title: C-arm based cone-beam CT using a two-concentric-arc source trajectory: system evaluation.
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.
authors.affiliation: Department of Medical Physics, University of Wisconsin-Madison, WI 53704.
authors.forename: Joseph
authors.initials: J
authors.lastname: Zambelli
authors.forename: Tingliang
authors.initials: T
authors.lastname: Zhuang
authors.forename: Brian E
authors.initials: BE
authors.lastname: Nett
authors.forename: Cyril
authors.initials: C
authors.lastname: Riddell
authors.forename: Barry
authors.initials: B
authors.lastname: Belanger
authors.forename: Guang-Hong
authors.initials: GH
authors.lastname: Chen