Katherine S Morrison

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UNLABELLED The reproducibility of (+/-)-alpha-[11C] dihydrotetrabenazine (DTBZ) measures in PET was studied in 10 healthy human subjects, aged 22-76 y. METHODS The scan-to-scan variation of several measures used in PET data analysis was determined, including the radioactivity ratio (target-to-reference), plasma-input Logan total distribution volume (DV),(More)
UNLABELLED The reproducibility of [11C]SCH 23390 in PET was studied in 10 normal human subjects. METHODS The scan-to-scan variation of several measures used in PET data analysis, including the radioactivity ratio, plasma-input Logan total distribution volume (DV), plasma-input Logan DV ratio (DVR) and tissue-input Logan Bmax/Kd values, was determined. (More)
The uptake rate constant and the loss rate constant that expresses the reversibility of the uptake process of 6-[18F]fluoro-L-Dopa (FDOPA) were measured by positron emission tomography in the striatum of normal rhesus monkeys and in monkeys with unilateral lesions of the dopaminergic nigro-striatal pathway, induced by intracarotid injection of(More)
The consequences of monoamine oxidase and catechol-O-methyltransferase inhibition on the effective turnover of dopamine were investigated using 6-[18F]L-3-4-dihydroxyphenylalanine (6-[18F]L-DOPA) and positron emission tomography. The effective dopamine turnover was expressed as the ratio between the rate of reversibility of 6-[18F]L-DOPA trapping (k[loss])(More)
Cynomolgus and rhesus monkeys have been studied via PET with [18F]-L-6 fluorodopa tracer. Striatal fluorodopa uptake rate constants have been derived by graphical analysis of transaxial slice images centered on the striata. The differences between pairs of values of the rate constant, obtained from two scans on the same monkey separated by two weeks or(More)
OBJECTIVE To test the effectiveness of a non-pharmaceutical programme for obese participants in a rural Eastern Canadian Province using certified health professionals. DESIGN A prospective quasi-experimental design with repeated premeasure and postmeasure. PARTICIPANTS 146 participants with obesity (body mass index >30 kg/m(2)) from rural and urban(More)
The aim of this study was to explore the possibility of identifying clusters of children's games based on estimated energy expenditures and (or) intensity when performed in a guided active play format. The study also investigated whether the identified active play game clusters were repeatable when the games were performed on different days. Children (9.7 ±(More)
The human striatum is small enough for partial volume effects to be important when imaged in positron tomographs with slice widths 10 mm or greater. The combination of interslice distance and slice width in such tomographs results in an axial undersampling of the striatal activity which introduces the additional problem of variation of axial recovery as a(More)
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