Preliminary results with a three-layer linear array silicon pixel detector
| Autor: | Arfelli, F., Bonvicini, V., Bravin, A., Cantatore, G., Castelli, E., Palma, L. D., Longo, R., Olivo, A., Pani, S., Poropat, P., Prest, Michela, Rashevsky, A., Rigon, L., Tromba, G., Vacchi, A., Vallazza, E. |
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| Přispěvatelé: | Arfelli, F, Bonvicini, V, Bravin, A, Cantatore, G, Castelli, E, Palma, L, Longo, R, Olivo, A, Pani, S, Poropat, P, Prest, M, Rashevsky, A, Rigon, L, Tromba, G, Vacchi, A, Vallazza, E |
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: | |
| Popis: | A linear array silicon pixel detector has been developed to perform digital radiology with synchrotron radiation: in this communication we present the first results obtained using a three layer prototype at the Elettra Synchrotron Radiation Facility (Trieste, Italy). High efficiency (about 85% at 20 keV) is achieved by means of a Si strip detector irradiated in an `edge-on' geometry: the pixel dimensions are 200×300 μm2. To obtain a sensitive area of about 50xl mm2 a stack of three layers has been assembled. Images are obtained by means of scanning techniques and their spatial resolution is determined by the scanning step. Detectors are read-out by dedicated, low noise VLSI CMOS chips in single photon counting mode. The distance between each detector layer has been measured to be 115±10 μm and the layers are parallel within a maximum tilt angle of 0.08°. Cross-talk effects were found to be always smaller than 2% of the counts of the neighboring layers. The MTF in the scan direction has been evaluated. The acquisition time needed to acquire an image of a mammographic test object is about 6 minutes. The mean glandular dose is about 30% of the dose delivered at the conventional mammographic unit for the same test object while the detail visibility is comparable. These preliminary results indicate that a large area linear array silicon pixel detector can be developed: using this detector and a monochromatic synchrotron radiation beam the delivered mean glandular dose is significantly reduced when compared to conventional mammographic examinations. |
| Databáze: | OpenAIRE |
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