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The Brain Imaging Centre, Montreal Neurological Institute, McGill University, Montreal, Canada
Correspondence: For reprints contact: Jane L. Tyler, MD, Brain ImagingCentre, Montreal Neurological Institute, 3801 University St., Montreal, Quebec, H3A 2B4.
ABSTRACT
Cerebral glucose utilization (LCMRGI)was measured using the [18F]fluorodeoxyglucose method with PET in two groups of ten healthy young volunteers, each scanned in a resting state under different methodological conditions. In addition, five subjects had a second scan within 48 hr. Mean hemispheric values averaged 45.8 ± 3.3 µmol/100 g/min in the right cerebral hemisphere and 47.0 ± 3.7 µmol/100 g/min in the left hemisphere. A four-way analysis of variance (group, sex, region, hemisphere) was carried out on the results using three different methods of data manipulation: (a) the raw values of glucose utilization, (b) LCMRGI values "normalized" by the mean hemispheric gray matter LCMRGI value and (c) log transformed LCMRGI values. For all analysis techniques, significantly higher LCMRGI values were consistently seen in the left mid and posterior temporal area and caudate nucleus relative to the right, and in the right occipital region relative to the left. The coefficient of variation of intrasubject regional differences (9.9%) was significantly smaller than the coefficient of variation for regions between subjects (16.5%). No differences were noted between the sexes and no effect of repeat procedures was seen in subjects having multiple scans. In addition, inter-regional LCMRGI correlations were examined both in values from the 20 normal subjects, as well as in a set of hypothetical "abnormal" values. Results were compared with those reported from other PET centers; despite certain methodological differences, the intersubject and inter-regional variation of LCMRGI is fairly constant.
FOOTNOTES
Preliminary results presented at the XII International Symposium on Cerebral Blood Flow and Metabolism, Lund/Ronneby, Sweden, June 16–20, 1985.
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