Journal
JOURNAL OF INSTRUMENTATION
Volume 15, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1748-0221/15/12/P12008
Keywords
Solid state detectors; X-ray detectors
Categories
Funding
- Khalifa University of Science, technology and research Korea Advanced Institute of Science and Technology (KUSTAR-KAIST)
- Nuclear Research AMP
- Development Program of the Korea Science and Engineering Foundation (KOSEF) - Korean government (MSIP) [2015M2A2A4A03045310]
- BK21 Plus
- National Research Foundation of Korea [2015M2A2A4A03045310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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As the pixel pitch of an X-ray detector decreases, the crosstalk and charge-sharing effects become dominant. The decrease in pixel pitch is also directly related to a reduction in input photons per pixel. Thus, the noise of individual pixel increases in both direct and indirect detectors. In photon counting detector, photon energy shift due to charge sharing and blurring in indirect charge integration detector increases greatly. In this study, we propose the detector shift iteration method (DSIM), which improves both image quality and spatial resolution by solving the abovementioned problems. The Modulation Transfer Function (MTF) and Signal-to-Noise Ratio (SNR) are measured to analyze the image quality and spatial resolution, and the improvement in image contrast is analyzed through various object images. The analysis showed sufficient improvement in both the quality and spatial resolution of the DSIM images. In particular, the DSIM images had better quality than those obtained by sensors with the same pixel pitch as virtual pixel pitch.
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