Image Quality Analysis of an ASi: H/CsI (Tl) Flat-Panel Based Digital Radiography System Using a Chest Phantom


In digital radiography system, the diagnostic utility of image quality mainly depends on processing technique of image data. The aim of this work is to quantitatively evaluate image quality of our aSi:H/CsI(Tl) flat-panel based digital radiography system using a chest phantom. The study on the human visual property and the detector response to four standard radiation qualities (from RQA 3 to RQA 9) was performed. The high and low contrast resolution was assessed with two commercially available digital systems based on the same detector. The resulting signal-to-noise ratios (SNRs) of the nine low contrast objects in the lung, heart and subdia-phragm regionns, and relative spatial resolution in the lung field were comparable with those of other systems. Low contrast objects were automatically detected and SNRs was computed by our image analysis algorithm. The quantitative analysis procedure of image quality designed in this work removes observer's subjectivity. In addition, It can be easily applied for the detectability measurement of low contrast object in other digital modalities. by our Image analysis algorithm

Meeting Name

World Congress on Medical Physics and Biomedical Engineering


Nuclear Engineering and Radiation Science

Keywords and Phrases

ASi:H/Csl(TI) Flat Panel; Digital Radiography System; Signal-To-Noise Ratio; Spatial Resolution; Quantitative Analysis

Document Type

Article - Conference proceedings

Document Version


File Type





© 2007 Springer Verlag, All rights reserved.

Publication Date

01 Jan 2007