Redundant shadows in rotational panoramic radiographs. Estimating the imaging positions of objects by mathematical analysis.
The sources of real, ghost, and double images in rotational panoramic radiographs generated by a machine with a continuous movement of the center of rotation are described. No assumptions are made with regard to the trajectory of the center of rotation; rather, an empirical approximation scheme is used to establish a regression from which measured positions of reference objects can be predicted.
Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Chiba, Japan.
M
M
Wakoh
K
K
Kuroyanagi
D016477:Artifacts; D006801:Humans; D016018:Least-Squares Analysis; D008433:Mathematics; D011862:Radiography, Panoramic / Q000379:methods; D012399:Rotation