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Image Quality and Radiation Dose on Digital Chest Imaging: Comparison of Amorphous Silicon and Amorphous Selenium Flat-Panel Systems

Klaus Bacher1, Peter Smeets2, Ludo Vereecken3, An De Hauwere1, Philippe Duyck2, Robert De Man3, Koenraad Verstraete2 and Hubert Thierens1

1 Department of Medical Physics and Radiation Protection, Ghent University, Proeftuinstraat 86, Gent B9000, Belgium.
2 Department of Radiology, Ghent University Hospital, Gent, Belgium.
3 Department of Radiology, Heilig Hart Hospital, Roeselare, Belgium.


Figure 1
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  		Fig. 1 —Sample image acquisition of phantom (CDRAD 2.0, Artinis Medical Systems). Phantom contains circular holes logarithmically sized from 0.3 to 8.0 mm in both diameter and depth. For 4 mm or smaller holes, additional hole of matching diameter and depth is located at one of four corners. Presence of these additional holes allows four-alternative forced-choice experiment in which observer must select location of low-contrast objects among four possible corners.

 

Figure 2
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  		Fig. 2A —Average experimental contrast-detail curves. Amorphous silicon ({blacksquare}) and amorphous selenium ({diamond}) images taken with phantom entrance dose of 54 µGy (A), with AEC (B), or with phantom entrance dose of 135 µGy (C). Data points were obtained by averaging responses of five radiologists who reviewed all images independently. Bars indicate SD of 15 image scorings (5 observers x 3 images).

 

Figure 3
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  		Fig. 2B —Average experimental contrast-detail curves. Amorphous silicon ({blacksquare}) and amorphous selenium ({diamond}) images taken with phantom entrance dose of 54 µGy (A), with AEC (B), or with phantom entrance dose of 135 µGy (C). Data points were obtained by averaging responses of five radiologists who reviewed all images independently. Bars indicate SD of 15 image scorings (5 observers x 3 images).

 

Figure 4
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  		Fig. 2C —Average experimental contrast-detail curves. Amorphous silicon ({blacksquare}) and amorphous selenium ({diamond}) images taken with phantom entrance dose of 54 µGy (A), with AEC (B), or with phantom entrance dose of 135 µGy (C). Data points were obtained by averaging responses of five radiologists who reviewed all images independently. Bars indicate SD of 15 image scorings (5 observers x 3 images).

 

Figure 5
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  		Fig. 3 —Inverse image quality figure (IQFinv) of both amorphous silicon ({blacksquare}) and amorphous selenium ({diamond}) derived from phantom images (CDRAD 2.0, Artinis Medical Systems), as function of phantom entrance dose value. Bars indicate SD of 15 image scores (5 observer x 3 images).

 

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