X-ray Imaging Using a Hybrid Photon Counting GaAs Pixel Detector

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dc.creatorSchwarz, C.
dc.creatorCampbell, M.
dc.creatorGoeppert, R.
dc.creatorHeijne, E. H. M.
dc.creatorLudwig, J.
dc.creatorMeddeler, G.
dc.creatorMikulec, B.
dc.creatorPernigotti, E.
dc.creatorRogalla, M.
dc.creatorRunge, K.
dc.creatorSoldner-Rembold, A.
dc.creatorSmith, K. M.
dc.creatorSnoeys, W.
dc.creatorWatt, J.
dc.date1998-12-21
dc.date.accessioned2026-07-07T13:01:48Z
dc.date.available2026-07-07T13:01:48Z
dc.descriptionThe performance of hybrid GaAs pixel detectors as X-ray imaging sensors were investigated at room temperature. These hybrids consist of 300 mu-m thick GaAs pixel detectors, flip-chip bonded to a CMOS Single Photon Counting Chip (PCC). This chip consists of a matrix of 64 x 64 identical square pixels (170 mu-m x 170 mu-m) and covers a total area of 1.2 cm**2. The electronics in each cell comprises a preamplifier, a discriminator with a 3-bit threshold adjust and a 15-bit counter. The detector is realized by an array of Schottky diodes processed on semi-insulating LEC-GaAs bulk material. An IV-charcteristic and a detector bias voltage scan showed that the detector can be operated with voltages around 200 V. Images of various objects were taken by using a standard X-ray tube for dental diagnostics. The signal to noise ratio (SNR) was also determined. The applications of these imaging systems range from medical applications like digital mammography or dental X-ray diagnostics to non destructive material testing (NDT). Because of the separation of detector and readout chip, different materials can be investigated and compared.
dc.description6 pages, 7 figures, uses espcrc2.sty, submitted to Proc. of 6th Int. Conference on Advanced Technology, and Particle Physics, Villa Olmo, Como, Italy, 5-9 October 1998, to be published in Nucl. Phys. B (Proc. Supplements)
dc.identifierhttps://arxiv.org/abs/physics/9812039
dc.identifierhttp://arxiv.org/abs/physics/9812039
dc.identifierNucl.Phys.Proc.Suppl.78:491-496,1999
dc.identifierdoi:10.1016/S0920-5632(99)00592-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226268
dc.subjectInstrumentation and Detectors
dc.subjectMedical Physics
dc.titleX-ray Imaging Using a Hybrid Photon Counting GaAs Pixel Detector
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