[Combinations of scan parameters and image quality at C-arm CT for abdominal imaging].
We measured the contrast-to-noise ratio (CNR) and evaluated low-contrast images and streak artifacts to optimize abdominal C-arm CT imaging, and we investigated the view number, acquisition matrix, and pixel depth. To measure CNR, we filled 0.125-1.0-inch cavities in an American Association of Physicists in Medicine (AAPM) CT performance phantom with a sodium chloride solution. Five radiological technologists visually evaluated the noise, signal conspicuity at low-and high-signal density, and the overall image quality using paired comparisons based on Thurstone's law. In a given acquisition matrix, the total view number had the greatest effect on the image noise, artifacts, and signal detectability on C-arm CT images. For a given incident dose per view on the flat-panel detector (FPD), fewer images with noise and streak artifacts resulted when a larger view number was selected.
Nagasue
Nozomu
N
Department of Radiology, Kumamoto University Hospital.
Funama
Yoshinori
Y
Oniki
Rika
R
Segawa
Atsushi
A
Iwatake
Satoshi
S
Kawachino
Tomohiko
T
Uetani
Masataka
M
D054893:Cone-Beam Computed Tomography / Q000295:instrumentation; D021621:Imaging, Three-Dimensional; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011860:Radiography, Abdominal / Q000295:instrumentation