DQE evaluation of a full-field digital mammography system

被引：3
|
作者：
Roehrig, H [1 ]
Gandhi, K [1 ]
Fan, JH [1 ]
Poolla, A [1 ]
Mimura, S [1 ]
机构：
[1] Univ Arizona, Dept Radiol, Tucson, AZ 85724 USA
来源：
PENETRATING RADIATION SYSTEMS AND APPLICATIONS VI | 2004年 / 5541卷
关键词：
digital mammography; amorphous silicon based flat panel detector; Detective Quantum Efficiency (DQE); 2-D noise power spectrum (2-D NPS); modulation transfer function (MTF);
D O I：
10.1117/12.565872
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Physical characteristics necessary to calculate the Detective Quantum Efficiency of a clinically used flat panel imager for full-breast digital mammography are presented. Objective quantities such as modulation transfer function (MTF), noise power spectrum (NPS) and detective quantum efficiency (DQE) have been evaluated. The X-ray photon fluence was determined using Half-Value-Layer (HVL) techniques. At an X-ray beam characterized by 28 kVp, Mo-anode and Mo filter as well as beam hardening by 5 cm Lucite, the detector is practically linear with x-ray exposure at least up to 33 mR. At an exposure of 33 mR and close to zero spatial frequency the DQE is in the vicinity of 60%.
引用
收藏
页码：141 / 152
页数：12
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