Neurodegenerative Diseases Clinical Trial
Official title:
Creation of a Database of PET Digital Brain Exams, Adapted to a Population Aged 50 Years and Over, to Help in the Interpretation of Fluoro Desoxy Glucose (FDG) Labelled With Fluor 18 (18F-FDG) PET/CT (Computer Tomography) Exam
This study evaluate the interest to create a new database of PET digital brain exams in population of 50 years and over of patients. Half of patients with no abnormal brain metabolism while the other half patients with Alzheimer's disease.
The 18F-FDG cerebral PET can be performed for the detection of neurodegenerative diseases found hypometabolism in the areas concerned (Alzheimer's disease, fronto-temporal dementia, dementia Lewy body etc). The diagnosis is given by the clinician with a visual analysis of the data. Technical aids are now recommended (European recommendations) to complete the diagnosis with a quantitative analysis of different brain regions to a healthy brain base, to guide the diagnosis, in addition to visual analysis. The emergence of a new technology has allowed the transition from analog PET / CT to digital PET / CT improving spatial resolution and image contrast. Unlike analog PET / CT that uses photomultipliers to detect light, digital PET / CT uses the digital photon counting technique to directly convert light into a digital signal and each crystal is connected to a single detector. Different software, used in clinical routine, gives access to a quantified analysis of different areas of the brain. However, these programs have been made with healthy subjects of reduced strength (for example, the Neuro Q ® software database is based on 29 healthy patients), with no specific age and thanks to analog PET / CT ( old generation). There is therefore a low specificity in terms of detection of degenerative pathologies, this being explained by a decrease in cerebral metabolism with age 9, mainly at the level of the anterior areas 10 (frontal lobe, temporopolar areas, insular areas, cortex anterior cingulate). ;
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