Deep Clustering Activation Maps for Emphysema SubtypingDownload PDF

Mar 24, 2021 (edited Apr 20, 2021)MIDL 2021 Conference Short SubmissionReaders: Everyone
  • Keywords: Deep Clustering, Emphysema Clustering, Class Activation Maps
  • TL;DR: Deep Clustering Activation Maps for Emphysema Subtyping
  • Abstract: We propose a deep learning clustering method that exploits dense features from a segmentation network for emphysema subtyping from computed tomography (CT) scans. Using dense features enables high-resolution visualization of image regions corresponding to the cluster assignment via dense clustering activation maps (dCAMs). This approach provides model interpretability. We evaluated clustering results on 500 subjects from the COPDGene study, where radiologists manually annotated emphysema sub-types according to their visual CT assessment. We achieved a 43% unsupervised clustering accuracy, outperforming our baseline at 41% and yielding results comparable to supervised classification at 45%. The proposed method also offers a better cluster formation than the baseline, achieving 0.54 in silhouette coefficient and 0.55 in David-Bouldin scores.
  • Paper Type: methodological development
  • Primary Subject Area: Unsupervised Learning and Representation Learning
  • Secondary Subject Area: Application: Radiology
  • Paper Status: original work, not submitted yet
  • Source Code Url: being prepared
  • Data Set Url: http://www.copdgene.org/
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  • Authorship: I confirm that I am the author of this work and that it has not been submitted to another publication before.
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