摘要 :
The iterative reconstruction of a circular cone-beam short-scan (180/spl deg/ plus fan angle) measurement with algebraic reconstruction technique (ART) is investigated. Simulated projections of a transmission tomography scan of th...
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The iterative reconstruction of a circular cone-beam short-scan (180/spl deg/ plus fan angle) measurement with algebraic reconstruction technique (ART) is investigated. Simulated projections of a transmission tomography scan of the Forbild head phantom are reconstructed. The reconstruction of the short-scan sinogram with ART is compared with the reconstruction of a Parker weighted iterative update, which compensates for the redundancy of the measured rays. The results show that a Parker weighting improves the image quality of the reconstruction with ART during the first few iterations compared with the standard ART, but that this difference vanishes with increasing number of iterations.
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摘要 :
The iterative reconstruction of a circular cone-beam short-scan (180/spl deg/ plus fan angle) measurement with algebraic reconstruction technique (ART) is investigated. Simulated projections of a transmission tomography scan of th...
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The iterative reconstruction of a circular cone-beam short-scan (180/spl deg/ plus fan angle) measurement with algebraic reconstruction technique (ART) is investigated. Simulated projections of a transmission tomography scan of the Forbild head phantom are reconstructed. The reconstruction of the short-scan sinogram with ART is compared with the reconstruction of a Parker weighted iterative update, which compensates for the redundancy of the measured rays. The results show that a Parker weighting improves the image quality of the reconstruction with ART during the first few iterations compared with the standard ART, but that this difference vanishes with increasing number of iterations.
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摘要 :
Three dimensional cone-beam reconstruction methods based on the differentiated backprojection accurately reconstruct objects only along measured lines. Thus, the values on a Cartesian grid need to be interpolated from the known da...
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Three dimensional cone-beam reconstruction methods based on the differentiated backprojection accurately reconstruct objects only along measured lines. Thus, the values on a Cartesian grid need to be interpolated from the known data. The quality of the final reconstruction result depends on the chosen interpolation method. In this work, we discuss three solutions to this interpolation problem, compare them, quantify their resolution property and discuss their computational effort. Two of these solutions are original. Methods are tested on simulated data of the ForBild head and thorax phantoms. Three different source trajectories are investigated: helix, saddle and circle-plus-line. Our results suggest that a carefully chosen interpolation method considerably reduces the computational effort in the reconstruction algorithm while maintaining the image quality.
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摘要 :
Three dimensional cone-beam reconstruction methods based on the differentiated backprojection accurately reconstruct objects only along measured lines. Thus, the values on a Cartesian grid need to be interpolated from the known da...
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Three dimensional cone-beam reconstruction methods based on the differentiated backprojection accurately reconstruct objects only along measured lines. Thus, the values on a Cartesian grid need to be interpolated from the known data. The quality of the final reconstruction result depends on the chosen interpolation method. In this work, we discuss three solutions to this interpolation problem, compare them, quantify their resolution property and discuss their computational effort. Two of these solutions are original. Methods are tested on simulated data of the ForBild head and thorax phantoms. Three different source trajectories are investigated: helix, saddle and circle-plus-line. Our results suggest that a carefully chosen interpolation method considerably reduces the computational effort in the reconstruction algorithm while maintaining the image quality.
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摘要 :
This article focuses on the problem of three- dimensional image reconstruction from cone-beam data acquired along a partial circular scan (short-scan): We present a detailed comparative evaluation of three state-of-the-art analyti...
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This article focuses on the problem of three- dimensional image reconstruction from cone-beam data acquired along a partial circular scan (short-scan): We present a detailed comparative evaluation of three state-of-the-art analytical algorithms suggested to achieve image reconstruction in this short-scan geometry. Our evaluation involves quantitative studies, such as the estimation of the contrast-to-noise performance, of the achievable spatial resolution and of the cone-beam artifact behavior of these reconstruction algorithms. In addition to that, we also provide a visual assessment of image quality by evaluating reconstructions of the FORBILD head phantom and a disc phantom. The numerical results presented in this paper were obtained using computer-simulated cone-beam data, while focusing on non-truncated projection data and geometry parameters that are similar to those of real medical C-arm devices.
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摘要 :
Three dimensional cone-beam reconstruction methods based on the differentiated backprojection accurately reconstruct objects only along measured lines. Thus, the values on a Cartesian grid need to be interpolated from the known da...
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Three dimensional cone-beam reconstruction methods based on the differentiated backprojection accurately reconstruct objects only along measured lines. Thus, the values on a Cartesian grid need to be interpolated from the known data. The quality of the final reconstruction result depends on the chosen interpolation method. In this work, we discuss three solutions to this interpolation problem, compare them, quantify their resolution property and discuss their computational effort. Two of these solutions are original. Methods are tested on simulated data of the ForBild head and thorax phantoms. Three different source trajectories are investigated: helix, saddle and circle-plus-line. Our results suggest that a carefully chosen interpolation method considerably reduces the computational effort in the reconstruction algorithm while maintaining the image quality.
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