TY - JOUR
AU - Okamura, Masaki
AB - In indirect conversion flat panel detectors (FPDs) for digital X-ray imaging, scintillating materials such as TerbiumdopedGadolinium Oxysulfide (Gadox) convert X-ray into visible light, and an amorphous silicon (a-Si) photodiodearray converts the light into electrons. It is, however, desired that the detector spatial resolution is improved because thelight spreading inside scintillator causes crosstalk to next a-Si photodiode pixels and the resolution is degraded comparedwith direct conversion FPDs which directly convert X-ray into electrons by scintillating material such as amorphousselenium.In this study, the scintillator was pixelated with same pixel pitch as a-Si photodiode array by barrier rib structure to limitthe light spreading, and the detector spatial resolution was improved. The FPD with pixelated scintillator wasmanufactured as follows. The barrier rib structure with 127m pitch was fabricated on a substrate by a photosensitiveorganic-inorganic paste method, and a reflective layer was coated on the surface of the barrier rib, then the structure wasfilled up with Gadox particles. The pixelated scintillator was aligned with 127μm pixel pitch of a-Si photodiode arrayand set as a FPD.The FPD with pixelated scintillator showed high modulation transfer function (MTF) and 0.94 at 1cycle/mm and 0.88 at2cycles/mm were achieved. The MTF values were almost equal to the maximum value that can be theoretically achievedin the FPD with 127m pixel pitch of a-Si photodiode array. Thus the FPD with pixelated scintillators has great potentialto apply for high spatial resolution applications such as mammography and nondestructive testing.
TI - High spatial resolution performance of pixelated scintillators
JF - Proceedings of SPIE
DO - 10.1117/12.2254037
DA - 2017-03-03
UR - https://www.deepdyve.com/lp/spie/high-spatial-resolution-performance-of-pixelated-scintillators-heMURI0HjS
SP - 101323Y
EP - 101323Y-6
VL - 10132
IS - 
DP - DeepDyve
ER -