Non-circular CT orbit design for elimination of metal artifacts

Grace J. Gang; Jeffrey H. Siewerdsen; J. Webster Stayman

doi:10.1117/12.2550203

16 March 2020 Non-circular CT orbit design for elimination of metal artifacts

Grace J. Gang, Jeffrey H. Siewerdsen, J. Webster Stayman

Author Affiliations +

Proceedings Volume 11312, Medical Imaging 2020: Physics of Medical Imaging; 1131227 (2020) https://doi.org/10.1117/12.2550203
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

Abstract

Metal artifacts are a well-known problem in computed tomography - particularly in interventional imaging where surgical tools and hardware are often found in the field-of-view. An increasing number of interventional imaging systems are capable of non-circular orbits providing one potential avenue to avoid metal artifacts entirely by careful design of the orbital trajectory. In this work, we propose a general design methodology to find complete data solution by applying Tuy’s condition for data completeness. That is, because metal implants effectively cause missing data in projections, we propose to find orbital designs that will not have missing data based on arbitrary placement of metal within the imaging field-of-view. We present the design process for these missing-data-free orbits and evaluate the orbital designs in simulation experiments. The resulting orbits are highly robust to metal objects and show greatly improved visualization of features that are ordinarily obscured.

Conference Presentation

Citation Download Citation

Grace J. Gang, Jeffrey H. Siewerdsen, and J. Webster Stayman "Non-circular CT orbit design for elimination of metal artifacts", Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 1131227 (16 March 2020); https://doi.org/10.1117/12.2550203

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