title: Projection domain compensation of missing angles for fan-beam CT reconstruction.
abstract: An improved method is proposed for fan-beam computed tomographic (CT) reconstruction from data with limited views. Compensation for the missing projections for fan-beam CT can be partially accomplished by using the coincident ray or by an interpolation technique using circular sample theory. In this article, the authors propose a more accurate compensation method for the missing projections whether the coincident ray pairs exist or not. The fan-beam reprojection algorithm, which is the inverse operator of the convolution filter, was extended from the projection space iteration reconstruction-reprojection (PSIRR) in parallel beam geometry. In addition, this algorithm was validated by applying the Shepp-Logan phantom for a computer simulation in the equi-angular fan-beam CT geometry.
authors.affiliation: Radiology Department, Georgetown University Medical Center, Washington, DC 20007.
authors.forename: S C
authors.initials: SC
authors.lastname: Lo
authors.forename: S L
authors.initials: SL
authors.lastname: Lou
authors.forename: S K
authors.initials: SK
authors.lastname: Mun
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003198:Computer Simulation; D008961:Models, Structural; D008962:Models, Theoretical; D011856:Radiographic Image Enhancement / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*