Image salvage in panoramic radiography using histogram optimization.
Optical density and contrast recovery from poor quality panoramic radiographs was studied using the histogram modification technique. A series of experimental images of varying density and contrast were obtained by exposing a phantom in 4 kV steps between 50 and 94 kV. A standard of good image quality was selected by 10 observers grading the radiographs. Images were processed using the histogram specification technique and re-evaluated. All the processed images were found to be of acceptable quality. This technique was also shown to be applicable for salvaging unacceptable clinical radiographs.
Department of Oral Radiology, Hiroshima University School of Dentistry.
M
M
Ogawa
K
K
Tanimoto
Y
Y
Kodera
Y
Y
Suei
A
A
Taguchi
S
S
Tomita
Y
Y
Furuki
M
M
Fujita
T
T
Wada
D006801:Humans; D007091:Image Processing, Computer-Assisted; D011856:Radiographic Image Enhancement / Q000379:methods*; D011862:Radiography, Panoramic / Q000379:methods*