| Title |
Correlation-based Lag Correction Factor Measurements for Flat-panel Dynamic Detectors |
| Authors |
이은애(Eunae Lee) ; 김동식(Dong Sik Kim) |
| DOI |
https://doi.org/10.5573/ieie.2022.59.4.71 |
| Keywords |
Correlation; Dynamic detector; Lag correction factor; Fluoroscopic imaging |
| Abstract |
In fluoroscopic imaging, we can acquire x-ray image sequences using a flat-panel dynamic detector. Lag signals are produced from the previously exposed images in the current image frame and cause various lag artifacts. Hence, it is required to reduce the lag signal and develop detectors have low lag signals. In order to conduct an accurate evaluation of the lag signal, the lag correction factor (LCF) is measured and can correct the measured noise power spectrum (NPS) that is lowered due to the lag signal. However, the nonuniform temporal gain (NTG), which is from inconsistent x-ray sources and detector readout circuits, can distort the LCF measurements. In this paper, we observe influences of NTG on correlation-based LCF measurement methods both in theoretical and experimental manners for practically acquired images. Even though the NTG noise is quite small, we can observe measurement errors. Hence, conducting NTG corrections is important for the correlation-based LCF measurements. |