Defective Pixel Map Creation Based on Wavelet Analysis in Digital Radiography Detectors
The application of digital radiography detectors has attracted increasing attention in both medicine and industry. Since the imaging detectors are fabricated by semiconductor manufacturing process over large areas, defective pixels in the detectors are unavoidable. Moreover, the radiation damage due to the routine use of the detectors progressively increases the density of defective pixels. In this study, we present a method of identifying defective pixels in digital radiography detectors based on wavelet analysis. Artifacts generated due to wavelet transformations have been prevented by an additional local threshold method. The proposed method was applied to a sample digital radiography and the result was promising. The proposed method uses a single pair of dark and white images and does not require them to be corrected in gain-and-offset properties. This method will be helpful for the reliable use of digital radiography detectors through the working lifetime.
C. J. Park et al., "Defective Pixel Map Creation Based on Wavelet Analysis in Digital Radiography Detectors," Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, Apr 2011.
The definitive version is available at http://dx.doi.org/10.1016/j.nima.2011.01.037
Mining and Nuclear Engineering
Ministry of Knowledge Economy
Keywords and Phrases
CMOS; Defective Pixel Map; Digital Radiography; Flat-Panel Detector; Wavelet Transformation; X-Ray
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