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pubmed-article:9001146pubmed:abstractText1H MR spectra obtained by chemical shift imaging (CSI) of contrast-enhancing brain tumors before and after the administration of Gd-contrast agent were quantitated and compared with the results in normal brain tissue included in the volume of interest. Twenty-seven combined magnetic resonance imaging and spectroscopy (MRI, MRS) examinations of brain tumor lesions included T1-weighted MRI and CSI (TR/TE 1500/135 ms double-spin echo) repeated 5-10 min after the administration of Gd-contrast agent (0.1-0.2 mM). In 1H MR spectra of contrast-enhancing tumor Gd-contrast induced a mean loss of 15% of the peak area of choline-containing compounds (Cho, P < 0.001) that was correlated with precontrast Cho linewidth (r = -0.72, P < 0.00001). This phenomenon limits the diagnostic use of brain tumor MRS examinations performed immediately after contrast-enhanced MRI.lld:pubmed
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pubmed-article:9001146pubmed:articleTitle1H chemical shift imaging reveals loss of brain tumor choline signal after administration of Gd-contrast.lld:pubmed
pubmed-article:9001146pubmed:affiliationDr. Daniel den Hoed Cancer Center, Department of Radiology, University Hospital Rotterdam, The Netherlands.lld:pubmed
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