Title :
Estimation of the gray level variations in soft and hard peri-implant tissue from X-ray images
Author :
Leung, C.C. ; Kwok, P.C.K. ; Zee, K.Y. ; Chan, F.H.Y.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong
fDate :
Oct. 30 1997-Nov. 2 1997
Abstract :
In the treatment and assessment of periodontal disease periapical films are taken at regular intervals. The films are compared around the region of the implant to monitor the changes that have taken place. A computer-assisted method to automate this process is presented here. To compare two images, a pair of X-ray images are superimposed on top of each other. The images are normalized and transformed to obtain the best fit. These images are subtracted and the difference in pixel values are used as a basis for analysis. A method for improving the alignment accuracy and contrast compensation is highlighted.
Keywords :
biological tissues; dentistry; diagnostic radiography; diseases; medical image processing; prosthetics; X-ray images pair; computer-assisted method; gray level variations estimation; hard peri-implant tissue; implant region; medical diagnostic imaging; normalized transformed images; periodontal disease assessment; pixel values differences; soft peri-implant tissue; superimposed images; Brightness; Cameras; Computer errors; Computerized monitoring; Diseases; Image analysis; Image color analysis; Implants; Pixel; X-ray imaging;
Conference_Titel :
Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-4262-3
DOI :
10.1109/IEMBS.1997.757764
