Shifted detector super short scan reconstruction for the rotate-plus-shift trajectories and its application to C-arm CT systems

Jan Kuntz; Michael Knaup; Christof Fleischmann; Marc Kachelrieß

doi:10.1117/12.2216639

22 March 2016 Shifted detector super short scan reconstruction for the rotate-plus-shift trajectories and its application to C-arm CT systems

Jan Kuntz, Michael Knaup, Christof Fleischmann, Marc Kachelrieß

Author Affiliations +

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 97830I (2016) https://doi.org/10.1117/12.2216639
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

Mobile and compact C-arm systems are routinely used in interventional procedures for fluoroscopic CT imaging. The mechanical requirements guarantee for a maximum of flexibility and mobility but restrict the mechanical rotation range (e.g. 165°) and the lateral size of the field of measurement (FOM), typically about 160 mm. Recently, the rotate-plus-shift trajectory for the acquisition of complete datasets from 180° minus fan-angle has been published.^{1, 2} Here, we combine the rotate-plus-shift trajectory with a shifted detector approach for a fully motorized C-arm system. As the isocenter in non-centric C-arms can be freely chosen, the shifted detector can be equally well absorbed with an offset of the C parallel to the transaxial detector direction. The typical rotation range of 360° used in shifted detector trajectories is replaced by a double rotate-plus-shift scan requiring a rotation range of at least 180° minus fan-angle. The trajectory increasing the diameter of the FOM by up to a factor of two is presented and the practical application of variations with an asymmetric FOM is shown. For image reconstruction we use our modified FDK algorithm that is equipped with a generalized redundancy weight. The presented trajectory can increase the applicability and flexibility of C-arm systems and has the potential to perform intra-operative large volume control or overview scans and thus reduce the patient’s risk.

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Jan Kuntz, Michael Knaup, Christof Fleischmann, and Marc Kachelrieß "Shifted detector super short scan reconstruction for the rotate-plus-shift trajectories and its application to C-arm CT systems", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97830I (22 March 2016); https://doi.org/10.1117/12.2216639

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KEYWORDS

Sensors

Fluctuations and noise

Computed tomography

Reconstruction algorithms

Data acquisition

Imaging systems

X-ray computed tomography

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