Abstract
Objectives
Accurate and efficient knee cartilage and bone segmentation are necessary for basic science, clinical trial, and clinical applications. This work tested a multi-stage convolutional neural network framework for MRI image segmentation.
Materials and methods
Stage 1 of the framework coarsely segments images outputting probabilities of each voxel belonging to the classes of interest: 4 cartilage tissues, 3 bones, 1 background. Stage 2 segments overlapping sub-volumes that include Stage 1 probability maps concatenated to raw image data. Using six fold cross-validation, this framework was tested on two datasets comprising 176 images [88 individuals in the Osteoarthritis Initiative (OAI)] and 60 images (15 healthy young men), respectively.
Results
On the OAI segmentation dataset, the framework produces cartilage segmentation accuracies (Dice similarity coefficient) of 0.907 (femoral), 0.876 (medial tibial), 0.913 (lateral tibial), and 0.840 (patellar). Healthy cartilage accuracies are excellent (femoral = 0.938, medial tibial = 0.911, lateral tibial = 0.930, patellar = 0.955). Average surface distances are less than in-plane resolution. Segmentations take 91 ± 11 s per knee.
Discussion
The framework learns to automatically segment knee cartilage tissues and bones from MR images acquired with two sequences, producing efficient, accurate quantifications at varying disease severities.
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Acknowledgements
We would like to acknowledge Google for providing cloud compute credits used to conduct the experiments. The Osteoarthritis Initiative (OAI) is a public-private partnership funded by the National Institutes of Health (NIH) and private partners including Merck Research Laboratories; Novartis Pharmaceuticals Corporation, GlaxoSmithKline; and Pfizer, Inc. This manuscript was prepared using an OAI public use data set and does not reflect the opinions or views of the OAI investigators, the NIH, or the private funding partners.
Funding
A. A. Gatti was supported by an Ontario Graduate Scholarship, The Arthritis Society, and a Mitacs Accelerate Entrepreneur award. M.R. Maly holds The Arthritis Society Stars Mid-Career Development Award funded by the Canadian Institutes of Health Research-Institute of Musculoskeletal Health and Arthritis and an NSERC Discovery grant that supported this work (MRM: 353715).
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AAG contributed to study conception and design, acquisition of data, analysis and interpretation of data, drafting of manuscript, and critical revision. MRM contributed to acquisition of data, interpretation of data, drafting of manuscript, and critical revision.
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A. A Gatti is the founder of NeuralSeg, Ltd. There are no other conflicts of interest to disclose.
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Gatti, A.A., Maly, M.R. Automatic knee cartilage and bone segmentation using multi-stage convolutional neural networks: data from the osteoarthritis initiative. Magn Reson Mater Phy 34, 859–875 (2021). https://doi.org/10.1007/s10334-021-00934-z
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DOI: https://doi.org/10.1007/s10334-021-00934-z