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Validation of reference tissue modelling for [11C]flumazenil positron emission tomography following head injury.

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Geeraerts, Thomas 
Coles, Jonathan P 
Aigbirhio, Franklin I 
Pickard, John D 
Menon, David K 


OBJECTIVE: [(11)C]Flumazenil ([(11)C]FMZ) positron emission tomography (PET) can be used as a measure of neuronal loss. The purpose of this study was to validate reference tissue kinetic modelling of [(11)C]FMZ PET within a group of patients with head injury. METHODS: Following earlier studies, the pons was used as the reference region. PET scans were performed on 16 controls and 11 patients at least 6 months following injury, each of whom also had arterial blood sampling to provide whole blood and metabolite-corrected plasma input functions. Regional non-displaceable binding potentials (BP(ND)) were calculated from five reference tissue models and compared to BP(ND) from arterial input models. For the patients, the regions included a peri-lesional region of interest (ROI). RESULTS: Total distribution volume of the pons was not significantly different between control and patient groups (P = 0.24). BP(ND) from all the reference tissue approaches correlated well with BP(ND) from the plasma input models for both controls (r (2) = 0.98-1.00; P < 0.001) and patients (r (2) = 0.99-1.00; P < 0.001). For the peri-lesional regions (n = 11 ROI values), the correlation was also high (r (2) = 0.91). CONCLUSIONS: These results indicate that reference tissue modelling with the pons as the reference region is valid for [(11)C]FMZ PET in head-injured patients at 6 months following injury within both normal appearing and peri-lesional brain regions.



Adult, Aged, Arteries, Carbon Radioisotopes, Craniocerebral Trauma, Female, Flumazenil, Humans, Kinetics, Male, Middle Aged, Models, Biological, Pons, Positron-Emission Tomography, Reference Standards, Young Adult

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Ann Nucl Med

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Springer Science and Business Media LLC
Medical Research Council (G0600986)
Medical Research Council (G0001237)
Medical Research Council (G9439390)
Medical Research Council (G0600986/1)