Spectral shaping for photon counting digital mammography

被引：4
|
作者：
Aslund, Magnus [1 ]
Fredenberg, Erik [1 ]
Cederstrom, Bjorn [1 ]
Danielsson, Mats [1 ]
机构：
[1] Royal Inst Technol, Dept Phys, Alba Nova, S-10691 Stockholm, Sweden
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2007年 / 580卷 / 02期
关键词：
mammography; photon counting; spectrum; filter; X-ray optics; multi-prism lens;
D O I：
10.1016/j.nima.2007.06.087
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The spectral shaping properties of conventional filters have been evaluated for a photon counting digital mammography system, and the result has been compared with the theoretical spectrum from a multi-prism X-ray lens (MPL). The absorption filters and the MPL were evaluated using a theoretical model of the system which has been verified experimentally. The spectral shaping performance is quantified with the spectral quantum efficiency (SQE), calculated as the polychromatic signal-difference-to-noise ratio (SDNR) squared over the optimal monochromatic SDNR squared at the same average glandular dose. The MPL increases the SQE by 25% compared to the investigated absorption filter when compared with a Tungsten anode. This translates into a potential dose reduction of 20% at maintained SDNR. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1046 / 1049
页数：4
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