SYSTEM AND METHOD FOR CORRECTING FOR PHOSPHORESCENCE CONTRIBUTION IN LASER SCANNING IMAGING

摘要

There is provided a method for correcting "pixel bleeding" caused by slow luminescence centers in laser scanning imaging (e.g., X-ray imaging using photostimulable phosphors and 2D dosimetry using optically stimulated luminescence). An embodiment uses a deconvolution procedure that takes into account the lifetime of the slow luminescence center and can be further constrained by the detection of fast and slow luminescence centers and combining line scans in opposite directions. An approach has been tested using simulated data and demonstrated experimentally by applying it to image reconstruction of two types of Al2O3 X-ray detector films (Al2O3:C and Al2O3:C,Mg), whose use in 2D dosimetry in conjunction with laser-scanning readout has so far been prevented by slow luminescence centers (35 ms lifetime from F-centers). We show that the algorithm allows the imaging using Al2O3 detectors 300 times faster than generally allowed considering the lifetime of the main luminescence centers.