to solve a task by exploiting training examples, instead of following predefined explicit instructions.
- Accuracy
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Measurement of agreement between the algorithm prediction and the expected result.
- Supervised learning
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Learning process using user-defined annotations on a training data set.
- Ground truth
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Data corresponding to the expected result of an algorithm.
- Image segmentation
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Specifying regions with labels in a medical image.
- Image registration
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Geometric transformation of an image to align it on another image.
- Motion analysis
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Computation and analysis of apparent displacements from time series of images.
- Overfitting
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When an algorithm is adjusted too closely to the training data during learning at the expense of generalizability to new data.
- Image annotations
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User-defined information associated with the input data.
- Unsupervised learning
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Learning process without user-defined annotations.
- Transfer learning
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Adjustment of a machine learning algorithm from one task to another.
- Artificial neural networks
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Algorithm mapping input to output data, involving multiple layers of non-linear computations.
- Cost function
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Criterion to be minimized during the training phase of machine learning algorithms.
- MRI fingerprinting
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Acquisition of quantitative information from MRI scans that enables clinical decision-making on the basis of digital data rather than visual impressions.
- Multi-scale
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Involving several spatial or temporal resolutions of observation.
- Multi-physics
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Involving several different physical phenomena (such as electrophysiology and solid or fluid mechanics).
- Digital twin
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Patient-specific computational model (of the heart) to visualize and simulate anatomy and physiology.
- Causal
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In which one event (cause) contributes to the occurrence of another event (effect).
- Deterministic
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A system in which a given input always produces the same output (as opposed to probabilistic systems).
- Mechanistic
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Providing explicit information about the underlying biological or physical processes.
- Uncertainty quantification
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Determination of how the output of an algorithm varies if some of its parameters or input are not exactly known.
- Explainability
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An explainable algorithm must produce details that make its process easy to understand.
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Sermesant, M., Delingette, H., Cochet, H. et al. Applications of artificial intelligence in cardiovascular imaging. Nat Rev Cardiol 18, 600–609 (2021). https://doi.org/10.1038/s41569-021-00527-2
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DOI: https://doi.org/10.1038/s41569-021-00527-2
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