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 (lambda-MLEM) and finally compared to two common one dimensional polynomial interpolation methods.
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Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USAStanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
Wu, Meng
Keil, Andreas
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microDimens GmbH, D-81379 Munich, GermanyStanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
Keil, Andreas
Constantin, Dragos
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Varian Med Syst Inc, Palo Alto, CA 94304 USAStanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
Constantin, Dragos
Star-Lack, Josh
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Varian Med Syst Inc, Palo Alto, CA 94304 USAStanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
Star-Lack, Josh
Zhu, Lei
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Georgia Inst Technol, George W Woodruff Sch Mech Engn, Nucl & Radiol Engn Program, Atlanta, GA 30332 USA
Georgia Inst Technol, George W Woodruff Sch Mech Engn, Med Phys Program, Atlanta, GA 30332 USAStanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
Zhu, Lei
Fahrig, Rebecca
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Stanford Univ, Dept Radiol, Stanford, CA 94305 USAStanford Univ, Dept Elect Engn, Stanford, CA 94305 USA