Efficient and Exact C-arm Cone-Beam Imaging for Axially Extended Field-of-View using the Ellipse-Line-Ellipse Trajectory

C-arm computed tomography for axially long fieldof-view is an important extension to the current C-arm 3D imaging capability and can be crucial in some intra-operative cases. Recently, a novel data acquisition geometry, i.e., the EllipseLine-Ellipse trajectory, was proposed for this new technique. It has been shown that this trajectory satisfies mechanical motion constraints of a C-arm system and provides excellent geometrical characteristics for cone-beam image reconstruction. This work makes good use of these characteristics and develops an efficient and exact image reconstruction scheme using the general CB-FBP reconstruction theory. We demonstrate this scheme by computer simulations with a modified FORBILD head phantom.