Title :
Spatial resolution of the Medipix2 X-ray imaging detector system
Author :
Davidson, D.W. ; Tlustos, L. ; Mathieson, K. ; O´Shea, V. ; Smith, K.M. ; Rahman, M.
Author_Institution :
Glasgow Univ., Scotland, UK
Abstract :
The charge sharing present in a 55 micrometer square pixel matrix of 300 micrometer thick silicon is examined. This is achieved using a commercial simulation package to investigate the diffusion effects on the charge cloud of created electrons and holes. The total fraction of charge shared is found to be 20.8%, but this can be reduced by the addition of a minimum threshold level of detection. The optimum level giving all of the signal but with the minimum of noise is found to leave 10.4% charge shared on average.
Keywords :
X-ray detection; X-ray imaging; biomedical imaging; diffusion; medical computing; noise; position sensitive particle detectors; silicon radiation detectors; 300 micron; Medipix2 X-ray imaging detector system; charge cloud; charge sharing; commercial simulation package; diffusion effects; electron cloud; holes; minimum threshold level; noise; optimum level; spatial resolution; square pixel matrix; thick silicon; Clouds; Electrodes; Modeling; Packaging; Poisson equations; Silicon; Spatial resolution; X-ray detection; X-ray detectors; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2003 IEEE
Print_ISBN :
0-7803-8257-9
DOI :
10.1109/NSSMIC.2003.1352450
