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Metal artifact reduction in computed tomography using nonequispaced fourier transform

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2 Author(s)
Kratz, B. ; Inst. of Med. Eng. (IMT), Univ. of Lubeck, Lubeck, Germany ; Buzug, T.M.

Metal objects in the field of view of a computed tomography (CT) scanner cause several artifacts inside the reconstructed image. By reducing the influence of these metallic objects the image quality can be enhanced. We propose a metal artifact reduction (MAR) method based on interpolation using Nonequispaced Fast Fourier Transforms (NFFT). By damping the transformation additional a priori knowledge may be included during the interpolation step. The results are reconstructed with a weighted maximum likelihood expectation maximization algorithm (¿-MLEM) and finally compared to two common one dimensional polynomial interpolation methods.

Published in:

Nuclear Science Symposium Conference Record (NSS/MIC), 2009 IEEE

Date of Conference:

Oct. 24 2009-Nov. 1 2009