Detective quantum efficiency of the Medipix pixel detector

Davidson, D.W., Watt, J. , Tlustos, L., Mikulec, B., Campbell, M., Mathieson, K., O'Shea, V. , Smith, K.M. and Rahman, M. (2003) Detective quantum efficiency of the Medipix pixel detector. IEEE Transactions on Nuclear Science, 50(5), 1659 -1663. (doi: 10.1109/TNS.2003.817382)

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We have measured the intrinsic performance of a digital X-ray detector, the Medipix1, by examining the total detective quantum efficiency (DQE). We studied how the DQE depends on both the incident photon energy and spatial frequency. Reported here is the calculation of the detective quantum efficiency for the case of a 300 mum thick silicon diode detector attached to the Medipix1 readout chip. This was done by determining the modulation transfer function and the noise power spectrum; together these allow the frequency component of the DQE to he calculated. X-ray absorption efficiency in the detector gives the dependence on incident energy. This system was found to have a DQE that peaked at 0.118, using a dental X-ray source, and dropped to 0.049 at the Nyquist frequency of 2.94 line pairs per mm.

Item Type:Articles
Glasgow Author(s) Enlighten ID:O'Shea, Professor Val and Mathieson, Dr Keith and Watt, Dr John and Smith, Professor Kenway
Authors: Davidson, D.W., Watt, J., Tlustos, L., Mikulec, B., Campbell, M., Mathieson, K., O'Shea, V., Smith, K.M., and Rahman, M.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
University Services > IT Services > E-Science
Journal Name:IEEE Transactions on Nuclear Science
Publisher:Institute of Electrical and Electronics Engineers
ISSN (Online):1558-1578

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