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A protocol-based evaluation of medical image digitizers

E P Efstathopoulos, MSc, L Costaridou, PhD, O Kocsis, MSc and G Panayiotakis, PhD

Department of Medical Physics, School of Medicine, University of Patras, GR 26500 Patras, Greece



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  		Figure 1. Test film used to measure proposed parameters (except uniformity).

 


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  		Figure 2. Line profile used (a) to measure geometric distortion, (b) to derive square wave response and (c) for low contrast discrimination.

 


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  		Figure 3. Input–output response curves for the Lumiscan 20 ({blacktriangleup}) and Lumiscan 75 (•).

 


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  		Figure 4. Noise dependence on optical densities for the Lumiscan 20 ({blacktriangleup}) and Lumiscan 75 (•). s.d., standard deviation.

 


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  		Figure 5. Spatial resolution (expressed as modulation transfer function (MTF)) of the Lumiscan 20 ({blacktriangleup}) and Lumiscan 75(•).

 




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