Title :
Compact high resolution detector for small animal SPECT
Author :
Schramm, N. ; Wirrwar, A. ; Sonnenberg, F. ; Halling, H.
Author_Institution :
Zentrallabor fur Elektronik, Forschungszentrum Julich GmbH, Germany
Abstract :
Presents a high-resolution detector for small animal SPECT and the scintigraphic examination of human extremities (scintimammography). The system consists of a 2 mm NaI(Tl) disk coupled to a 5" position sensitive photomultiplier (Hamamatsu, R3292) and an ultra high-resolution, parallel-hole collimator. The usable FOV of this detector has a diameter of 90 mm. The intrinsic spatial resolution is 1.4 mm FWHM and the energy resolution at 140 keV amounts to 8.5%. The system resolution is 1.8 mm FWHM close to the collimator and 2.5 mm at 30 mm source distance with a system sensitivity of 8.5 cps/MBq. Using an iterative reconstruction algorithm the tomographical resolution (in water) amounts to 2.7 mm. When using a pinhole collimator (1.2 mm aperture) the system resolution at 30 mm improves to 1.4 mm and the sensitivity increases by a factor of 3.3
Keywords :
biological techniques; biomedical equipment; image reconstruction; image resolution; iterative methods; mammography; medical image processing; photomultipliers; single photon emission computed tomography; 1.2 mm; 140 keV; 30 mm; 5 in; Hamamatsu R3292; NaI:Tl; compact high resolution detector; human extremities; iterative reconstruction algorithm; medical instrumentation; nuclear medicine; pinhole collimator; position sensitive photomultiplier; scintigraphic examination; scintimammography; sensitivity; small animal SPECT; system resolution; ultra high-resolution parallel-hole collimator; Animals; Apertures; Collimators; Detectors; Energy resolution; Extremities; Humans; Photomultipliers; Reconstruction algorithms; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium, 1999. Conference Record. 1999 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5696-9
DOI :
10.1109/NSSMIC.1999.842838
