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Proceedings Paper

Dose-efficient system for digital mammography
Author(s): Mats Danielsson; Hans Bornefalk; Bjoern Cederstroem; Valery Chmill; Bruce H. Hasegawa; Mats Lundqvist; David Robert Nygren; Tamas Tabar
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Paper Abstract

We are developing a dose-efficient system for digital mammography. The system incorporates a refractive x-ray lens combined with a photon counting silicon sensor system. The system matches the digital nature of x-rays and maximum information can be extracted from the transmitted x-ray beam. The photon counting sensor system opens the possibility to weight each photon according to its information content. High- energy photons with little contrast information can be weighted low while low energy photons are weighted high. At the same time, using the refractive x-ray lens, the incident x-ray spectrum can be tuned to the optimum energy for a certain breast thickness. The performance of the system is expected to be close to the theoretical limit in terms of dose efficiency and is entirely limited by quantum noise. Since the standard use of the term DQE does not take into account the incident x-ray energy spectrum, scattered x-rays or the difference in information content from low to high-energy photons an alternative measure of performance is used. We refer to this measure as dose-efficiency and in this case the system is related to an ideal x-ray imaging system.

Paper Details

Date Published: 25 April 2000
PDF: 11 pages
Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384498
Show Author Affiliations
Mats Danielsson, Mamea Imaging AB and Royal Institute of Technology (Sweden)
Hans Bornefalk, Royal Institute of Technology (Sweden)
Bjoern Cederstroem, Mamea Imaging AB and Royal Institute of Technology (Sweden)
Valery Chmill, Royal Institute of Technology (Sweden)
Bruce H. Hasegawa, Univ. of California/San Francisco (United States)
Mats Lundqvist, Mamea Imaging AB and Royal Institute of Technology (Sweden)
David Robert Nygren, Lawrence Berkeley National Lab. (United States)
Tamas Tabar, Tabar Datateknik (Sweden)

Published in SPIE Proceedings Vol. 3977:
Medical Imaging 2000: Physics of Medical Imaging
James T. Dobbins III; John M. Boone, Editor(s)

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