Dose-dependent X-ray measurements using a 64x64 hybrid GaAs pixel detector with photon counting

Schwarz, C. et al. (2001) Dose-dependent X-ray measurements using a 64x64 hybrid GaAs pixel detector with photon counting. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 460(1), 91 -96. (doi: 10.1016/S0168-9002(00)01101-3)

Abstract

New developments in medical imaging head towards semiconductor detectors flip-chip bonded to CMOS readout chips. In this work, detectors fabricated on SI-GaAs bulk material were bonded to Photon Counting Chips.(1) This PCC consists of a matrix of 64 x 64 identical square pixels (170 mum x 170 mum) with a 15-bit counter in each cell. We investigated the imaging properties of these detector systems under exposure of a dental X-ray tube. First, a dose calibration of the X-ray tube was performed. Fixed pattern noise in flood exposure images was determined for a fixed dose and an image correction method, which uses a gain map, was applied. For characterising the imaging properties, the signal-to-noise ratio (SNR) was calculated as function of exposure dose. Finally, the dynamic range of the system was estimated.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Watt, Dr John and Smith, Professor Kenway
• Authors: Schwarz, C., Campbell, M., Goeppert, R., Ludwig, J., Mikulec, B., Rogalla, M., Runge, K., Soeldner-Rembold, A., Smith, K.M., Snoeys, W., and Watt, J.
• Subjects: Q Science > QE Geology
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
• Publisher: Elsevier BV
• ISSN: 0168-9002
• ISSN (Online): 1872-9576