A practical method to reducing metal artifact for dental CT scanners

Author

Kobayashi, Koji ; Katsumata, Atsushi ; Ito, Koichi ; Aoki, Takafumi

Author_Institution

Res. & Dev. Headquarters, Yamatake Corp., Fujisawa

fYear

2008

fDate

8-11 Dec. 2008

Firstpage

1

Lastpage

4

Abstract

An integrated and effective metal artifact reduction method named Metal Erasing (ME) especially suited to dental applications is proposed. Layout of metals is identified as metal-only tomogram, using its characteristics of X-ray opacity and simple image processing technique of binarization together with backward projection. Metal-only sinogram is calculated by forward projection of the metal-only tomogram, and identifies corrupted areas on the original sinogram. The areas are then replaced by interpolation, and filtered back projection (FBP) produces a tomogram without figures of metals. The metals can be reproduced by overlaying already obtained metal-only tomogram utilizing linear characteristics of FBP. It is expected that the ME method can be incorporated into commercial CT scanners easily with reasonable computational overhead.

Keywords

computerised tomography; dentistry; diagnostic radiography; interpolation; medical image processing; X-ray opacity; backward projection; dental CT scanners; dental applications; filtered back projection; forward projection; image processing; interpolation; linear characteristics; metal artifact reduction; metal erasing; metal-only tomogram; original sinogram; Biological materials; Computed tomography; Dentistry; Image processing; Implants; Interpolation; Reconstruction algorithms; Research and development; Teeth; X-ray imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Pattern Recognition, 2008. ICPR 2008. 19th International Conference on

Conference_Location

Tampa, FL

ISSN

1051-4651

Print_ISBN

978-1-4244-2174-9

Electronic_ISBN

1051-4651

Type

conf

DOI

10.1109/ICPR.2008.4761740

Filename

4761740