title: Image quality and dose in spiral computed tomography.
abstract: Image quality and dose produced by a spiral CT with various pitch values were investigated on the basis of test-object images and measurements of CT dose indexes. No major difference in image quality or dose was observed when comparing sequential and spiral mode acquisition with a pitch of one. Increase in pitch value produces a loss of contrast which leads to a loss of detectability. Nevertheless, in realistic protocols the image quality in the transverse plane remains acceptable up to pitch values of 1.3-1.6.
authors.affiliation: Institut de Radiophysique Appliquée, Centre Universitaire, Lausanne, Switzerland.
authors.forename: F R
authors.initials: FR
authors.lastname: Verdun
authors.forename: R A
authors.initials: RA
authors.lastname: Meuli
authors.forename: F O
authors.initials: FO
authors.lastname: Bochud
authors.forename: C
authors.initials: C
authors.lastname: Imsand
authors.forename: S
authors.initials: S
authors.lastname: Raimondi
authors.forename: P
authors.initials: P
authors.lastname: Schnyder
authors.forename: J F
authors.initials: JF
authors.lastname: Valley
mesh_terms: D016477:Artifacts; D002138:Calibration; D007091:Image Processing, Computer-Assisted; D020366:Methylmethacrylate; D008768:Methylmethacrylates; D019047:Phantoms, Imaging; D011137:Polystyrenes; D011785:Quality Assurance, Health Care; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014867:Water
chemical_list: D008768:Methylmethacrylates; D011137:Polystyrenes; D014867:Water; D020366:Methylmethacrylate