Theoretically-exact filtered-backprojection reconstruction from real data on the line-ellipse-line trajectory

摘要

C-arm CT imaging can be improved in terms of axial coverage and cone-beam artifacts using advanced dataacquisition geometries such as the extend line-ellipse-line trajectory. Previously, we showed that such a geometrycan be robustly implemented on a clinical system. Here, we demonstrate that imperfections in the trajectoryrealization can be addressed so as to achieve accurate high contrast imaging with a theoretical-exact filtered-backprojection algorithm. The performance of the proposed algorithm is evaluated using the FORBILD headphantom as well as real data of an anthropomorphic head phantom.