qMRI Colormap standardization

[mathieuboudreau]

There's been a lot of efforts suggesting the use of different colormaps for specific qMRI parameters.

Specifically, ISMRM qMRI Study Group suggests lipari for T1 and navia for T2, and their inverses for R1 and R2

• https://cig-utrecht.org/blog/2023/11/27/colormap-relaxometry.html#:~:text=We%20recommend%20that%20the%20Lipari,used%20for%20T2%20and%20T2*.
• https://arxiv.org/abs/2407.03906

I've not been able to find any for B0 and B1, but I've always had a strong preference to use a Blue-White-Red scheme where blue is values below 0 for B0 and below 1 for B1, white is 0 and 1 respectively for both, and red for above those numbers. It makes it much easier to interpret the regions that are the nominal values (0 or 1), and blue/red is also easy to interpret via the cold/hot scheme. But, using the same for both B0 and B1 might also lead to confusion, but I'd prefer still some kind of (color 1)-white-(color 2) scheme for these style of images for the reasons above; setting a linear gradient scheme always it makes it so hard to figure out the "nominal" regions for B0 and B1 imo

[mathieuboudreau]

re: B0/B1, it's a diverging gradient, here are some more:

https://s-ink.org/scientific-colour-maps

[mathieuboudreau]

For T2/T1, these are the recommended ones:
https://github.com/mfuderer/colorResources
https://www.mathworks.com/matlabcentral/fileexchange/169291-colormap-for-mr-relaxometry