Am I right in assuming that I could obtain absolute, tissue corrected choline concentration by performing the same calculations that is done for GABA but on Choline area under curve, that is to obtain a “ConcIU_CSFcorr” for choline?
So this would involve finding a reference for the constants then. I found Li et al (2013) JMID but if anyone knows of a more suitable reference I am open to suggestions.
However, I am afraid I cannot figure out what N_H_Metab represents.
The N_H_Metab constant is the number of hydrogen protons that give rise to the signal of interest. For the 3.2 ppm Cho peak, there are 9 protons. You need to account for this as the signal areas scale with the number of hydrogen protons.
Please see the Gannet documentation website for further details of all the variables.