Fig. 4: Observed T2 relaxation decay rate \({R}_{2}^{{{{{{\rm{obs}}}}}}}\) as a function of τ (echo time is 2τ). | Nature Communications

Fig. 4: Observed T2 relaxation decay rate \({R}_{2}^{{{{{{\rm{obs}}}}}}}\) as a function of τ (echo time is 2τ).

From: Spying on parahydrogen-induced polarization transfer using a half-tesla benchtop MRI and hyperpolarized imaging enabled by automation

Fig. 4

For each τ, 169 echoes were acquired in a single 90o-CPMG sequence. A monoexponential decay function fitted to the data was used to determine \({R}_{2}^{{{{{{\rm{obs}}}}}}}\) for each τ (Eq. 1, circles with whiskers indicating standard deviation). These transversal relaxation rates were fitted with \({R}_{2}^{{{{{{\rm{obs}}}}}}}=\frac{1}{{T}_{2}}+{D}^{*}{\left(2\tau \right)}^{2}\) for τ ≤ 170 ms (red line), resulting in \(\frac{1}{{T}_{2}}=\left(0.262\pm 0.001\right)\) s−1 or \({T}_{2}=\left(3.81\pm 0.01\right)\) s and \({D}^{*}=\left(13.4\pm 0.2\right)\) s−1. Sample: the 10 mm tube with 300 μL of acetone-h6; the entire sample was inside the B1 coil. Each measurement was repeated three times, after which the results were averaged (symbols).

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