Short-time-window Patlak imaging using a population-based arterial input function and optimized Bayesian penalized likelihood reconstruction: a feasibility study

EJNMMI Research

Table 3 κ values for inter-observer agreement for Ki parameters

	κ value^a
Individual patient-based Ki image
Ki-max	0.94 (95% CI = 0.91–0.97)
Ki-mean	0.94 (95% CI = 0.92–0.97)
Ki-volume	0.78 (95% CI = 0.67–0.89)
Population-based Ki image
Ki-350 images
Ki-max	0.81 (95% CI = 0.71–0.90)
Ki-mean	0.87 (95% CI = 0.80–0.94)
Ki-volume	0.76 (95% CI = 0.66–0.86)
Ki-700 images
Ki-max	0.84 (95% CI = 0.77–0.91)
Ki-mean	0.92 (95% CI = 0.89–0.96)
Ki-volume	0.75 (95% CI = 0.64–0.85)
Ki-1000 images
Ki-max	0.83 (95% CI = 0.75–0.91)
Ki-mean	0.90 (95% CI = 0.85–0.94)
Ki-volume	0.86 (95% CI = 0.80–0.92)

Ki-max, Maximum Ki; Ki-mean, Mean Ki; Ki-volume, Volume of Ki; and CI, Confidence interval
^aNumbers in parentheses are 95% confidence intervals