抄録
The purpose of this research is to evaluate bone changes following implantation of Apatite 2-Piece Implant by radiographs. This paper mainly validates standards for radiographs and digital image processing. Exposure geometry and film processing conditions were standardized. The film holder for each subject was made by modifying a custom-made film holder(Hanshin Indicator). Copper steps(0.1,0.2,0.4,0.8mm)were attached to the X-ray film. A CCD camera was used for data sampling of radiographic images. Their sampling data were digitized and analyzed in digital image processor(Hamamatsu Photonics, DVS-3000)and a computer(HP-9000 series 300).
1. Coefficient of variation which indicates geometric reproducibility of radiograph was within 1%.
2. The linearity of the film density and the brightness was obtained for densities of from 0.2 to 1.5.(coorelation=-0.99)
3. Obvious bone changes were observed following implantation of the apatite implant.
