Fig. 7.
Spearman correlation analysis of tracer uptake for lesions with focal uptake (tumours, metastatic lymph nodes, metastases and benign focal uptake; a SUVmean, b SUVmax) shows strong positive monotonic correlations for both SUVmean and SUVmax from PET/MR and those from PET/CT. SUVmean ρ = 0.872, n = 202, p < 0.001; SUVmax ρ = 0.843, n = 202, p < 0.001. Bland-Altman plots of SUVmean (c) and SUVmax (d) for lesions with focal uptake on PET/MR and PET/CT. Differences and limits of agreement (bias ± 2SD) are expressed as a function of the average SUVs from PET/MR and from PET/CT. The systematic underestimation of SUVs from PET/MR is proportional to the SUV. Note the dispersion of the data for SUVmean >10 and SUVmax >12