Image restoration of cone-beam CT images using wavelet transform

Nobuyuki Nakamori; Kazuya Tsukamoto; Takanori Tsunoo; Yasuo Yoshida; Masahiro Endo; Masahiro Kusakabe

doi:10.1117/12.310856

24 June 1998 Image restoration of cone-beam CT images using wavelet transform

Nobuyuki Nakamori, Kazuya Tsukamoto, Takanori Tsunoo, Yasuo Yoshida, Masahiro Endo, Masahiro Kusakabe

Proceedings Volume 3338, Medical Imaging 1998: Image Processing; (1998) https://doi.org/10.1117/12.310856
Event: Medical Imaging '98, 1998, San Diego, CA, United States

Abstract

We have been developing a computerized scheme to restore cone-beam CT images that are degraded by scatter radiation. In reconstructing 3D image, the cone-beam CT scanner has some advantages over helical CT scanner in shorter reconstruction time and in higher spatial resolution. However, because large amount of scatter radiation is included in 2D projection data, the quality of reconstructed image is worse and cupping artifacts appear in CT images. We have tried to improve the quality of reconstructed images using the multiresolution analysis. To achieve this, the projection data was decomposed into several signals with different spatial resolution and then reconstructed from these decomposed signals by multiplying weighting factors. Moreover, using these weighting factors, we have designed the optimal filter to reconstruct the CT images without any extra computing time. Our results showed that the CT images were enhanced the contrast and improved the quality.

Citation Download Citation

Nobuyuki Nakamori, Kazuya Tsukamoto, Takanori Tsunoo, Yasuo Yoshida, Masahiro Endo, and Masahiro Kusakabe "Image restoration of cone-beam CT images using wavelet transform", Proc. SPIE 3338, Medical Imaging 1998: Image Processing, (24 June 1998); https://doi.org/10.1117/12.310856

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available