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Sensors 2016, 16(6), 772;

Evaluation of a Wobbling Method Applied to Correcting Defective Pixels of CZT Detectors in SPECT Imaging

Department of Biomedical Engineering, Peking University, No. 5, Yiheyuan Road, Beijing 100871, China
Department of Control Technology and Instrument, Hebei University, No. 180, Wusi East Road, Baoding 071000, China
General Hospital of Chinese People’s Liberation Army, No. 28 Fuxing Road, Beijing 100039, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Gonzalo Pajares Martinsanz
Received: 17 February 2016 / Revised: 20 April 2016 / Accepted: 16 May 2016 / Published: 27 May 2016
(This article belongs to the Special Issue Imaging: Sensors and Technologies)
Full-Text   |   PDF [5967 KB, uploaded 27 May 2016]   |  


In this paper, we propose a wobbling method to correct bad pixels in cadmium zinc telluride (CZT) detectors, using information of related images. We build up an automated device that realizes the wobbling correction for small animal Single Photon Emission Computed Tomography (SPECT) imaging. The wobbling correction method is applied to various constellations of defective pixels. The corrected images are compared with the results of conventional interpolation method, and the correction effectiveness is evaluated quantitatively using the factor of peak signal-to-noise ratio (PSNR) and structural similarity (SSIM). In summary, the proposed wobbling method, equipped with the automatic mechanical system, provides a better image quality for correcting defective pixels, which could be used for all pixelated detectors for molecular imaging. View Full-Text
Keywords: semiconductor detector; CZT; defective points; calibration; wobbling method semiconductor detector; CZT; defective points; calibration; wobbling method

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Xie, Z.; Li, S.; Yang, K.; Xu, B.; Ren, Q. Evaluation of a Wobbling Method Applied to Correcting Defective Pixels of CZT Detectors in SPECT Imaging. Sensors 2016, 16, 772.

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