Radiological Evaluation Aluminum Step-Wedge and Radiographic Assessment Aluminum step-wedge was used as the reference material in densitometric evaluation of the conventional radiographs. The aluminum wedges were prepared using 99,7% pure aluminum plates, the dimensions of the plates were 1 mm in width and 2, 4, 6, 8, 10, 12 mm in length. Prepared six aluminum plates were sticked in a row and a stair-like aluminum wedge had acquired.