Pixel Bleeding Correction in Laser Scanning Luminescence Imaging Demonstrated Using Optically Stimulated Luminescence
This paper describes and investigates the performance of an algorithm to correct for “pixel bleeding” caused by slow luminescence centers in laser scanning imaging (e.g., X-ray imaging using photostimulable phosphors and 2nd dosimetry using optically stimulated luminescence). The algorithm is predicated on a deconvolution procedure that takes into account the lifetime of the slow luminescence center and is further constrained by the detection of quick and slow luminescence centers and mixing rows scanned in opposite directions. The algorithm was tested using simulated data and demonstrated experimentally by applying it to image reconstruction of two types of $rm Al_2 rm O _3$ X-ray detector films ($rm Al_2 rm O _3$:C and $rm Al_2 rm O _3$ :C,Mg), whose use in second dosimetry along with laser-scanning readout has thus way been prevented by slow luminescence centers (F-centers, 35 ms lifetime). We show that the algorithm allows the readout of $rm Al_2 rm O _3$ film detectors 300–500 times faster than usually allowed considering the lifetime of the most luminescence centers. By relaxing the stringent needs on the detector's luminescence lifetime, the algorithm opens the chance of using new materials in second dosimetry also different laser scanning applications, like X-ray imaging using storage phosphors and scanning confocal microscopy, though the impact of the noise introduced should be investigated for each specific application.
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