University of Oulu

M. Kauppinen et al., "Characterization of Seamless CdTe Photon Counting X-Ray Detector," in IEEE Transactions on Instrumentation and Measurement, vol. 70, pp. 1-11, 2021, Art no. 4503811, doi: 10.1109/TIM.2021.307061

Characterization of seamless CdTe photon counting X-ray detector

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Author: Kauppinen, M.1; Winkler, A2; Lämsä, V.3;
Organizations: 1Optoelectronics and Measurement Techniques and with Detection Technology Oyj., Elektroniikkatie 10, 90590 Oulu, Finland
2Detection Technology Oyj., A Grid, Otakaari 5A, 02150 Espoo, Finland
3Detection Technology Oyj., Elektroniikkatie 10, 90590 Oulu, Finland
4AGH University of Science and Technology, Department of Measurement and Electronics, Kraków, Poland
5Research unit of Optoelectronics and Measurement Techniques, Erkki Koiso-Kanttilan katu. 90570 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2022-03-02


Spectrally selective X-ray imaging provides improved material and tissue discrimination in comparison with the state-of-the-art dual energy technologies that are commonly used in medical, industrial, and security applications. Cadmium telluride (CdTe)- and cadmium zinc telluride (CdZnTe)-based line scanners and small size two-dimensional X-ray sensors are emerging to the market, but the need for large-scale panels is axiomatic. In this study, a seamless CdTe tile was developed that enables the implementation of large-sized, energy selective X-ray detector panels. The developed tile consists of a 64 × 64 pixel array (with 150 μm pitch) with a necessary substrate, ASIC, and CdTe crystal. The performance of the constructed seamless tile was characterized by focusing on spectral resolution and stability. In addition, a simple pixel trimming method that automates the equalization of each energy selective pixel was developed and analyzed. The obtained results suggest that the proposed concept of seamless (tileable) detector structures is a feasible approach to scale up panel sizes. The seamless tile shows comparable spectral resolution and stability performance with commercial CdTe sensors. The effect of tile to tile variation, the realization of a large-scale panel, as well as the charge sharing performance were left out of the scope and are to be studied in the next phase.

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Series: IEEE transactions on instrumentation and measurement
ISSN: 0018-9456
ISSN-E: 1557-9662
ISSN-L: 0018-9456
Volume: 10
Article number: 4503811
DOI: 10.1109/TIM.2021.3070615
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
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