Color-map recommendation for MR relaxometry maps

To harmonize the use of color for MR relaxometry maps and therefore recommend the use of specific color-maps for representing $T_1$ , $T_2$ , and $T_2^{*}$ maps and their inverses.

Perceptually linearized color-maps were chosen to have similar color settings as those proposed by Griswold et al. in 2018. A Delphi process, polling the opinion of a panel of 81 experts, was used to generate consensus on the suitability of these maps.

Consensus was reached on the suitability of the logarithm-processed Lipari color-map for $T_1$ and the logarithm-processed Navia color-map for $T_2$ and $T_2^{*}$ . There was consensus on color bars being mandatory and on the use of a specific value indicating "invalidity." There was no consensus on whether the ranges should be fixed per anatomy.

The authors recommend the use of the logarithm-processed Lipari color-map for displaying quantitative $T_1$ maps and $R_1$ maps; likewise, the authors recommend the logarithm-processed Navia color-map for displaying $T_2$ , $T_2^{*}$ , $R_2$ , and $R_2^{*}$ maps. This work originated with the Quantitative MR Study Group of the International Society of Magnetic Resonance in Medicine (ISMRM); it has the approval of the Publication Committee and of the Board of the ISMRM.