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Fig. 1 | EJNMMI Research

Fig. 1

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

Fig. 1

Plasma parent fraction data and fit. Plasma parent fraction for a test scan and b retest scan for each subject. Symbols represent ratio of parent compound, [13N]ammonia, to total 13N labelled fractions (parent plus metabolites) measured from individual arterial plasma samples. Lines show biexponential fits to subject/scan data sets. Coloured lines and circles show colour-coded subjects 1–5 used in the full analysis (blue, green, red, magenta and cyan, for subjects 1–5, respectively). Black symbols and lines (triangle/solid, square/dashed, diamond/dotted for subjects 6–8, respectively) show subjects 6–8 considered corrupted data. X-axis is time in minutes from injection (corrected for brain-detector delay). Y-axis is plasma parent fraction in percent

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