Title :
Portable digital X-ray and gamma-ray imaging system with pinhole and coded mask collimators
Author :
Sudarkin, A.N. ; Ivanov, O.P. ; Stepanov, V.E. ; Urutskoev, L.I.
Author_Institution :
RECOM Ltd., Moscow, Russia
Abstract :
The system is based on combined detector: scintillating plate+image intensifier+CCD matrix. The sensitivity of the detector allows the detection of single photon with energy higher than 60 keV. With pinhole collimator (total field of view is 20×20 degrees, angular resolution is 1.2 degree) system detects the minimum activity of 7.4 MBq (Cs-137 point source) at 1 m distance in 2 min. and SNR=5. For CsI(TI) scintillator of thickness of 1 mm detector´s special resolution is 0.5 mm. The hexagonal URA masks of ranks 6 and 9 are used for coded mask imaging; transparent elements of mask are cylindrical holes of diameter 1.3-2.2 mm (the steps of hexagonal structure are 2-2.5 mm). The images of the same objects obtained with pinhole collimator and coded masks show fivefold increase of sensitivity in last case
Keywords :
CCD image sensors; biomedical equipment; diagnostic radiography; gamma-ray applications; image resolution; radioisotope imaging; 1 m; 1.3 to 2.2 mm; 2 min; 7.4 MBq; CCD matrix; Cs; CsI:Tl; angular resolution; coded mask collimators; image intensifier; medical diagnostic imaging; medical instrumentation; pinhole collimators; portable digital X-ray/gamma-ray imaging system; scintillating plate; Collimators; Detectors; Head; Image intensifiers; Image resolution; Insulation; Optical imaging; Signal to noise ratio; Time measurement; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium, 1997. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-4258-5
DOI :
10.1109/NSSMIC.1997.670621
