Comparison of low contrast detectability between a digital amorphous silicon and a screen-film based imaging system for thoracic radiography.
Comparison of low contrast detectability between a digital amorphous silicon and a screen-film based imaging system for thoracic radiography.
复制标题
用于胸部放射线照相的数字非晶硅和基于屏幕胶片的成像系统之间的低对比度可检测性的比较。
DOI:
10.1118/1.598630
复制
发表时间:
1999
期刊:
影响因子:
3.8
通讯作者:
R. Aufrichtig
中科院分区:
文献类型:
--
作者:
R. Aufrichtig
Low contrast threshold detectability is investigated theoretically and experimentally for an amorphous silicon (a-Si) x-ray detector designed for digital radiography and for a standard thoracic screen-film combination. A theoretical signal-to-noise ratio is described with a human observer signal detection model. It is calculated using the detective quantum efficiency (DQE) and the modulation transfer function of the imaging system, as well as a spatial response function for the human visual system. Using a four-alternative forced choice observer perception study, the threshold contrasts of disk shaped objects ranging in size from 0.3 to 4.0 mm are determined. Significantly better contrast detectability is obtained from the digital detector, which is attributed to its higher DQE. On average, the disk shaped objects can be detected at 45% less contrast than required for screen-film. With no free parameters the experimental data agree well with those predicted by the observer model. Based upon the data, the model predicts that x-ray exposure for the a-Si detector only needs to be 30% of the exposure required to perform equally well on the contrast-detail detectability task using screen-film.
登录
查看更多内容
影响因子:
19.7
作者:
Ishida,M;Doi,K;Loo,LN;Metz,CE;Lehr,JL
通讯作者:
Lehr,JL
影响因子:
3.8
作者:
Baydush,AH;Bowsher,JE;Laading,JK;FloydJr,CE
通讯作者:
FloydJr,CE
影响因子:
3.8
作者:
Siewerdsen, JH;Antonuk, LE;Cunningham, IA
通讯作者:
Cunningham, IA
影响因子:
3.8
作者:
Loo,LN;Doi,K;Metz,CE
通讯作者:
Metz,CE
影响因子:
3.8
作者:
Morishita,J;MacMahon,H;Doi,K;Carlin,M;Sukenobu,Y
通讯作者:
Sukenobu,Y