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FIG 5.
TSI findings in a 38-year-old man in whom radiation injury was established on biopsy samples.
A–C, The location of an SVS volume is indicated on an axial inversion-recovery image (A) and a coronal T1-weighted image (B). The locations from which spectra were extracted from the TSI data are also shown on an inversion-recovery image (C).
D, The spectra (top, SVS results; middle, TSI of lesion; bottom, TSI from contralateral hemisphere for reference) show very low levels of Cho, Cr, and NAA, and indicate the presence of lactate within the lesion. Correspondence between the SVS and TSI data was considered to be very good. The lactate peak on TSI was substantially larger than on SVS, which was a common finding. The lactate peak appears as an inverted doublet on SVS and an unresolved positive peak on TSI as a result of differences in echo time and limitations in the TSI spectral resolution.
E–H, The spectral images obtained by integrating the area under the Cho (E), Cr (F), NAA (G), and lactate (H) peaks are also shown. Anatomic contours obtained from the inversion-recovery image (C) are overlaid
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