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Proceedings Paper

Optimization of operating conditions in photon-counting multi-slit mammography based on Si-strip detectors
Author(s): Magnus Åslund; Björn Cederström; Mats Lundqvist; Mats Danielsson
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Paper Abstract

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.

Paper Details

Date Published: 2 March 2006
PDF: 10 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61420A (2 March 2006); doi: 10.1117/12.652728
Show Author Affiliations
Magnus Åslund, Royal Institute of Technology (Sweden)
Sectra Mamea AB (Sweden)
Björn Cederström, Royal Institute of Technology (Sweden)
Mats Lundqvist, Sectra Mamea AB (Sweden)
Mats Danielsson, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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