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The samples were radiographed beside the aluminum step wedge using a complementary metal-oxide semiconductor (CMOS) sensor of the Kodak[R] RVG 6100 Digital Radiography System (Carestream Health, New York, USA) and a dental X-ray machine (Dabi Atlante[R] Spectro 70X Eletronic, Ribeirao Preto, Sao Paulo State, Brazil).
Normalization was performed on the 6 separate radiographs containing each of the 6 unique step wedges, and the repeat measurements of each individual step wedge was averaged.
The effect of storage conditions on photothermographically processed films was investigated using quality-control films that were exposed automatically to an optical step wedge by built-in software in dry laser printers.