Fig. 2

Distributions of lesion properties. Properties of colour-coded DECT lesions in gout patients. The distributions of DECT ratios have been overlaid with a normal distribution curve with a mean at the local maxima at a DECT ratio of 1.06 and a standard deviation estimated from points below this mean to be 0.10. Notice that the right tail on the DECT ratios is heavy with more lesions having a high DECT ratio than expected by a Gaussian distribution in agreement with a mixture of monosodium urate depositions and calcium-containing material. DECT, dual-energy computed tomography; DECT ratio, HU at 80 kV/HU at 150 kV (with tin filter); HU, Hounsfield units; size, numbers of voxels