Yy. Hsu et al., Proton MR spectroscopy in patients with complex partial seizures: Single-voxel spectroscopy versus chemical-shift imaging, AM J NEUROR, 20(4), 1999, pp. 643-651
Citations number
29
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Neurosciences & Behavoir
BACKGROUND AND PURPOSE: Proton MR spectroscopy has recently been applied to
the evaluation of seizures, but few comparisons have been made between dif
ferent clinical spectroscopic techniques. Our goal was to determine whether
there is a significant difference between hippocampal NAA/(Cho+Cr) ratios
obtained by single-voxel spectroscopy (SVS) and by chemical-shift imaging (
CSI).
METHODS: Twelve healthy adults and eight patients with complex partial seiz
ures were studied on a 1.5-T MR scanner using a proton SVS method. Another
12 healthy adults and 10 patients with complex partial seizures were recrui
ted for a proton CSI study, which was performed on a different 1.5-T MR sys
tem. The NAA/(Cho+Cr) ratio was calculated from the integral peak areas by
curve fitting. The two-tailed t-test was used for statistical analysis.
RESULTS: The mean value +/- standard deviation of the hippocampal NAA/(ChoCr) ratio in healthy control subjects was 0.63 +/- 0.07 by SVS, with 0.62 /- 0.15 for the anterior hippocampus and 0.65 +/- 0.11 for the posterior hi
ppocampus by CSI, There was no significant difference between the control g
roup data obtained by SVS and those by CSI, nor was there a regional differ
ence in the CSI NAA/(Cho+Cr) ratio in the hippocampus, Relative to the cont
rol group, the patients with seizures had a significant decrease in the NAA
/(Cho+Cr) ratio in the abnormal hippocampus: -28% by SVS, and -24% in the a
nterior hippocampus and -18% in the posterior hippocampus by CSI, Proton SV
S and CSI detected hippocampal abnormalities, unilateral or bilateral, in a
ll patients of each group.
CONCLUSION: Under similar measurement conditions, proton SVS and CSI provid
e similar NAA/(Cho+Cr) ratios among healthy control subjects, and they poss
ess comparable ability for detecting hippocampal abnormalities in patients
with complex partial seizures.