Fig. 9: Image encoding and reading with ¹⁹F MRI (4.7 T).

A Distribution pattern of M¹M²-TP1 compounds encoded with Dy³⁺/Ho³⁺ ions within a 7 × 5-well plate (final concentrations ∼0.36 mM each compound, well volumes completed to 75 μL with water). B ¹⁹F MR spectrum obtained from the entire well plate shows four distinct peaks of the four encoded compounds (marked with triangles, color-coding as explained in A). The spectrum was created by projecting the maximum signal intensity from each slice of (CSI) MRI data onto the frequency dimension. The spectral resolution was 19.2 Hz (0.10 ppm) per slice. C–F Selective display of HoDy-TP1 (C), DyDy-TP1 (D), HoHo-TP1 (E) and DyHo-TP1 (F) compounds reveals the patterns encoded with them into the well plate as legible letters (average of 15 adjacent slices for each compound peak). Displayed field of view: 50×50 mm, voxel size 0.78 × 0.78 × 10 mm. Image intensities were mapped to colors as shown in the legends. See also Supplementary Movie 1 for a fly-through view of the MRI data.