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Optimization of ope...
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Åslund, MagnusKTH,Fysik
(författare)
Optimization of operating conditions in photon counting multi-slit mammography based on Si-strip detectors - art. no. 61420A
- Artikel/kapitelEngelska2006
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SPIE,2006
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LIBRIS-ID:oai:DiVA.org:kth-41967
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41967URI
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https://doi.org/10.1117/12.652728DOI
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Språk:engelska
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Sammanfattning på:engelska
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QC 20111004
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Measurements and simulations of the signal-difference-to-noise ratio (SDNR) and average glandular dose (AGD) have been performed on a photon counting full-field digital mammography system to determine the optimal operating conditions. Several beam qualities were experimentally evaluated by using different combinations of tube voltage, added filters and thickness of BR12 with a tungsten target x-ray tube. The SDNR and AGD were also calculated theoretically for an extended number of operating conditions and a more accurate breast model. As figure of merit for each operating condition, a spectral quantum efficiency (SQE) was calculated as the polychromatic SDNR squared over the optimal monochromatic SDNR squared at the same AGD. The theoretical model agreed within 4% relative the measured SDNR throughout the evaluated breast thickness (30-70 mm) and tube voltage range (26-38 kV). The optimization was performed with a constant SDNR-rate as compared to using a fixed filter thickness. The optimal combinations of tube voltage-filter material were: 32 kV-Ag, 34 kV-Cd, 36 kV-Sn for a breast thickness of 30, 50 and 70 mm respectively. These K-edge filter materials increased the SQE by less than 4% compared to the optimal Al filtration.
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Cederström, BjörnKTH,Fysik(Swepub:kth)u1oerth9
(författare)
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Lundqvist, Mats
(författare)
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Danielsson, MatsKTH,Fysik(Swepub:kth)u1m3qe0f
(författare)
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KTHFysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Medical Imaging 2006: Physics of Medical Imaging, Pts 1-3: SPIE, s. A1420-A14209780819461858
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