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Fig. 3. —Patterns of spectral degradation from lipid contamination and
motion artifact. Top image is from 65-year-old man with negative findings on
prostate biopsy, and bottom image is from 68-year-old man with Gleason-score-6
tumor at right base. Spectra on top are obtained from left base location
(small rectangle) of adjacent T2-weighted axial image
(TR/TEeff, 5,000/96) and are examples of spectral degradation from
periprostatic lipid contamination as shown by presence of large lipid peak.
Spectra on bottom are obtained from left base location (small
rectangle) of adjacent T2-weighted axial image (5,000/96) and are
examples of spectral degradation from motion artifact as shown by broad
metabolite peaks and frequency shift of lipid peak that overlaps citrate
peak.
