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Magnetic Resonance Sequences: Experimental Assessment of Achievements and Limitations

Pedro Furtado
DEI-CISUC, Universidade de Coimbra, Coimbra, Portugal

Abstract—Deep Learning can be applied to learn segmentations of abdominal organs in MRI sequences, a challenging task due to changing morphologies of organs along different slices. Evaluation of outcome is important to decide on applicability and to command further improvements. Software tools include evaluation metrics. Some metrics indicate quasi-perfection, with potential erroneous conclusions, visual inspection and some per organ metrics say otherwise. Our aim is the correct interpretation of commonly available metrics on organs segmentation. The method to do that is to build two architectures (DeepLab, FCN), run segmentation experiments, interpret results. Examples of results as aggregates (mean accuracy 98% weighted IoU 97%) are overly optimistic. Further analysis shows much lower scores (mean IoU 68% IoU of individual organs 78, 66, 59, 41%). We conclude that correct interpretation of the metrics, importance of further architectural or post-processing improvements on false positives.
Index Terms—segmentation, deep learning, assessment

Cite: Pedro Furtado, "Magnetic Resonance Sequences: Experimental Assessment of Achievements and Limitations," Journal of Advances in Information Technology, Vol. 12, No. 1, pp. 66-70, February 2021. doi: 10.12720/jait.12.1.66-70

Copyright © 2021 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.