Figure 4. Centre: T₂ weighted transverse image of prostate with tumour in right mid-gland, overlain with grid of voxels from which spectra were acquired. Left: Spectrum acquired from region of tumour, illustrating dramatically elevated choline and absence of citrate and polyamines. Right: Spectrum from healthy peripheral zone tissue with high citrate and presence of polyamines. (Reproduced with permission from J Kurhanewicz et al [46]).