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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: J Thorac Oncol. 2013 Apr;8(4):452–460. doi: 10.1097/JTO.0b013e3182843721

Figure 2.

Figure 2

Natural clustering of HRCT regions of interest (ROI) of lung nodules. Panel A shows representative ROIs selected from different nodules in the training set. Each of the 774 ROI were compared with each other to derive the pairwise 774×774 similarity matrix and color coded (Panel B) such that the darkness is proportional to the similarity. Panel C shows the similarity matrix in the Affinity Propagation based clustered space wherein the arbitrarily color-coded diagonal sub-blocks show the automatically computed natural clusters.