Fig. 5From: Dual-energy CT virtual non-calcium: an accurate method for detection of knee osteoarthritis-related edema-like marrow signal intensityMean CT numbers of positive and negative ELMSI, with Grade 3–4 ELMSI as a positive result and Grade 1–2 ELMSI as a negative result according to MRI; 1 and 2 in the figure represent Reader 1 and Reader 2Back to article page