Limited Angle Tomography
Limited Angle Tomography (LAT) is an X-ray imaging technique for generating a stack of cross-sectional images based on a limited number of two-dimensional projections. A low radiation dose and high in-plane resolution make LAT an attractive alternative to computed tomography. However, the incompleteness of the projection data results in image artifacts that may disable diagnostic interpretation. Our main research focus is the development and improvement of image reconstruction methods to reduce artifacts and increase the diagnostic value of LAT images.
Fields of interest are for example the optimization of the projection access order for the Simultaneous Algebraic Reconstruction Technique (SART) and the development of weighting schemes for iterative reconstruction algorithms. Further investigations focus on the developing of alternative acquisition geometries to improve the LAT image quality without an increase in radiation dose.
Left: An example for 1 of 25 tomosynthesis projections and four slices through the 3D reconstruction with typical artifacts. Right: Caused by handling of the inverse problem during the backprojection the summation of the projections leads to additional values in the reconstruction.
Former Project Members
- Yulia Levakhina
Publications
- [ 2018 ]
- [ 2017 ]
- [ 2016 ]
- [ 2013 ]
- [ 2012 ]
- [ 2011 ]
- [ 2010 ]
- [ 2009 ]
- [ 2008 ]
- [ 2007 ]
- [ 2006 ]
- [ 2005 ]
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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.
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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.
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Augmented Likelihood Image Reconstruction, IEEE Transactions on Medical Imaging, 35(1), 158–173, 2016, DOI: 10.1109/TMI.2015.2459764.
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Augmented likelihood image reconstruction with non-local prior image regularization, 145–8, 2016.
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Influence of metal segmentation on the quality of metal artifact reduction methods, 86683C, 2013, DOI: 10.1117/12.2006810.
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Digitale Tomosynthese - Ein neues Verfahren zur Beurteilung degenerativer Gelenkveränderungen im Vergleich zum konventionellen Röntgen, VO216_4, 2012, DOI: 10.1055/s-0032-1311150.
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Modified Eulers Elastica Inpainting for Metal Artifact Reduction in CT, 310–315, 2012, DOI: 10.1007/978-3-642-28502-8_54.
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Curvelet-based Inpainting for Metal Artifact Reduction in Computed Tomography, 242–245, 2012.
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L1-Regularisierung für die Computertomographie mit begrenztem Aufnahmewinkel, 147–152, 2012, DOI: 10.1007/978-3-642-28502-8_27.
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A fully 3D approach for metal artifact reduction in computed tomography, Medical Physics, 39(11), 7042–7054, 2012, DOI: 10.1118/1.4762289.
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Quality evaluation for metal influenced CT data, 83143Y, 2012, DOI: 10.1117/12.911349.
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Sparse recovery for SPECT imaging of inflammation at implants, 64, 2011.
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Reference-free ground truth metric for metal artifact evaluation in CT images, Medical Physics, 38(7), 4321–4328, 2011, DOI: 10.1118/1.3603198.
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Two-Step Metal Artifact Reduction Using 2D-NFFT and Spherically Symmetric Basis Functions, 3343–3345, 2010, DOI: 10.1109/NSSMIC.2010.5874424.
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Computed Tomography: From Photon Statistics to Modern Cone-Beam CT, Springer, Berlin, 2010, DOI: 10.1007/978-3-540-39408-2.
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Metal artifact reduction in computed tomography using nonequispaced fourier transform, 2720–2723, 2009, DOI: 10.1109/NSSMIC.2009.5401974.
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Metallartefakte in der Computertomographie. Softwarebasierte Ansätze zur Artefaktreduktion, 1213–1222, 2009.
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Spurious Structures Created by Interpolation-Based CT Metal Artifact Reduction, 72581Y, 2009, DOI: 10.1117/12.813515.
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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.
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Intersection Line Length Normalization in CT Projection Data, 77–81, 2008, DOI: 10.1007/978-3-540-78640-5_16.
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Comparison of Nonequispaced Fourier Transform and Polynomial based Metal Artifact Reduction Methods in Computed Tomography, 21–25, 2008, DOI: 10.1007/978-3-540-78640-5_5.
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Sinogram Inpainting for Metal Artifact Reduction in CT Images, 651–654, 2008, DOI: 10.1007/978-3-540-89208-3_155.
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Evaluation of surrogate data quality in sinogram-based CT metal-artifact reduction, 1–10, 2008, DOI: 10.1117/12.793622.
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CT-MAR Reconstruction Using Non-Uniform Fourier Transform, 861–865, 2008, DOI: 10.1007/978-3-540-89208-3_206.
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Statistical Image Reconstruction for Inconsistent CT Projection Data, Methods of Information in Medicine, 46(3), 261–269, 2007, DOI: 10.1160/me9041.
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A Sinogram-Based Metal Artifact Suppression Strategy for Transmission Computed Tomography, 255–262, 2007.
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The λ-MLEM Algorithm: An Iterative Reconstruction Technique for Metal Artifact Reduction in CT Images, 42–47, 2007, DOI: 10.1007/978-3-540-68764-1_6.
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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.
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Modified MLEM Algorithm for Artifact Suppression in CT, 3511–3518, 2006, DOI: 10.1109/NSSMIC.2006.353757.
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Gewichtete MLEM-Rekonstruktion zur Artefaktreduktion in der Transmissions-Computertomographie, 345–346, 2006.
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Statistische Bildrekonstruktion zur Behandlung inkonsistenter Projektionsdaten der Computertomographie, 2006.
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Maximum-Likelihood-Ansatz zur Metallartefaktreduktion bei der Computertomographie, 36–40, 2006, DOI: 10.1007/3-540-32137-3_8.
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Artefact Suppression in Computed Tomography using Iterative Reconstruction Methods, 1130–1131, 2005.
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Reduction of Metal Artifacts in Computed Tomography, Computer Assisted Radiology and Surgery, 1281, 1310, 2005, DOI: 10.1016/j.ics.2005.03.024.
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CT Artifact Reduction with an Iterative Maximum Likelihood Approach, 44, 2005.
- [ BibTeX ]
- Research
- Biochemical Engineering
- Magnetic Particle Imaging
- Magnetic Resonance Imaging
- Nuclear Imaging
- Image Computing
- X-Ray Based Imaging
- Granni
- Completed Projects
- Forensic Workplace for Soft Tissue Reconstruction
- Restoration and Conformal Mapping of Triangulated Surfaces
- Skin-Tumour Classification with Functional Infrared Imaging
- CT Imaging of Neandertaler Fossils
- Micro-CT of a Neandertaler Tooth
- Radiographic Investigations of Micro Ruptures in Technical Diaphragms
- T-Ray Imaging
- In-silico brain tumor growth
- Limited Angle Tomography
- Spectral X-Ray Diffraction