Figure 1. Example of¹H MRS spectra from (a) normal brain and (b) brain stem tumour. The major peaks are from choline (Cho), Creatine (Cr), myo-Inositol (mI), N-acetyl aspartate (NAA) and lipids (lip). Repetition time (TR) = 1.5 s; echo time (TE) = 30 ms. Each spectrum shows acquired data (grey line), the fit (bold line) and fitted baseline. Note the increase in choline (Cho) and reduction in NAA in the tumour compared with normal brain.