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Fig. 11 —MR spectroscopy in 65-year-old man. Axial T2-weighted MR image shows prostate cancer presenting as low signal in peripheral zone on left (single arrow). Grid over prostate marks location where spectra were acquired. Increased choline (long arrows) and decreased citrate (short arrows) peaks are noted in boxes corresponding to region of decreased T2 signal. Spectrum suggesting prostate cancer is magnified on right. Normal spectrum with low choline and high citrate is magnified on left. Choline and creatine peaks are close and are usually difficult to separate on spectra.