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Detection of Sclerotic Spine Metastases via Random Aggregation of Deep Convolutional Neural Network Classifications

  • Holger R. RothEmail author
  • Jianhua Yao
  • Le Lu
  • James Stieger
  • Joseph E. Burns
  • Ronald M. Summers
Chapter
Part of the Lecture Notes in Computational Vision and Biomechanics book series (LNCVB, volume 20)

Abstract

Automated detection of sclerotic metastases (bone lesions) in Computed Tomography (CT) images has potential to be an important tool in clinical practice and research. State-of-the-art methods show performance of 79 % sensitivity or true-positive (TP) rate, at 10 false-positives (FP) per volume. We design a two-tiered coarse-to-fine cascade framework to first operate a highly sensitive candidate generation system at a maximum sensitivity of \(\sim \)92 % but with high FP level (\(\sim \)50 per patient). Regions of interest (ROI) for lesion candidates are generated in this step and function as input for the second tier. In the second tier we generate \(N\) 2D views, via scale, random translations, and rotations with respect to each ROI centroid coordinates. These random views are used to train a deep Convolutional Neural Network (CNN) classifier. In testing, the CNN is employed to assign individual probabilities for a new set of \(N\) random views that are averaged at each ROI to compute a final per-candidate classification probability. This second tier behaves as a highly selective process to reject difficult false positives while preserving high sensitivities. We validate the approach on CT images of 59 patients (49 with sclerotic metastases and 10 normal controls). The proposed method reduces the number of FP/vol. from 4 to 1.2, 7 to 3, and 12 to 9.5 when comparing a sensitivity rates of 60, 70, and 80 % respectively in testing. The Area-Under-the-Curve (AUC) is 0.834. The results show marked improvement upon previous work.

Keywords

Image Patch Convolutional Neural Network Classification Probability Compute Tomography Volume CADe Scheme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the Intramural Research Program of the NIH Clinical Center.

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Copyright information

© Springer International Publishing Switzerland (outside the USA) 2015

Authors and Affiliations

  • Holger R. Roth
    • 1
    Email author
  • Jianhua Yao
    • 1
  • Le Lu
    • 1
  • James Stieger
    • 1
  • Joseph E. Burns
    • 2
  • Ronald M. Summers
    • 1
  1. 1.Imaging Biomarkers and Computer-Aided Diagnosis Laboratory, Radiology and Imaging SciencesNational Institutes of Health Clinical CenterBethesdaUSA
  2. 2.Department of Radiological SciencesUniversity of CaliforniaIrvine, OrangeUSA

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