title: Circular CT in combination with a helical segment.
abstract: The combination of circular CT with a helical trajectory segment results in a mathematically complete data set. We present a reconstruction algorithm which is mathematically exact and of the filtered back-projection type. The algorithm ensures that only Radon planes which are not covered along the circle are taken into account, when data from the helical segment are back-projected. Therefore, the helical segment contributes only to low-frequency parts of trans-axial slices. Data along the helix can be obtained with a very low acquisition dose.
authors.affiliation: Philips Research Europe-Hamburg, Sector Medical Imaging Systems, Röntgenstrasse 24-26, D-22 335 Hamburg, Germany. claas.bontus@philips.com
authors.forename: Claas
authors.initials: C
authors.lastname: Bontus
authors.forename: Peter
authors.initials: P
authors.lastname: Koken
authors.forename: Thomas
authors.initials: T
authors.lastname: Köhler
authors.forename: Roland
authors.initials: R
authors.lastname: Proksa
mesh_terms: D000465:Algorithms; D006801:Humans; D015233:Models, Statistical; D008962:Models, Theoretical; D009716:Numerical Analysis, Computer-Assisted; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D036542:Tomography, Spiral Computed / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*