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An X-ray imaging pixel detector based on a scintillating guides screen

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4 Author(s)
Kleimann, P. ; Dept. of Electron., Kungl. Tekniska Hogskolan, Kista, Sweden ; Linnros, J. ; Frojdh, C. ; Petersson, C.S.

We have developed and preliminary tested a new digital X-ray imaging sensor based on a scintillating guide screen. The scintillating guides are used to channel the emitted visible light to the pixel detector. This enables us to avoid the well-known tradeoff between detection efficiency and spatial resolution which is encountered when a non-patterned scintillating layer is used on top of a CCD. A prototype has been fabricated using microtechnologies. The scintillator is CsI:Tl and the low-index cladding material used to channel the light is silicon dioxide. The performance of this prototype has been compared to that of a thick CsI single crystal. The results concerning the spatial resolution are quite promising and demonstrate a proof-of-principle. However, the performance in terms of signal to noise ratio and sensitivity have to be improved. These problems are currently addressed

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Nuclear Science, IEEE Transactions on  (Volume:47 ,  Issue: 4 )