Castro-Mateos, I., Hua, R., Pozo, J.M. et al. (2 more authors) (2016) Intervertebral disc classification by its degree of degeneration from T2-weighted magnetic resonance images. European Spine Journal. ISSN 0940-6719
Abstract
PURPOSE: The primary goal of this article is to achieve an automatic and objective method to compute the Pfirrmann's degeneration grade of intervertebral discs (IVD) from MRI. This grading system is used in the diagnosis and management of patients with low back pain (LBP). In addition, biomechanical models, which are employed to assess the treatment on patients with LBP, require this grading value to compute proper material properties. MATERIALS AND METHODS: T2-weighted MR images of 48 patients were employed in this work. The 240 lumbar IVDs were divided into a training set (140) and a testing set (100). Three experts manually classified the whole set of IVDs using the Pfirrmann's grading system and the ground truth was selected as the most voted value among them. The developed method employs active contour models to delineate the boundaries of the IVD. Subsequently, the classification is achieved using a trained Neural Network (NN) with eight designed features that contain shape and intensity information of the IVDs. RESULTS: The classification method was evaluated using the testing set, resulting in a mean specificity (95.5 %) and sensitivity (87.3 %) comparable to those of every expert with respect to the ground truth. CONCLUSIONS: Our results show that the automatic method and humans perform equally well in terms of the classification accuracy. However, human annotations have inherent inter- and intra-observer variabilities, which lead to inconsistent assessments. In contrast, the proposed automatic method is objective, being only dependent on the input MRI.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Springer Verlag. This is an author produced version of a paper subsequently published in European Spine Journal. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | 2D; Active contour model; Automatic; Classification; Degeneration; IVD; MR; Neural network |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Funding Information: | Funder Grant number EUROPEAN COMMISSION - FP6/FP7 MDPAEDIGREE - 600932 EUROPEAN COMMISSION - FP6/FP7 MYSPINE - 269909 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 01 Aug 2016 12:34 |
Last Modified: | 21 Jul 2017 15:21 |
Published Version: | http://dx.doi.org/10.1007/s00586-016-4654-6 |
Status: | Published |
Publisher: | Springer Verlag |
Refereed: | Yes |
Identification Number: | 10.1007/s00586-016-4654-6 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:102863 |