Three-dimensional reconstruction of high contrast objects using C-arm image intensifier projection data

The reconstruction of three-dimensional (3D) objects from D X-ray cone-beam projections using a circular source path is most commonly done with an alg orithm according to Feldkamp et al. [Feldkamp LA, Davis LC, Kress JW. Pract ical cone-beam algorithms. J Opt Soc Am A 1984;6:612-619]. An adaptation of this so-called Feldkamp method to cone-beam projections acquired with a C- arm system is presented here. In a phantom study, reconstruction results ob tained along real source-detector trajectories of a C-arm system are compar ed to reconstruction results obtained from projections acquired from a full -circular trajectory and from one consisting of two full orthogonal circles , which fulfills Tuy's sufficiency condition. The straightforward applicati on of Feldkamp's method adapted to projection data obtained with a C-ann sy stem illustrates the 3D imaging potential of image intensifier based cone-b eam computed tomography. Reconstruction results from projection data of dif ferent patients acquired with a motorized C-arm system such as vessel struc tures filled with contrast agent and bones on presented. (C) 1999 Elsevier Science Ltd. All rights reserved.