Image quality and dose in spiral computed tomography.
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.
Verdun
F R
FR
Institut de Radiophysique Appliquée, Centre Universitaire, Lausanne, Switzerland.
Meuli
R A
RA
Bochud
F O
FO
Imsand
C
C
Raimondi
S
S
Schnyder
P
P
Valley
J F
JF
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
D008768:Methylmethacrylates; D011137:Polystyrenes; D014867:Water; D020366:Methylmethacrylate