Fig. 1From: Assessment of axial spondyloarthritis activity using a magnetic resonance imaging-based multi-region-of-interest fusion modelWorkflow of the study. Manual segmentation and automatic expansions were performed on SIJ-MRIs to generate two ROIs, Circle and Facet. Different features were extracted, then selected by various methods, including cross-validation, LASSO, and MSE. Different predictive models were constructed using these features. Their performance was assessed using the ROC, decision, and calibration curvesBack to article page