title: [Variation in the quality of CT images of the upper abdomen when CT automatic exposure control is employed].
abstract: The aim of this study was to analyze the reason for variation of image quality in the upper abdomen CT with the use of CT-AEC. The CT investigated was 3D modulation in the 16MDCT and LSCT phantom was used to simulate the patient. When there was a phase difference, an image noise increase of around 15% at the maximum was accepted. It is concluded that the major reason for variation in image quality is respiratory motion and the importance of respiration control must be recognized.
authors.affiliation: Department of Radiology, National Nagano Hospital.
authors.forename: Isao
authors.initials: I
authors.lastname: Aizawa
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Muramatsu
authors.forename: Keiichi
authors.initials: K
authors.lastname: Nomura
authors.forename: Fuminori
authors.initials: F
authors.lastname: Shimizu
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging; D011860:Radiography, Abdominal / Q000379:methods*; D012143:Respiratory Physiological Phenomena; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods