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. 2020 May 19;48(1):21–39. doi: 10.1007/s00259-020-04843-6

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© The Author(s) 2020

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Fig. 3 — Schematic presentation of the 2- and 3-compartment model with one input function. C_plasma is the tracer concentration in arterial blood. In the 2-tissue compartment, all tracer is transported in compartment C₁. For the 3-tissue compartment, two tracer forms in tissue are considered as C₁ and C₂. Compartment C₁ represents the free and nondisplaceable part of the tracer into the tissue, and compartment C₂ represents the specific bound part of the tracer (in case of ¹⁸F-FDG the phosphorylated tracer)