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Performance evaluation of CsI screens for X-ray imaging
Zhao BZ(赵博震); Qin XB(秦秀波); Feng ZD(冯召东); Zhao, BZ; Qin, XB; Feng, ZD; Wei, CF; Chen, Y; Wang, BY; Wei, L; Wei CF(魏存峰); Wang BY(王宝义); Wei L(魏龙)
Source PublicationCHINESE PHYSICS C
AbstractCsI film has been one of the most extensively used scintillators for indirect X-ray imaging because of its needle-like micro-structure. The purpose of this paper is to investigate the imaging performance of CsI screen as a function of thickness and radiation quality. Four multilayer scintillation screens with microcolumnar CsI:Tl film (thicknesses of 50 mu m, 100 mu m, 200 mu m and 300 mu m) included were prepared and coupled to an optical imaging sensor. The modulation transfer function (MTF), normalized noise power spectrum (NNPS) and detective quantum efficiency (DQE) of these screens were evaluated based on the standard IEC 62220-1, and the results indicated that, in the medium spatial frequency range (1-6 lp/mm), the MTF of CsI screens with the same thickness was lower when the incident X-ray photon energy was higher, possibly owing to scattering and K-fluorescence re-absorption effects. The NNPS in the higher spatial frequency range (above 8 lp/mm) is dominated by stochastic noise while the entrance surface air Kerma (ESAK) decreases. For 100 mu m, 200 mu m and 300 mu m thick CsI screens, the DQE under RQA7 and RQA9 is lower than that under RQA3 and RQA5 due to low absorption efficiency.
Keywordmicrocolumnar CsI:Tl film scintillation screen DQE
Subject AreaPhysics
Indexed BySCI
WOS IDWOS:000344911400006
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Document Type期刊论文
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GB/T 7714
Zhao BZ,Qin XB,Feng ZD,et al. Performance evaluation of CsI screens for X-ray imaging[J]. CHINESE PHYSICS C,2014,38(11):116003.
APA 赵博震.,秦秀波.,冯召东.,Zhao, BZ.,Qin, XB.,...&魏龙.(2014).Performance evaluation of CsI screens for X-ray imaging.CHINESE PHYSICS C,38(11),116003.
MLA 赵博震,et al."Performance evaluation of CsI screens for X-ray imaging".CHINESE PHYSICS C 38.11(2014):116003.
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