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Proceedings Paper

A photon-counting detector for dual-energy breast tomosynthesis
Author(s): Erik Fredenberg; Mats Lundqvist; Magnus Åslund; Magnus Hemmendorff; Björn Cederström; Mats Danielsson
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Paper Abstract

We present the first evaluation of a recently developed silicon-strip detector for photon-counting dual-energy breast tomosynthesis. The detector is well suited for tomosynthesis with high dose efficiency and intrinsic scatter rejection. A method was developed for measuring the spatial resolution of a system based on the detector in terms of the three-dimensional modulation transfer function (MTF). The measurements agreed well with theoretical expectations, and it was seen that depth resolution was won at the cost of a slightly decreased lateral resolution. This may be a justifiable trade-off as clinical images acquired with the system indicate improved conspicuity of breast lesions. The photon-counting detector enables dual-energy subtraction imaging with electronic spectrumsplitting. This improved the detectability of iodine in phantom measurements, and the detector was found to be stable over typical clinical acquisition times. A model of the energy resolution showed that further improvements are within reach by optimization of the detector.

Paper Details

Date Published: 13 March 2009
PDF: 11 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72581J (13 March 2009); doi: 10.1117/12.813037
Show Author Affiliations
Erik Fredenberg, Royal Institute of Technology (Sweden)
Mats Lundqvist, Sectra Mamea AB (Sweden)
Magnus Åslund, Sectra Mamea AB (Sweden)
Magnus Hemmendorff, Sectra Mamea AB (Sweden)
Björn Cederström, Royal Institute of Technology (Sweden)
Mats Danielsson, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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