The purpose of this work is to investigate the factors determining the magnitude and nature of the lag effect (residual signal) in the Varian PaxScan 4343CB flat-panel detector. Depending on the detector mode, typical value of residual signal is 1-2% after single exposed frame, increasing up to 3% after multiple exposures. The lag effect is the cause of up to 3.6% error of average flat-field signal measurement if used for averaging series of continuously exposed frames, which leads to incorrect assessment of X-ray attenuation coefficients. Spatial dependence of the lag effect is confirmed; the results of correction of projection images using spatially localized impulse response functions are demonstrated.
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Translated from Meditsinskaya Tekhnika, Vol. 54, No. 3, May-Jun., 2020, pp. 17-21.
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Avakyan, A.K., Dergacheva, I.L., Elanchik, A.A. et al. Investigation of the Lag Effect in X-Ray Flat-Panel Detector for Cone-Beam Computed Tomography. Biomed Eng 54, 179–183 (2020). https://doi.org/10.1007/s10527-020-09999-x
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DOI: https://doi.org/10.1007/s10527-020-09999-x