19 March 2008 C-arm based cone-beam CT using a two-concentric-arc source trajectory: system evaluation
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Abstract
The current x-ray source trajectory for C-arm based cone-beam CT is a single arc. Reconstruction from data acquired with this trajectory yields cone-beam artifacts for regions other than the central slice. In this work we present the preliminary evaluation of reconstruction from a source trajectory of two concentric arcs using a flat-panel detector equipped C-arm gantry (GE Healthcare Innova 4100 system, Waukesha, Wisconsin). The reconstruction method employed is a summation of FDK-type reconstructions from the two individual arcs. For the angle between arcs studied here, 30°, this method offers a significant reduction in the visibility of cone-beam artifacts, with the additional advantages of simplicity and ease of implementation due to the fact that it is a direct extension of the reconstruction method currently implemented on commercial systems. Reconstructed images from data acquired from the two arc trajectory are compared to those reconstructed from a single arc trajectory and evaluated in terms of spatial resolution, low contrast resolution, noise, and artifact level.
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Joseph Zambelli, Tingliang Zhuang, Brian E. Nett, Cyril Riddell, Barry Belanger, Guang-Hong Chen, "C-arm based cone-beam CT using a two-concentric-arc source trajectory: system evaluation", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69134U (19 March 2008); doi: 10.1117/12.772781; https://doi.org/10.1117/12.772781
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