Automatic quantification of the microvascular density on whole slide images, applied to paediatric brain tumours

  • Christophe Deroulers Univ Paris Diderot-Paris 7, Laboratoire IMNC, UMR 8165 CNRS, Univ Paris-Sud, F-91405 Orsay
  • Volodia Dangouloff-Ros Department of Paediatric Radiology, Hopital Necker Enfants Malades, AP-HP, F-75105 Paris, and INSERM U1000, Paris
  • Mathilde Badoual Univ Paris Diderot, Laboratoire IMNC, UMR 8165 CNRS, Univ Paris-Sud, F-91405 Orsay
  • Pascale Varlet Department of Neuropathology, Centre Hospitalier Sainte-Anne, Paris, and INSERM U1000, Paris, and Univ Paris Descartes, Paris
  • Nathalie Boddaert Department of Paediatric Radiology, Hopital Necker Enfants Malades, AP-HP, F-75105 Paris, and INSERM U1000, Paris, and Univ Paris Descartes, Paris, and UMR 1163, Institut Imagine, Paris

Abstract

Background

Angiogenesis is a key phenomenon for tumour progression, diagnosis and treatment in brain tumours and more generally in oncology. Presently, its precise, direct quantitative assessment can only be done on whole tissue sections immunostained to reveal vascular endothelial cells. But this is a tremendous task for the pathologist and a challenge for the computer since digitised whole tissue sections, whole slide mages (WSI), contain typically around ten gigapixels.

Methods

We define and implement an algorithm that determines automatically, on a WSI at objective magnification 40x, the regions of tissue, the regions without blur and the regions of large puddles of red blood cells, and constructs the mask of blur-free, significant tissue on the WSI. Then it calibrates automatically the optical density ratios of the immunostaining of the vessel walls and of the counterstaining, performs a colour deconvolution inside the regions of blur-free tissue, and finds the vessel walls inside these regions by selecting, on the image resulting from the colour deconvolution, zones which satisfy a double-threshold criterion. The two thresholds involved are automatically computed from the WSI so as to cope with variations in staining and digitisation parameters. A mask of vessel wall regions on the WSI is produced. The density of microvessels is finally computed as the fraction of the area of significant tissue which is occupied by vessel walls. We apply this algorithm to a set of 186 WSI of paediatric brain tumours from World Health Organisation grades I to IV.

Results

The algorithm and its implementation are able to distinguish on the WSI the significant tissue and the vessel walls. The segmentations are of very good quality although the set of slides is very heterogeneous (in tumour type, in staining and digitisation parameters, and inside WSI themselves, where the tissue was often very fragmented). The computation time is of the order of a fraction of an hour for each WSI even though a modest desktop computer is used (a 2012 Mac mini) and the average size of WSI is 7 gigapixels. The computed microvascular density is found to be robust. We find that it strongly correlates with the tumour grade.

Conclusions

We have introduced a method of automatic segmentation of significant, blur-free tissue and of vessel walls, and of quantification of the density of microvessels, in WSI. We successfully tested it on a large variety of brain tumour tissue samples. This method requires no training and estimates automatically several important parameters of the segmentation. It is robust and can easily be applied to other tumour types and other stainings. It should improve the reproducibility of quantitative estimates in pathology while sparing the pathologist time and effort.

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Published
2016-09-19
How to Cite
DEROULERS, Christophe et al. Automatic quantification of the microvascular density on whole slide images, applied to paediatric brain tumours. Diagnostic Pathology, [S.l.], v. 2, n. 1, sep. 2016. ISSN 2364-4893. Available at: <http://www.diagnosticpathology.eu/content/index.php/dpath/article/view/209>. Date accessed: 26 nov. 2020. doi: https://doi.org/10.17629/www.diagnosticpathology.eu-2016-2:209.
Section
Research

Keywords

Digital Pathology; Image Processing; Whole Slide Images; Angiogenesis; Microvessels; Brain Tumour