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Published byBarnaby Stewart Modified over 9 years ago
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HYBRID IMAGING
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Combination Nuclear medicine Radiology PET/CT Positron emission tomography Computed tomography SPECT/CT Single photon emission tomography Computed tomography PET/MRI
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e-e- e+e+ Beta plus decay Nucleus reach of protons Proton is transformed to neutron Emission of positron and neutrino Periodical table shift to the left by one site 18F to18O Positron is living only few ms Annihilation of the matter Interaction of electron and positron Gamma rays 2 quanta E – 511 keV Unique energy Angle180o 18 0 511 keV 18 F
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PET/CT scanner
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Radiopharmaceuticals 18F halftime110 min 18FDG – fluorodeoxyglucose 18FLT – fluorothymidine Na18F 18F-Estradiol, 18F-methionin, 18F-DOPA, 18F-cholin 68Ga halftime 68 min DOTA derivates somatostatine analoga 11C halftime 20 min 11C-acetate, 11C-cholin 13N (9 min), 15O (123 s), 82Rb (78 s)
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Imaging technique Application of radiofarmaka Oral preparation 1000 ml 2,5% manitol CT data acquisition PET data acquisition 7 positions per 3 min
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2,5% mannitol Oral preparation
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Postprocessing fusion CT + PET Multiple colorectal cancer
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18 F-fluorodeoxyglucose plasmacell transportphosphorylationglycolysis glucose 18 F-FDG 18 F-FDG-6-P glucose-6-P glycolysis glucose 18 F-FDG
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18 FDG-PET/CT Increased uptake Tumorous tissues with increased glycolytic activity Inflammatory reaction Physiological uptake brain Brown fatty tissue Stripped muscles Kidneys Sallivary glands
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staging Bronchogenic carcinoma Head and neck tumours Lymfoma Melanoblastoma
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BRCA
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BRCA
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Cerebral lymphoma
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Hodgkin disease
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Therapy strategy Sarcoma tendinis Achill. Leiomyosarkoma Synovial sarcoma
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Restaging Therapy response effect Definitive In the middle between cycles
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Oropharyngeal cancer 18 months after
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Early after surgery 3 months later
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Cervical cancer Before th After th myom myom Ca Ca
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Grading the assesment of the biologic activity More dedifferenciated – higher FDG uptake
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Low-grade astrocytoma
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Anaplastic oligodendroglioma
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Fever of unknown origin M. Hodgkin
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Blastic turnover of the osteomyelofibrosis
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Microscopic polyarteritis
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18 F-fluorothymidine replication DNA = cellular proliferation Fast dividing cells Tumors Bone marrow Germinative zones of lymph nodes Therapy monitoring – RT, CHT
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indications
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18 F-natriumfluoride Bone turnover fluoroapatite Osteoblastic activity Osteoplastic bone metastases Ca prostate Ca breast Ca lungs Bony tumors
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Indications
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