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How many times can we use a phosphor plate? A preliminary study

S Ergün*,1, P Güneri1, D Ilgüy2, M Ilgüy2 and H Boyacioglu3

1Faculty of Dentistry, Department of Oral Diagnosis and Radiology, Ege University, Bornova 35100, Izmir, Turkey; 2Faculty of Dentistry, Department of Oral Diagnosis and Radiology, Yeditepe University, Göztepe, Ìstanbul, Turkey; 3Department of Statistics, Faculty of Science, Ege University, Bornova 35100, Izmir, Turkey


Figure 1
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  		Figure 1 Baseline image obtained from the first exposure with an aluminium stepwedge

 

Figure 2
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  		Figure 2 (a) Subsequent digital image of the plate obtained after the 20th exposure. (b) Subsequent digital image of the plate obtained after the 200th exposure

 

Figure 3
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  		Figure 3 All radiographic images were subtracted from the first digital image (baseline) using newly developed software for digital subtraction radiography

 

Figure 4
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  		Figure 4 The mean grey values, standard deviations and median values of the subtracted images were established with the Photoshop v8.0 histogram tool, and these values were recorded. 50x50 pixel areas were selected and set as the "area of interest". Three measurements were performed on each image

 

Figure 5
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  		Figure 5 The resultant image of the subtraction of the 1st and 200th exposures

 

Figure 6
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  		Figure 6 Black and white areas and artefacts

 




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