Performance evaluation of CsI screens for X-ray imaging

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ZHAO Bo-Zhen, QIN Xiu-Bo, FENG Zhao-Dong, WEI Cun-Feng, CHEN Yan, WANG Bao-Yi and WEI Long. Performance evaluation of CsI screens for X-ray imaging[J]. Chinese Physics C, 2014, 38(11): 116003. doi: 10.1088/1674-1137/38/11/116003
ZHAO Bo-Zhen, QIN Xiu-Bo, FENG Zhao-Dong, WEI Cun-Feng, CHEN Yan, WANG Bao-Yi and WEI Long. Performance evaluation of CsI screens for X-ray imaging[J]. Chinese Physics C, 2014, 38(11): 116003.  doi: 10.1088/1674-1137/38/11/116003 shu
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Received: 2014-01-10
Revised: 2014-04-29
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Performance evaluation of CsI screens for X-ray imaging

    Corresponding author: QIN Xiu-Bo,

Abstract: CsI 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 μm, 100 μm, 200 μm and 300 μm) 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 μm, 200 μm and 300 μm thick CsI screens, the DQE under RQA7 and RQA9 is lower than that under RQA3 and RQA5 due to low absorption efficiency.

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