نتایج جستجو برای: arterial input function
تعداد نتایج: 1503223 فیلتر نتایج به سال:
PURPOSE To measure the arterial input function (AIF) in a mouse tail at high temporal resolution with signal phase of MR projections. METHODS The technique involves the acquisition of one 2D image before injection, followed by a series of projections before, during, and after contrast injection. Differences in the signal phase, relative to the mean preinjection phase, were calculated and conv...
Performing quantitative small-animal PET with an arterial input function has been considered technically challenging. Here, we introduce a catheterization procedure that keeps a rat physiologically stable for 1.5 mo. We demonstrated the feasibility of quantitative small-animal 18F-FDG PET in rats by performing it repeatedly to monitor the time course of variations in the cerebral metabolic rate...
Characteristic neuropathologic changes in Alzheimer disease (AD) are amyloid-β deposits and neurofibrillary tangles. Recently, a new radioligand for amyloid senile plaques, 11C-labeled 5-(6-{[tertbutyl(dimethyl)silyl]oxy}-1,3-benzothiazol-2-yl)pyridin-2-amine (11CAZD2184), was developed, and it was reported to show rapid brain uptake followed by rapid washout. In this study, 11C-AZD2184 binding...
the present study was conducted to investigate the effect of implicit focus on form through input flooding and the effect of noticing, explicit focus on form on linguistic accuracy. to fulfill the purpose of the study, 86 iranian pre-intermediate efl learners of one of the language institutes were chosen by means of administering ket as the homogeneity test. these learners were pretested throug...
BACKGROUND We present a method for extracting arterial input functions from dynamic [18F]FLT PET images of the head and neck, directly accounting for the partial volume effect. The method uses two blood samples, for which the optimum collection times are assessed. METHODS Six datasets comprising dynamic PET images, co-registered computed tomography (CT) scans and blood-sampled input functions...
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