2018 [ to top ]

• Ziemann, C., Stille, M., Cremers, F., Buzug, T. M. and Rades, D.: Improvement of dose calculation in radiation therapy due to metal artifact correction using the augmented likelihood image reconstruction, Journal of Applied Clinical Medical Physics, 19(3), 227--233, 2018, DOI: 10.1002/acm2.12325.
  [ BibTeX ] [ URL ]
   
  @article{Ziemann_2018, author = {Ziemann, Christian and Stille, Maik and Cremers, Florian and Buzug, Thorsten M. and Rades, Dirk}, journal = {Journal of Applied Clinical Medical Physics}, keywords = {MetalArtefactReduction buzugthorsten ct imt stillemaik}, month = {apr}, number = 3, pages = {227--233}, publisher = {Wiley}, title = {Improvement of dose calculation in radiation therapy due to metal artifact correction using the augmented likelihood image reconstruction}, volume = 19, year = 2018 }

2017 [ to top ]

• Ziemann, C., Stille, M., Cremers, F., Rades, D. and Buzug, T. M.: The effects of metal artifact reduction on the retrieval of attenuation values, Journal of applied clinical medical physics, 18(1), 243--250, 2017, DOI: 10.1002/acm2.12002.
  [ BibTeX ]
   
  @article{ziemann2017effects, author = {Ziemann, Christian and Stille, Maik and Cremers, Florian and Rades, Dirk and Buzug, Thorsten M}, journal = {Journal of applied clinical medical physics}, keywords = {BuzugThorsten CT IMT MetalArtefactReduction StilleMaik}, number = 1, pages = {243--250}, title = {The effects of metal artifact reduction on the retrieval of attenuation values}, volume = 18, year = 2017 }

2016 [ to top ]

• Stille, M. and Buzug, T. M.: Augmented likelihood image reconstruction with non-local prior image regularization, In: Proc. 4th Intl. Mtg. on image formation in X-ray CT, 145--8, 2016.
  [ BibTeX ]
   
  @conference{stille:16:ali, author = {Stille, M. and Buzug, T. M.}, booktitle = {Proc. 4th Intl. Mtg. on image formation in X-ray CT}, keywords = {BuzugThorsten CT IMT MetalArtefactReduction StilleMaik}, pages = {{145--8}}, title = {Augmented likelihood image reconstruction with non-local prior image regularization}, year = 2016 }
• Stille, M., Kleine, M., Hagele, J., Barkhausen, J. and Buzug, T. M.: Augmented Likelihood Image Reconstruction, IEEE Transactions on Medical Imaging, 35(1), 158-173, 2016, DOI: 10.1109/TMI.2015.2459764.
  [ BibTeX ] [ URL ]
   
  @article{7164320, abstract = {The presence of high-density objects remains an open problem in medical CT imaging. Data of projections passing through objects of high density, such as metal implants, are dominated by noise and are highly affected by beam hardening and scatter. Reconstructed images become less diagnostically conclusive because of pronounced artifacts that manifest as dark and bright streaks. A new reconstruction algorithm is proposed with the aim to reduce these artifacts by incorporating information about shape and known attenuation coefficients of a metal implant. Image reconstruction is considered as a variational optimization problem. The afore-mentioned prior knowledge is introduced in terms of equality constraints. An augmented Lagrangian approach is adapted in order to minimize the associated log-likelihood function for transmission CT. During iterations, temporally appearing artifacts are reduced with a bilateral filter and new projection values are calculated, which are used later on for the reconstruction. A detailed evaluation in cooperation with radiologists is performed on software and hardware phantoms, as well as on clinically relevant patient data of subjects with various metal implants. Results show that the proposed reconstruction algorithm is able to outperform contemporary metal artifact reduction methods such as normalized metal artifact reduction.}, author = {Stille, M. and Kleine, M. and Hagele, J. and Barkhausen, J. and Buzug, T.M.}, journal = {IEEE Transactions on Medical Imaging}, keywords = {BuzugThorsten CT IMT MetalArtefactReduction StilleMaik}, month = {jan}, number = 1, pages = {158-173}, title = {Augmented Likelihood Image Reconstruction}, volume = 35, year = 2016 }

2013 [ to top ]

• Stille, M., Kratz, B., Müller, J., Maaß, N., Schasiepen, I., Elter, M., Weyers, I. and Buzug, T. M.: Influence of metal segmentation on the quality of metal artifact reduction methods, In: SPIE Medical Imaging, 86683C, 2013, DOI: 10.1117/12.2006810.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Stille2013a, author = {Stille, M. and Kratz, B. and Müller, J. and Maaß, N. and Schasiepen, I. and Elter, M. and Weyers, I. and Buzug, T. M.}, booktitle = {SPIE Medical Imaging}, keywords = {BuzugThorsten IMT MetalArtefactReduction StilleMaik}, organization = {International Society for Optics and Photonics}, pages = {86683C}, title = {Influence of metal segmentation on the quality of metal artifact reduction methods}, volume = 8668, year = 2013 }

2012 [ to top ]

• Kratz, B., Ens, S., Kaethner, C., Müller, J. and Buzug, T. M.: Quality evaluation for metal influenced CT data, In: SPIE Medical Imaging, 83143Y, 2012, DOI: 10.1117/12.911349.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Kratz2012a, author = {Kratz, Bärbel and Ens, Svitlana and Kaethner, Christian and Müller, Jan and Buzug, Thorsten M.}, booktitle = {SPIE Medical Imaging}, editor = {Haynor, David R. and Ourselin, Sebastien}, keywords = {BuzugThorsten IMT KaethnerChristian MetalArtefactReduction}, month = {feb}, pages = {83143Y}, publisher = {{SPIE}-Intl Soc Optical Eng}, title = {Quality evaluation for metal influenced {CT} data}, year = 2012 }
• Hamer, J., Kratz, B., Müller, J. and Buzug, T. M.: Modified Eulers Elastica Inpainting for Metal Artifact Reduction in CT, In: Bildverarbeitung für die Medizin, 310-315, 2012, DOI: 10.1007/978-3-642-28502-8_54.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Hamer2012a, author = {Hamer, Julia and Kratz, Bärbel and Müller, Jan and Buzug, Thorsten M.}, booktitle = {Bildverarbeitung für die Medizin}, editor = {Tolxdorff, Thomas and Deserno, Thomas Martin and Handels, Heinz and Meinzer, Hans-Peter}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {310-315}, publisher = {Springer Berlin Heidelberg}, series = {Informatik aktuell}, title = {Modified Eulers Elastica Inpainting for Metal Artifact Reduction in CT}, year = 2012 }
• Kleine, M., Müller, J. and Buzug, T. M.: L1-Regularisierung für die Computertomographie mit begrenztem Aufnahmewinkel, In: Bildverarbeitung für die Medizin, 147-152, 2012, DOI: 10.1007/978-3-642-28502-8_27.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Kleine2012a, author = {Kleine, Matthias and Müller, Jan and Buzug, Thorsten M.}, booktitle = {Bildverarbeitung für die Medizin}, editor = {Tolxdorff, Thomas and Deserno, Thomas Martin and Handels, Heinz and Meinzer, Hans-Peter}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {147-152}, publisher = {Springer Berlin Heidelberg}, series = {Informatik aktuell}, title = {L1-Regularisierung für die Computertomographie mit begrenztem Aufnahmewinkel}, year = 2012 }
• Kleine, M. and Buzug, T. M.: Curvelet-based Inpainting for Metal Artifact Reduction in Computed Tomography, In: Image Formation in X-Ray Computed Tomography, 242-245, 2012.
  [ BibTeX ]
   
  @inproceedings{Kleine2012b, author = {Kleine, M. and Buzug, T. M.}, booktitle = {Image Formation in X-Ray Computed Tomography}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {242-245}, title = {Curvelet-based Inpainting for Metal Artifact Reduction in Computed Tomography}, year = 2012 }
• Duschka, R. L., Bischoff, P., May, K., Levakhina, Y., Buzug, T. M., Kovacs, A., Hunold, P., Barkhausen, J. and Vogt, F. M.: Digitale Tomosynthese - Ein neues Verfahren zur Beurteilung degenerativer Gelenkveränderungen im Vergleich zum konventionellen Röntgen, In: RöFo: Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren, VO216_4, 2012, DOI: 10.1055/s-0032-1311150.
  [ BibTeX ] [ URL ]
   
  @inproceedings{duschka2012digitale, author = {Duschka, RL and Bischoff, P and May, K and Levakhina, Y and Buzug, TM and Kovacs, A and Hunold, P and Barkhausen, J and Vogt, FM}, booktitle = {RöFo: Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {apr}, pages = {VO216_4}, publisher = {Thieme Publishing Group}, title = {Digitale Tomosynthese - Ein neues Verfahren zur Beurteilung degenerativer Gelenkveränderungen im Vergleich zum konventionellen Röntgen}, volume = 184, year = 2012 }
• Kratz, B., Weyers, I. and Buzug, T. M.: A fully 3D approach for metal artifact reduction in computed tomography, Medical Physics, 39(11), 7042-7054, 2012, DOI: 10.1118/1.4762289.
  [ BibTeX ] [ URL ]
   
  @article{Kratz2012b, abstract = {Purpose: In computed tomographyimaging 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.}, author = {Kratz, Bärbel and Weyers, Imke and Buzug, Thorsten M.}, journal = {Medical Physics}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, number = 11, pages = {7042-7054}, title = {A fully 3D approach for metal artifact reduction in computed tomography}, volume = 39, year = 2012 }

2011 [ to top ]

• Kratz, B., Ens, S., Müller, J. and Buzug, T. M.: Reference-free ground truth metric for metal artifact evaluation in CT images, Medical Physics, 38(7), 4321-4328, 2011, DOI: 10.1118/1.3603198.
  [ BibTeX ] [ URL ]
   
  @article{Kratz2011a, abstract = {Purpose: In computed tomography(CT), metal objects in the region of interest introduce data inconsistencies during acquisition. Reconstructing these data results in an image with star shaped artifacts induced by the metal inconsistencies. To enhance image quality, the influence of the metal objects can be reduced by different metal artifact reduction (MAR) strategies. For an adequate evaluation of new MAR approaches a ground truth reference data set is needed. In technical evaluations, where phantoms can be measured with and without metal inserts, ground truth data can easily be obtained by a second reference data acquisition. Obviously, this is not possible for clinical data. Here, an alternative evaluation method is presented without the need of an additionally acquired reference data set. Methods: The proposed metric is based on an inherent ground truth for metal artifacts as well as MAR methods comparison, where no reference information in terms of a second acquisition is needed. The method is based on the forward projection of a reconstructed image, which is compared to the actually measured projection data. Results: The new evaluation technique is performed on phantom and on clinical CT data with and without MAR. The metric results are then compared with methods using a reference data set as well as an expert-based classification. It is shown that the new approach is an adequate quantification technique for artifact strength in reconstructed metal or MAR CTimages. Conclusions: The presented method works solely on the original projection data itself, which yields some advantages compared to distance measures in image domain using two data sets. Beside this, no parameters have to be manually chosen. The new metric is a useful evaluation alternative when no reference data are available.}, author = {Kratz, Bärbel and Ens, Svitlana and Müller, Jan and Buzug, Thorsten M.}, journal = {Medical Physics}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, number = 7, pages = {4321-4328}, title = {Reference-free ground truth metric for metal artifact evaluation in CT images}, volume = 38, year = 2011 }
• Kleine, M., Hamer, J. and Buzug, T. M.: Sparse recovery for SPECT imaging of inflammation at implants, In: Proceedings Medizinische Physik, 64, 2011.
  [ BibTeX ]
   
  @inproceedings{Kleine:2011a, author = {Kleine, M. and Hamer, J. and Buzug, T. M.}, booktitle = {Proceedings Medizinische Physik}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = 64, title = {Sparse recovery for SPECT imaging of inflammation at implants}, year = 2011 }

2010 [ to top ]

• Levakhina, Y., Kratz, B. and Buzug, T. M.: Two-Step Metal Artifact Reduction Using 2D-NFFT and Spherically Symmetric Basis Functions, In: Nuclear Science Symposium and Medical Imaging Conference, 3343-3345, 2010, DOI: 10.1109/NSSMIC.2010.5874424.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Levakhina2010a, abstract = {In computed tomography metal objects lead to inconsistencies in the acquired data which result in image artifacts after reconstruction. To enhance the image quality and allow for a more accurate diagnosis, a metal artifact reduction is required. Approaches may base on a recomputation of metal influenced values or use an alternative image reconstruction technique, which is less sensitive to inconsistent raw data than the standard filtered backprojection. Here, a two-step algorithm for metal artifact reduction is proposed, which combines a 2D NFFT-based interpolation and an MLEM reconstruction with spherically symmetric basis functions (blobs). Reconstructed images have been evaluated visually and quantitatively. Experiments show that combination of a 2D NFFT-based interpolation and blobs offers an effective strategy for enhanced metal artifacts suppression.}, author = {Levakhina, Y. and Kratz, B. and Buzug, T.M.}, booktitle = {Nuclear Science Symposium and Medical Imaging Conference}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {oct}, pages = {3343-3345}, title = {Two-Step Metal Artifact Reduction Using 2D-NFFT and Spherically Symmetric Basis Functions}, year = 2010 }
• Buzug, T. M.: Computed Tomography: From Photon Statistics to Modern Cone-Beam CT, Springer, Berlin, 2010, DOI: 10.1007/978-3-540-39408-2.
  [ BibTeX ] [ URL ]
   
  @book{Buzug2008a, address = {Berlin}, author = {Buzug, Thorsten M.}, keywords = {BuzugThorsten IMT MetalArtefactReduction NDT}, publisher = {Springer}, title = {Computed Tomography: From Photon Statistics to Modern Cone-Beam CT}, year = 2010 }

2009 [ to top ]

• Yu, L., Li, H., Mueller, J., Kofler, J. M., Liu, X., Primak, A. N., Fletcher, J. G., Guimaraes, L. S., Macedo, T. and McCollough, C. H.: Metal Artifact Reduction From Reformatted Projections for Hip Prostheses in Multislice Helical Computed Tomography, Investigative Radiology, 44(11), 691-696, 2009, DOI: 10.1097/rli.0b013e3181b0a2f9.
  [ BibTeX ] [ URL ]
   
  @article{Yu2009a, author = {Yu, Lifeng and Li, Hua and Mueller, Jan and Kofler, James M. and Liu, Xin and Primak, Andrew N. and Fletcher, Joel G. and Guimaraes, Luis S. and Macedo, Thanila and McCollough, Cynthia H.}, journal = {Investigative Radiology}, keywords = {MetalArtefactReduction}, number = 11, pages = {691-696}, publisher = {Ovid Technologies (Wolters Kluwer Health)}, title = {Metal Artifact Reduction From Reformatted Projections for Hip Prostheses in Multislice Helical Computed Tomography}, volume = 44, year = 2009 }
• Kratz, B. and Buzug, T. M.: Metal artifact reduction in computed tomography using nonequispaced fourier transform, In: Nuclear Science Symposium and Medical Imaging Conference, 2720-2723, 2009, DOI: 10.1109/NSSMIC.2009.5401974.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Kratz2008b, abstract = {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.}, author = {Kratz, B. and Buzug, T.M.}, booktitle = {Nuclear Science Symposium and Medical Imaging Conference}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {oct}, pages = {2720-2723}, title = {Metal artifact reduction in computed tomography using nonequispaced fourier transform}, year = 2009 }
• Kratz, B. and Buzug, T. M.: Metallartefakte in der Computertomographie. Softwarebasierte Ansätze zur Artefaktreduktion, In: Jahrestagung der Gesellschaft für Informatik, 1213-1222, 2009.
  [ BibTeX ]
   
  @inproceedings{Kratz2009b, address = {Lübeck}, author = {Kratz, B. and Buzug, T. M.}, booktitle = {Jahrestagung der Gesellschaft für Informatik}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {September}, pages = {1213-1222}, title = {Metallartefakte in der Computertomographie. Softwarebasierte Ansätze zur Artefaktreduktion}, year = 2009 }
• Müller, J. and Buzug, T. M.: Spurious Structures Created by Interpolation-Based CT Metal Artifact Reduction, In: SPIE Medical Imaging, 72581Y, 2009, DOI: 10.1117/12.813515.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Mueller2009a, author = {Müller, J. and Buzug, T. M.}, booktitle = {SPIE Medical Imaging}, editor = {Samei, Ehsan and Hsieh, Jiang}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {feb}, pages = {72581Y}, publisher = {{SPIE}-Intl Soc Optical Eng}, title = {Spurious Structures Created by Interpolation-Based CT Metal Artifact Reduction}, year = 2009 }

2008 [ to top ]

• Kratz, B., Knopp, T., Müller, J., Oehler, M. and Buzug, T. M.: Comparison of Nonequispaced Fourier Transform and Polynomial based Metal Artifact Reduction Methods in Computed Tomography, In: Bildverarbeitung für die Medizin, 21-25, 2008, DOI: 10.1007/978-3-540-78640-5_5.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Kratz2008, author = {Kratz, Bärbel and Knopp, Tobias and Müller, Jan and Oehler, May and Buzug, ThorstenM.}, booktitle = {Bildverarbeitung für die Medizin}, editor = {Tolxdorff, Thomas and Braun, Jürgen and Deserno, ThomasM. and Horsch, Alexander and Handels, Heinz and Meinzer, Hans-Peter}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {21-25}, publisher = {Springer Berlin Heidelberg}, series = {Informatik aktuell}, title = {Comparison of Nonequispaced Fourier Transform and Polynomial based Metal Artifact Reduction Methods in Computed Tomography}, year = 2008 }
• Müller, J. and Buzug, T. M.: Intersection Line Length Normalization in CT Projection Data, In: Bildverarbeitung für die Medizin, 77-81, 2008, DOI: 10.1007/978-3-540-78640-5_16.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Mueller2008, author = {Müller, Jan and Buzug, ThorstenM.}, booktitle = {Bildverarbeitung für die Medizin}, editor = {Tolxdorff, Thomas and Braun, Jürgen and Deserno, ThomasM. and Horsch, Alexander and Handels, Heinz and Meinzer, Hans-Peter}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {77-81}, publisher = {Springer Berlin Heidelberg}, series = {Informatik aktuell}, title = {Intersection Line Length Normalization in CT Projection Data}, year = 2008 }
• Oehler, M., Kratz, B., Knopp, T., Müller, J. and Buzug, T. M.: Evaluation of surrogate data quality in sinogram-based CT metal-artifact reduction, In: Image Reconstruction from Incomplete Data, 1-10, 2008, DOI: 10.1117/12.793622.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Oehler2008, author = {Oehler, May and Kratz, Bärbel and Knopp, Tobias and Müller, Jan and Buzug, Thorsten M.}, booktitle = {Image Reconstruction from Incomplete Data}, editor = {Bones, Philip J. and Fiddy, Michael A. and Millane, Rick P.}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {aug}, pages = {1-10}, publisher = {{SPIE}-Intl Soc Optical Eng}, title = {Evaluation of surrogate data quality in sinogram-based {CT} metal-artifact reduction}, year = 2008 }
• Oehler, M. and Buzug, T. M.: Sinogram Inpainting for Metal Artifact Reduction in CT Images, In: European Conference of the International Federation for Medical and Biological Engineering, 651-654, 2008, DOI: 10.1007/978-3-540-89208-3_155.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Oehler2008a, author = {Oehler, M. and Buzug, T. M.}, booktitle = {European Conference of the International Federation for Medical and Biological Engineering}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {651-654}, title = {Sinogram Inpainting for Metal Artifact Reduction in CT Images}, volume = 22, year = 2008 }
• Kratz, B., Knopp, T., Oehler, M., Ens, S. and Buzug, T. M.: CT-MAR Reconstruction Using Non-Uniform Fourier Transform, In: European Conference of the International Federation for Medical and Biological Engineering, 861-865, 2008, DOI: 10.1007/978-3-540-89208-3_206.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Kratz2008a, author = {Kratz, Bärbel and Knopp, T. and Oehler, M. and Ens, S. and Buzug, T.M.}, booktitle = {European Conference of the International Federation for Medical and Biological Engineering}, editor = {Vander Sloten, Jos and Verdonck, Pascal and Nyssen, Marc and Haueisen, Jens}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {861-865}, publisher = {Springer Berlin Heidelberg}, series = {IFMBE Proceedings}, title = {CT-MAR Reconstruction Using Non-Uniform Fourier Transform}, volume = 22, year = 2008 }

2007 [ to top ]

• Oehler, M. and Buzug, T. M.: A Sinogram-Based Metal Artifact Suppression Strategy for Transmission Computed Tomography, In: Geometriebestimmung mit industrieller Computertomographie, 255-262, 2007.
  [ BibTeX ]
   
  @inproceedings{Oehler2006, address = {Brauschweig}, author = {Oehler, M. and Buzug, T. M.}, booktitle = {Geometriebestimmung mit industrieller Computertomographie}, editor = {Bartscher, M.}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {255-262}, title = {A Sinogram-Based Metal Artifact Suppression Strategy for Transmission Computed Tomography}, year = 2007 }
• Oehler, M. and Buzug, T. M.: The λ-MLEM Algorithm: An Iterative Reconstruction Technique for Metal Artifact Reduction in CT Images, In: Springer Proceedings in Physics, 42-47, 2007, DOI: 10.1007/978-3-540-68764-1_6.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Oehler2007b, author = {Oehler, May and Buzug, ThorstenM.}, booktitle = {Springer Proceedings in Physics}, editor = {Buzug, ThorstenM. and Holz, Dietrich and Bongartz, Jens and Kohl-Bareis, Matthias and Hartmann, Ulrich and Weber, Simone}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {42-47}, publisher = {Springer Berlin Heidelberg}, series = {Springer Proceedings in Physics}, title = {The λ-MLEM Algorithm: An Iterative Reconstruction Technique for Metal Artifact Reduction in CT Images}, volume = 114, year = 2007 }
• Buzug, T. and Oehler, M.: Statistical Image Reconstruction for Inconsistent CT Projection Data, Methods of Information in Medicine, 46(3), 261-269, 2007, DOI: 10.1160/me9041.
  [ BibTeX ] [ URL ]
   
  @article{Oehler2007a, author = {Buzug, Thorsten and Oehler, May}, journal = {Methods of Information in Medicine}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, number = 3, pages = {261-269}, publisher = {Schattauer {GmbH}}, title = {Statistical Image Reconstruction for Inconsistent {CT} Projection Data}, volume = 46, year = 2007 }
• Oehler, M. and Buzug, T. M.: Two Step MLEM Algorithm for Artefact Reduction in CT Images, Computer Assisted Radiology and Surgery, 2(1:1), 38-41, 2007, DOI: 10.1007/s11548-007-0082-8.
  [ BibTeX ] [ URL ]
   
  @article{Oehler2007c, author = {Oehler, M. and Buzug, T. M.}, journal = {Computer Assisted Radiology and Surgery}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, number = {1:1}, pages = {38-41}, title = {Two Step MLEM Algorithm for Artefact Reduction in CT Images}, volume = 2, year = 2007 }

2006 [ to top ]

• Oehler, M. and Buzug, T. M.: Modified MLEM Algorithm for Artifact Suppression in CT, In: Nuclear Science Symposium and Medical Imaging Conference, 3511-3518, 2006, DOI: 10.1109/NSSMIC.2006.353757.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Oehler2006d, abstract = {Iterative methods for CT image reconstruction are widely disregarded in clinical routine due to the inherent massive computational effort. On the other hand, the continuously growing computational power of today's standard computers has led to a rediscovery of these methods. Currently, filtered backprojection (FBP) is the reconstruction method of choice, because it is very fast, especially on dedicated hardware. However, a disadvantage of FBP is that it ignores some of the physical effects like beam hardening, scatter and noise, leading to artifacts in the reconstructed images. Artifacts of this type are particularly dominant if metal objects are inside the patient, because FBP interprets the corresponding projection data as inconsistent. For the method proposed here, the inconsistency of the metal-influenced projection data is reduced with an interpolation scheme working in the Radon-space domain. As the interpolation yields a vague estimate of the real soft-tissue projection values, residual inconsistencies remain. Those residuals can be treated by a modified maximum likelihood expectation maximization (MLEM) method presented in this paper. Within the novel approach, different projection lines through the object can be associated with appropriate weightings that decrease the influence of the residual inconsistencies - resulting in an overall image-quality enhancement. The approach is demonstrated on real CT measurements of a torso phantom equipped with metal markers that allows an evaluation with the corresponding ground truth data.}, author = {Oehler, M. and Buzug, T.M.}, booktitle = {Nuclear Science Symposium and Medical Imaging Conference}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, month = {oct}, pages = {3511-3518}, title = {Modified MLEM Algorithm for Artifact Suppression in CT}, volume = 6, year = 2006 }
• Oehler, M. and Buzug, T. M.: Gewichtete MLEM-Rekonstruktion zur Artefaktreduktion in der Transmissions-Computertomographie, In: Jahrestagung der Deutschen Gesellschaft für Medizinische Physik, 345-346, 2006.
  [ BibTeX ]
   
  @inproceedings{Oehler2006c, address = {Regensburg}, author = {Oehler, M. and Buzug, T. M.}, booktitle = {Jahrestagung der Deutschen Gesellschaft für Medizinische Physik}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {345-346}, title = {Gewichtete MLEM-Rekonstruktion zur Artefaktreduktion in der Transmissions-Computertomographie}, year = 2006 }
• Oehler, M. and Buzug, T. M.: Statistische Bildrekonstruktion zur Behandlung inkonsistenter Projektionsdaten der Computertomographie, In: Deutsche Gesellschaft für Biomedizinische Technik Jahrestagung, 2006.
  [ BibTeX ]
   
  @inproceedings{Oehler2006b, address = {Zürich, Schweiz}, author = {Oehler, M. and Buzug, T. M.}, booktitle = {Deutsche Gesellschaft für Biomedizinische Technik Jahrestagung}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, title = {Statistische Bildrekonstruktion zur Behandlung inkonsistenter Projektionsdaten der Computertomographie}, year = 2006 }
• Oehler, M. and Buzug, T. M.: Maximum-Likelihood-Ansatz zur Metallartefaktreduktion bei der Computertomographie, In: Bildverarbeitung für die Medizin, 36-40, 2006, DOI: 10.1007/3-540-32137-3_8.
  [ BibTeX ] [ URL ]
   
  @inproceedings{Oehler2006a, author = {Oehler, May and Buzug, ThorstenM.}, booktitle = {Bildverarbeitung für die Medizin}, editor = {Handels, Heinz and Ehrhardt, Jan and Horsch, Alexander and Meinzer, Hans-Peter and Tolxdorff, Thomas}, keywords = {BuzugThorsten IMT MetalArtefactReduction}, pages = {36-40}, publisher = {Springer Berlin Heidelberg}, series = {Informatik aktuell}, title = {Maximum-Likelihood-Ansatz zur Metallartefaktreduktion bei der Computertomographie}, year = 2006 }

2005 [ to top ]

• Oehler, M., Pfaffmann, L. and Buzug, T. M.: Artefact Suppression in Computed Tomography using Iterative Reconstruction Methods, In: Deutsche Gesellschaft für Biomedizinische Technik Jahrestagung, 1130-1131, 2005.
  [ BibTeX ]
   
  @inproceedings{Oehler2005d, author = {Oehler, M. and Pfaffmann, L. and Buzug, T. M.}, booktitle = {Deutsche Gesellschaft für Biomedizinische Technik Jahrestagung}, keywords = {BuzugThorsten MetalArtefactReduction}, number = 2, pages = {1130-1131}, title = {Artefact Suppression in Computed Tomography using Iterative Reconstruction Methods}, volume = 50, year = 2005 }
• Oehler, M., Pfaffmann, L. and Buzug, T. M.: Reduction of Metal Artifacts in Computed Tomography, Computer Assisted Radiology and Surgery, 1281, 1310, 2005, DOI: 10.1016/j.ics.2005.03.024.
  [ BibTeX ] [ URL ]
   
  @article{Oehler20051310, author = {Oehler, M. and Pfaffmann, L. and Buzug, T.M.}, booktitle = {Computer Assisted Radiology and Surgery}, journal = {Computer Assisted Radiology and Surgery}, keywords = {BuzugThorsten MetalArtefactReduction}, note = {\{CARS\} 2005: Computer Assisted Radiology and SurgeryProceedings of the 19th International Congress and Exhibition}, pages = 1310, title = {Reduction of Metal Artifacts in Computed Tomography}, volume = 1281, year = 2005 }
• Oehler, M. and Buzug, T. M.: CT Artifact Reduction with an Iterative Maximum Likelihood Approach, In: Computer Aided Surgery around the Head, 44, 2005.
  [ BibTeX ]
   
  @inproceedings{Oehler2005f, address = {D{\"u}sseldorf}, author = {Oehler, M. and Buzug, T. M.}, booktitle = {Computer Aided Surgery around the Head}, keywords = {BuzugThorsten MetalArtefactReduction}, number = 258, pages = 44, publisher = {VDI-Verlag}, title = {CT Artifact Reduction with an Iterative Maximum Likelihood Approach}, year = 2005 }