Truncation Artifacts Caused by the Patient Table in Polyenergetic Statistical Reconstruction on Real C-arm CT Data

Richard N. K. Bismark,Oliver Beuing,Georg Rose

15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine（2019）

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Abstract

In this work, we applied the polyenergetic statistical reconstruction (PSR) technique by A. Elbakri and J. A. Fessler(1) in order to reduce beam hardening artifacts in C-arm CT data. Astonishingly, the corrections were strongly disturbed by truncation artifacts caused by the patient table. Such truncation artifacts are typically invisible with other reconstruction methods. Our findings suggest that this is due to the mathematical structure of the update step in the reconstruction algorithm. We propose two solutions-whithout changing the actual PSR algorithm-that help reduce the table-induced truncation artifacts in PSR and demonstrate their viability on clinical data sets.

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Key words

Beam hardening,C-arm CT,Cone beam,Polychromatic statistical reconstruction,Truncation

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