dorsal/arxiv
View SchemaX-ray Imaging Using a Hybrid Photon Counting GaAs Pixel Detector
| Authors | C. Schwarz, M. Campbell, R. Goeppert, E. H. M. Heijne, J. Ludwig, G. Meddeler, B. Mikulec, E. Pernigotti, M. Rogalla, K. Runge, A. Soldner-Rembold, K. M. Smith, W. Snoeys, J. Watt |
|---|---|
| Categories | |
| ArXiv ID | physics/9812039 |
| URL | https://arxiv.org/abs/physics/9812039 |
| DOI | 10.1016/S0920-5632(99)00592-7 |
| Journal | Nucl.Phys.Proc.Suppl.78:491-496,1999 |
Abstract
The 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.
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"abstract": "The performance of hybrid GaAs pixel detectors as X-ray imaging sensors were\ninvestigated at room temperature. These hybrids consist of 300 mu-m thick GaAs\npixel detectors, flip-chip bonded to a CMOS Single Photon Counting Chip (PCC).\nThis chip consists of a matrix of 64 x 64 identical square pixels (170 mu-m x\n170 mu-m) and covers a total area of 1.2 cm**2. The electronics in each cell\ncomprises a preamplifier, a discriminator with a 3-bit threshold adjust and a\n15-bit counter. The detector is realized by an array of Schottky diodes\nprocessed on semi-insulating LEC-GaAs bulk material. An IV-charcteristic and a\ndetector bias voltage scan showed that the detector can be operated with\nvoltages around 200 V. Images of various objects were taken by using a standard\nX-ray tube for dental diagnostics. The signal to noise ratio (SNR) was also\ndetermined. The applications of these imaging systems range from medical\napplications like digital mammography or dental X-ray diagnostics to non\ndestructive material testing (NDT). Because of the separation of detector and\nreadout chip, different materials can be investigated and compared.",
"arxiv_id": "physics/9812039",
"authors": [
"C. Schwarz",
"M. Campbell",
"R. Goeppert",
"E. H. M. Heijne",
"J. Ludwig",
"G. Meddeler",
"B. Mikulec",
"E. Pernigotti",
"M. Rogalla",
"K. Runge",
"A. Soldner-Rembold",
"K. M. Smith",
"W. Snoeys",
"J. Watt"
],
"categories": [
"physics.ins-det",
"physics.med-ph"
],
"doi": "10.1016/S0920-5632(99)00592-7",
"journal_ref": "Nucl.Phys.Proc.Suppl.78:491-496,1999",
"title": "X-ray Imaging Using a Hybrid Photon Counting GaAs Pixel Detector",
"url": "https://arxiv.org/abs/physics/9812039"
},
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