Defective Pixel Map Creation Based on Wavelet Analysis in Digital Radiography Detectors

Abstract

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.

Department(s)

Nuclear Engineering and Radiation Science

Sponsor(s)

Ministry of Knowledge Economy

Keywords and Phrases

CMOS; Defective Pixel Map; Digital Radiography; Flat-Panel Detector; Wavelet Transformation; X-Ray

International Standard Serial Number (ISSN)

0168-9002

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 Elsevier, All rights reserved.

Publication Date

01 Apr 2011

Link to Full Text

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