A mathematical model relating changes of grey values to changes of thicknesses of a stepwedge

The purpose of this report is to present a mathematical model relating changes in grey values to changes of thicknesses of a stepwedge. Radiographs of a stepwedge were obtained through a limited exposure range on a single Kodak 6100 charge-coupled device detector at 63 kVp and 70 kVp. Grey values fr...

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Bibliographic Details
Published in:Dento-maxillo-facial radiology 2013, Vol.42 (1), p.50719185-50719185
Main Authors: Geha, H, Bechara, B, Faddoul, T, Noujeim, M
Format: Article
Language:English
Subjects:
Algorithms
Dentistry
Models, Theoretical
Phantoms, Imaging
Radiation Dosage
Radiographic Image Enhancement
Radiography, Dental, Digital
Regression Analysis
Semiconductors
Software
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Summary:The purpose of this report is to present a mathematical model relating changes in grey values to changes of thicknesses of a stepwedge. Radiographs of a stepwedge were obtained through a limited exposure range on a single Kodak 6100 charge-coupled device detector at 63 kVp and 70 kVp. Grey values from each step were evaluated relative to the corresponding step thickness. All possible regression fits were evaluated based on their coefficient of determination (R(2)) value and their mean squared errors (MSEs) relative to the original thickness. For all exposure settings, the fifth-degree polynomial was the best possible fit, with the highest R(2) value and the lowest MSE.
ISSN:0250-832X
1476-542X
DOI:10.1259/dmfr/50719185