title: Image noise and radiation dose using an automatic tube current modulation technique at 64-detector computed tomography: effect of off-center patient position, bowtie filter type, and scan projection radiograph.
abstract: We describe the effect of the off-center position, the bowtie filter type, and the direction of scan projection radiograph on the radiation dose and image noise of 64-detector computed tomographic scans using the automatic tube current modulation technique. On anteroposterior scan projection radiographs, the tube current ratio increased, with an increase in the off-center position of the phantom irrespective of the filter size. On lateral scan projection radiographs, it remained constant with each bowtie filter type regardless of the off-center phantom position.
authors: Department of Radiological Sciences, School of Health Sciences, Kumamoto University, Kumamoto, Japan. funama@kumamoto-u.ac.jp
authors: Yoshinori
authors: Y
authors: Funama
authors: Katsuyuki
authors: K
authors: Taguchi
authors: Kazuo
authors: K
authors: Awai
authors: Daisuke
authors: D
authors: Sakabe
authors: Masamichi
authors: M
authors: Shimamura
authors: Yasuyuki
authors: Y
authors: Yamashita
mesh_terms: D000328:Adult; D016477:Artifacts; D005374:Filtration / Q000295:instrumentation; D006801:Humans; D008297:Male; D019047:Phantoms, Imaging; D011187:Posture; D011829:Radiation Dosage; D011835:Radiation Protection / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*