EFEITOS DO COLIMADOR NA QUALIDADE DE IMAGEM EM TOMÓGRAFIA INDUSTRIAL DE TERCEIRA GERAÇÃO

摘要: The study of the effect collimation in radiation detectors on image quality third-generation industrial CT scanner developed at IPEN / CNEN-SP is described this work. Three sets lead collimators were designed and manufactured, one with rectangular windows 2 x 5 50 mm other 4 10 (width length deep) a third circular hole diameter 40 deep. to be easily interchanged detectors. In parallel, prepared used associated electronics, consisting multi-channel signal analyzers type 8 bits containing high voltage unit amplifier. Among advantages system stands out for its ability fast multichannel analysis possess simpler electronics. Values energy resolution comparable literature found using electronics coupled detector NaI (Tl). effects evaluated by tomographic measurements multiphase fantom polymethyl methacrylate static components (iron, aluminum air). Radiation sources energies Se (97 keV, 121 136 265 279 keV 400 keV), Cs (662 keV) Ir (317 468 602 observed that best was obtained (slits) mm. dynamic evaluation formation bubbles column simulated processes source.