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Fig. 3
Estimate of the limiting concentration needed for the acquisition of an 19F MRI image. The signal/noise ratios of 1024 repetitions were measured for peptides P1–P6 at different concentrations in PBS buffer (in 5 mm tubes) using solution 19F NMR at 7 T (300 MHz 1H resonance frequency). A signal/noise ratio of ≈10 000 (marked by a dashed line) is estimated to be sufficient to collect a 19F MRI image (2D slice of 64 × 64 matrix) within 10 min.
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