Structured scintillators for X-ray imaging with micrometre resolution
2009 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 607, no 1, 141-144 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2009. Vol. 607, no 1, 141-144 p.
Scintillator, Detector, Imaging, Hard X-ray, Simulation
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-30716DOI: 10.1016/j.nima.2009.03.139ISI: 000268987900042ScopusID: 2-s2.0-67650494359OAI: oai:DiVA.org:kth-30716DiVA: diva2:402710
QC 201103092011-03-092011-03-042011-03-09Bibliographically approved