An MRS recording – peaks give a measure of the concentration of different substances 

This fig shows a spectrum analysed in such a way as to enhance the signal from the specific resonances in the GABA molecule. The area under the GABA peak represents its concentration in the large occipital voxel shown. Other peaks can be defined that represent other molecules such as glutamate, creatinine, choline and N-acetylaspartate.

Source. David Nutt, Imperial College London.

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