Pixel-Structured Scintillator with Polymeric Microstructures for X-Ray Image Sensors

  • Jung, Im-Deok (Department of Mechanical Engineering, Pusan National University) ;
  • Cho, Min-Kook (Department of Mechanical Engineering, Pusan National University) ;
  • Bae, Kong-Myeong (Department of Mechanical Engineering, Pusan National University) ;
  • Lee, Sang-Min (Department of Mechanical Engineering, Pusan National University) ;
  • Jung, Phill-Gu (Department of Mechanical Engineering, Pusan National University) ;
  • Kim, Ho-Kyung (Department of Mechanical Engineering, Pusan National University) ;
  • Kim, Sung-Sik (Department of Mechanical Engineering, Pusan National University) ;
  • Ko, Jong-Soo (Department of Mechanical Engineering, Pusan National University)
  • Received : 2008.06.04
  • Accepted : 2008.08.20
  • Published : 2008.10.31

Abstract

We introduce a pixel-structured scintillator realized on a flexible polymeric substrate and demonstrate its feasibility as an X-ray converter when it is coupled to photosensitive elements. The sample was prepared by filling $Gd_2O_2S:Tb$ scintillation material into a square-pore-shape cavity array fabricated with polyethylene. For comparison, a sample with the conventional continuous geometry was also prepared. Although the pixelated geometry showed X-ray sensitivity of about 58% compared with the conventional geometry, the resolving power was improved by about 70% above a spatial frequency of 3 $mm^{-1}$. The spatial frequency at 10% of the modulation-transfer function was about 6 $mm^{-1}$.