Structured scintillators for X-ray imaging with micrometre resolution

QC 20110309
A 3D X-ray detector for imaging of 30-200keV photons is described. It comprises a stack of semitransparent structured scintillators, where each scintillator is a regular array of waveguides in silicon, and with pores filled with CsI. The performance of the detector is described theoretically and explored in detail through simulations. The resolution of a single screen is shown to be determined only by the pitch, at least up to 100 keV. In comparison to conventional homogenous screens an improvement in efficiency by a factor 5-15 is obtainable. The cross-talk between screens in the 3D detector is shown to be negligible. The concept of such a 3D detector enables ray tracing and super resolution algorithms to be applied. Realized pore geometries have a lower aspect ratio than used in simulations and the roughness of the pore walls gives a 13% decrease in waveguide efficiency. Compared to currently used regular scintillators with similar resolution an efficiency increase by a factor 4 has been found for the structured scintillator.

Schmidt, S. (author)
Poulsen, H. F. (author)
Linnros, JanKTH,Mikroelektronik och tillämpad fysik, MAP(Swepub:kth)u1t79mee (author)
Yun, Sang HoKTH,Mikroelektronik och tillämpad fysik, MAP(Swepub:kth)u18jpr1x (author)
Di Michiel, M. (author)
Martin, T. (author)
KTHMikroelektronik och tillämpad fysik, MAP (creator_code:org_t)

In:Nuclear Instruments and Methods in Physics Research Section A: Elsevier BV607:1, s. 141-1440168-90021872-9576

By the author/editor: Olsen, U. L.; Schmidt, S.; Poulsen, H. F.; Linnros, Jan; Yun, Sang Ho; Di Michiel, M.; show more...; Martin, T.; show less...

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