Title :
An ISPA-camera for gamma rays
Author :
Puertolas, D. ; Piedigrossi, D. ; Pani, R. ; Leutz, H. ; De Notaristefani, F. ; D´Ambrosio, Ciriaco
Author_Institution :
CERN, Geneva, Switzerland
fDate :
12/1/1995 12:00:00 AM
Abstract :
With the recently developed ISPA (imaging silicon pixel array)-tube attached either to a planar YAlO3(Ce) (YAP) disc (1 mm thick) or to a matrix of optically-separated YAP-crystals (5 mm high, 0.6×n.6 mm2 cross-section) we achieved high spatial resolution of 57Co-122 keV photons. The vacuum-sealed ISPA-tube is only 4 cm long with 3.5 cm diameter and consists of a photocathode viewed at 3cm distance by a silicon pixel chip, directly detecting the photoelectrons. The chip-anode consists of 1024 rectangular pixels with 73 μm×500 μm edges, each bump-bonded to their individual front-end electronics. The total pixel array read-out time is 10 ps. The measured intrinsic spatial resolutions (FWHM) of this ISPA-camera are 700 μm (planar YAP) and 310 μm (YAP-matrix). Apart from its already demonstrated application for particle tracking with scintillating fibers, the ISPA-tube provides also an excellent tool in medicine, biology, and chemistry
Keywords :
biomedical imaging; cameras; gamma-ray apparatus; position sensitive particle detectors; silicon radiation detectors; 0.6 mm; 1 mm; 122 keV; 3.5 cm; 4 cm; 5 mm; Co; ISPA-camera; Si; YAlO3:Ce; biology; chemistry; chip-anode; gamma ray camera; imaging Si pixel array tube; medicine; optically-separated YAP-crystals; particle tracking; photocathode; photoelectrons; planar disc; rectangular pixels; scintillating fibers; spatial resolution; total pixel array readout time; vacuum-sealed ISPA-tube; Biomedical optical imaging; Cathodes; Gamma rays; High-resolution imaging; Optical arrays; Optical imaging; Pixel; Silicon; Spatial resolution; Transmission line matrix methods;
Journal_Title :
Nuclear Science, IEEE Transactions on
