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Title: A fully 3D approach for metal artifact reduction in computed tomography

Abstract

Purpose: In computed tomography imaging metal objects in the region of interest introduce inconsistencies during data acquisition. Reconstructing these data leads to an image in spatial domain including star-shaped or stripe-like artifacts. In order to enhance the quality of the resulting image the influence of the metal objects can be reduced. Here, a metal artifact reduction (MAR) approach is proposed that is based on a recomputation of the inconsistent projection data using a fully three-dimensional Fourier-based interpolation. The success of the projection space restoration depends sensitively on a sensible continuation of neighboring structures into the recomputed area. Fortunately, structural information of the entire data is inherently included in the Fourier space of the data. This can be used for a reasonable recomputation of the inconsistent projection data. Methods: The key step of the proposed MAR strategy is the recomputation of the inconsistent projection data based on an interpolation using nonequispaced fast Fourier transforms (NFFT). The NFFT interpolation can be applied in arbitrary dimension. The approach overcomes the problem of adequate neighborhood definitions on irregular grids, since this is inherently given through the usage of higher dimensional Fourier transforms. Here, applications up to the third interpolation dimension are presented and validated.more » Furthermore, prior knowledge may be included by an appropriate damping of the transform during the interpolation step. This MAR method is applicable on each angular view of a detector row, on two-dimensional projection data as well as on three-dimensional projection data, e.g., a set of sequential acquisitions at different spatial positions, projection data of a spiral acquisition, or cone-beam projection data. Results: Results of the novel MAR scheme based on one-, two-, and three-dimensional NFFT interpolations are presented. All results are compared in projection data space and spatial domain with the well-known one-dimensional linear interpolation strategy. Conclusions: In conclusion, it is recommended to include as much spatial information into the recomputation step as possible. This is realized by increasing the dimension of the NFFT. The resulting image quality can be enhanced considerably.« less

Authors:
; ;  [1];  [2];  [2]
  1. Institute of Medical Engineering, University of Luebeck, Luebeck 23562 (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
22099091
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 39; Journal Issue: 11; Other Information: (c) 2012 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 60 APPLIED LIFE SCIENCES; COMPUTERIZED TOMOGRAPHY; DAMPING; DATA ACQUISITION; EVALUATION; FOURIER TRANSFORMATION; IMAGE PROCESSING; IMAGES; INTERPOLATION

Citation Formats

Kratz, Baerbel, Weyers, Imke, Buzug, Thorsten M., Institute of Anatomy, University of Luebeck, Luebeck 23562, and Institute of Medical Engineering, University of Luebeck, Luebeck 23562. A fully 3D approach for metal artifact reduction in computed tomography. United States: N. p., 2012. Web. doi:10.1118/1.4762289.
Kratz, Baerbel, Weyers, Imke, Buzug, Thorsten M., Institute of Anatomy, University of Luebeck, Luebeck 23562, & Institute of Medical Engineering, University of Luebeck, Luebeck 23562. A fully 3D approach for metal artifact reduction in computed tomography. United States. doi:10.1118/1.4762289.
Kratz, Baerbel, Weyers, Imke, Buzug, Thorsten M., Institute of Anatomy, University of Luebeck, Luebeck 23562, and Institute of Medical Engineering, University of Luebeck, Luebeck 23562. Thu . "A fully 3D approach for metal artifact reduction in computed tomography". United States. doi:10.1118/1.4762289.
@article{osti_22099091,
title = {A fully 3D approach for metal artifact reduction in computed tomography},
author = {Kratz, Baerbel and Weyers, Imke and Buzug, Thorsten M. and Institute of Anatomy, University of Luebeck, Luebeck 23562 and Institute of Medical Engineering, University of Luebeck, Luebeck 23562},
abstractNote = {Purpose: In computed tomography imaging metal objects in the region of interest introduce inconsistencies during data acquisition. Reconstructing these data leads to an image in spatial domain including star-shaped or stripe-like artifacts. In order to enhance the quality of the resulting image the influence of the metal objects can be reduced. Here, a metal artifact reduction (MAR) approach is proposed that is based on a recomputation of the inconsistent projection data using a fully three-dimensional Fourier-based interpolation. The success of the projection space restoration depends sensitively on a sensible continuation of neighboring structures into the recomputed area. Fortunately, structural information of the entire data is inherently included in the Fourier space of the data. This can be used for a reasonable recomputation of the inconsistent projection data. Methods: The key step of the proposed MAR strategy is the recomputation of the inconsistent projection data based on an interpolation using nonequispaced fast Fourier transforms (NFFT). The NFFT interpolation can be applied in arbitrary dimension. The approach overcomes the problem of adequate neighborhood definitions on irregular grids, since this is inherently given through the usage of higher dimensional Fourier transforms. Here, applications up to the third interpolation dimension are presented and validated. Furthermore, prior knowledge may be included by an appropriate damping of the transform during the interpolation step. This MAR method is applicable on each angular view of a detector row, on two-dimensional projection data as well as on three-dimensional projection data, e.g., a set of sequential acquisitions at different spatial positions, projection data of a spiral acquisition, or cone-beam projection data. Results: Results of the novel MAR scheme based on one-, two-, and three-dimensional NFFT interpolations are presented. All results are compared in projection data space and spatial domain with the well-known one-dimensional linear interpolation strategy. Conclusions: In conclusion, it is recommended to include as much spatial information into the recomputation step as possible. This is realized by increasing the dimension of the NFFT. The resulting image quality can be enhanced considerably.},
doi = {10.1118/1.4762289},
journal = {Medical Physics},
issn = {0094-2405},
number = 11,
volume = 39,
place = {United States},
year = {2012},
month = {11}
}