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Table 3 Spearman rank correlation coefficients and areas under ROC curves showing agreement between objective and subjective assessments of image quality

From: Patient-specific optimisation of administered activity and acquisition times for 18F-FDG PET imaging

Objective measure Spearman rank correlation coefficient Area under the ROC curve for identifying images which are “definitely adequate” or better
Value 95% confidence interval p value for difference from NECpatient Value 95% confidence interval p value for difference from NECpatient
SNRliver 0.74 0.68–0.78 0.43 0.90 0.86–0.93 0.03
SNRAA 0.60 0.52–0.66 <0.01 0.82 0.77–0.86 <0.01
NECpatient 0.77 0.72–0.81   0.94 0.91–0.96  
NECdensity 0.73 0.68–0.78 0.35 0.91 0.88–0.94 0.01