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Optimization of operating conditions in photon counting multi-slit mammography based on Si-strip detectors - art. no. 61420A
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)In: Medical Imaging 2006: Physics of Medical Imaging, Pts 1-3 / [ed] Flynn, MJ; Hsieh, J, 2006, Vol. 6142, A1420-A1420 p.Conference paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
2006. Vol. 6142, A1420-A1420 p.
Keyword [en]
mammography, photon counting, spectrum, filter, optimization
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-41967DOI: 10.1117/12.652728ISI: 000238049700008ScopusID: 2-s2.0-33745344040ISBN: 978-081946185-8OAI: diva2:445669
Medical Imaging 2006 Conference. San Diego, CA. FEB 12-14, 2006
QC 20111004Available from: 2011-10-04 Created: 2011-10-04 Last updated: 2011-10-04Bibliographically approved

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Åslund, MagnusCederström, BjörnDanielsson, Mats
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