Title :
Analysis of lead oxide (PbO) layers for direct conversion X-ray detection
Author :
Simon, M. ; Ford, R.A. ; Franklin, A.R. ; Grabowski, S.P. ; Menser, B. ; Much, G. ; Nascetti, A. ; Overdick, M. ; Powell, M.J. ; Wiechert, D.U.
Author_Institution :
Philips Res. Lab., Aachen
Abstract :
Lead oxide (PbO) is a candidate direct conversion material for medical X-ray applications. We produced various samples and detectors with thick PbO layers. X-ray performance data such as dark current, charge yield and temporal behaviour were evaluated on small functional samples. The influence of the metal contacts was studied in detail. We also covered large a-Si TFT-plates with PbO. Imaging results from a large detector with an active area of 18times20 cm2 are presented The detector has 960times1080 pixels with a pixel pitch of 184 mum. The MTF at the Nyquist frequency of 2.72 lp/mm is 50 %. Finally, a full size X-ray image is presented
Keywords :
X-ray detection; X-ray imaging; biomedical imaging; position sensitive particle detectors; solid scintillation detectors; Nyquist frequency; X-ray image; a-Si TFT-plates; charge yield; dark current; direct conversion material; lead oxide layers; medical X-ray applications; metal contacts; pixel pitch; temporal behaviour; Biomedical imaging; Dark current; Detectors; Frequency; Lead compounds; Optical imaging; Pixel; X-ray applications; X-ray detection; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Conference_Location :
Rome
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
DOI :
10.1109/NSSMIC.2004.1466833
