Experimental study of beam hardening artifacts in photon counting breast computed tomography
| Autor: | A. Del Guerra, M. Quattrocchi, Paolo Russo, Adele Lauria, Giovanni Mettivier, Daniele Panetta, Maria Giuseppina Bisogni, Valeria Rosso, Roberto Pani, Nico Lanconelli, Paolo Randaccio, Maria Cristina Montesi |
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| Přispěvatelé: | Bisogni, Mg, DEL GUERRA, A, Lanconelli, N, Lauria, Adele, Mettivier, Giovanni, Panetta, D, Pani, R, Quattrocchi, Mg, Randaccio, P, Rosso, V, Russo, Paolo, Montesi, MARIA CRISTINA, M.G. Bisogni, A. Del Guerra, N. Lanconelli, A. Lauria, G. Mettivier, M.C. Montesi, D. Panetta, R. Pani, M.G. Quattrocchi, P. Randaccio, V. Rosso, P. Russo |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Physics
Nuclear and High Energy Physics medicine.medical_specialty Artifact (error) Single photon counting detector Pixel business.industry Detector beam hardening artifact chemistry.chemical_element Tungsten beam hardening artifacts breast ct single photon counting detector Photon counting Anode Charge sharing Optics chemistry medicine BEAM HARDENING ARTIFACTS Breast CT Beam Hardening Artifact Medical physics business Instrumentation |
| Popis: | We are implementing an X-ray breast Computed Tomography (CT) system on the gantry of a dedicated single photon emission tomography system for breast Tc-99 imaging. For the breast CT system we investigated the relevance of the beam hardening artifact. We studied the use of a single photon counting silicon pixel detector (0.3 mm thick, 256 � 256 pixel, 55mm pitch, bump-bonded to the Medipix2 photon counting readout chip) as detector unit in our X-ray CT system. We evaluated the beam hardening ‘‘cupping’’ artifact using homogeneous PMMA slabs and phantoms up to 14 cm in diameter, used as uncompressed breast tissue phantoms, imaged with a tungsten anode tube at 80 kVp with 4.2 mm Al filtration. For beam hardening evaluation we used a bimodal energy model. The CT data show a ‘‘cupping’’ artifact going from 4% (4-cm thick material) to 18% (14-cm thick material). This huge artifacts is influenced by the low detection efficiency and the charge sharing effect of the silicon pixel detector. r 2007 Published by Elsevier B.V. PACS: 85.57.cp; 87.57.Q |
| Databáze: | OpenAIRE |
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