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EJNMMI Research
Fig. 3 | EJNMMI Research

Fig. 3

From: Evaluation of [ 13 N]ammonia positron emission tomography as a potential method for quantifying glutamine synthetase activity in the human brain

Fig. 3

CBF vs K1 correlations. Plots showing association across 78 ROIs of K1 (y-axis) from model fits of [13N]ammonia data with CBF (x-axis) from paired [15O]H2O scans within each subject (1–5) and for scans 1 and 2. Lines show line of best fit (zero intercept). Subjects 1–5 are coded with symbol type and colour. Solid symbols and solid lines show scan 1, open symbols and dashed lines scan 2. a K1 calculated from irreversible 2TCM; b K1 calculated from reversible 1TCM; c Kmet calculated from Patlak plot. CBF is calculated using the Meyer [27] model described in the manuscript

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