Title :
Compact high resolution detector for small animal SPECT
Author :
Schramm, N. ; Wirrwar, A. ; Sonnenberg, F. ; Halling, H.
Author_Institution :
Zentrallabor fur Elektron., Forschungszentrum Julich GmbH, Germany
fDate :
6/1/2000 12:00:00 AM
Abstract :
Presents a high-resolution detector for small animal SPECT and the scintigraphic examination of human extremities or scintimammography. The system consists of a 2 mm NaI (T1) 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 8.7%. 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 8.8 cps/MBq. Using an iterative reconstruction algorithm the tomographical resolution (in water) amounts to 2.7 mm. When using a pinhole collimator (1.1 mm aperture) the system resolution at 30 mm improves to 1.4 mm and the sensitivity increases by a factor of 3.2 to an absolute value of 27.9 cps/MBq
Keywords :
biological techniques; image reconstruction; image resolution; iterative methods; photomultipliers; single photon emission computed tomography; 1.1 mm; 140 keV; 30 mm; 5 in; compact high resolution detector; energy resolution; human extremities; iterative reconstruction algorithm; pinhole collimator; scintigraphic examination; scintimammography; small animal SPECT; source distance; system resolution; tomographical resolution; Animals; Apertures; Collimators; Detectors; Energy resolution; Extremities; Humans; Photomultipliers; Reconstruction algorithms; Spatial resolution;
Journal_Title :
Nuclear Science, IEEE Transactions on
