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.
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.
Funama
Yoshinori
Y
Department of Radiological Sciences, School of Health Sciences, Kumamoto University, Kumamoto, Japan. funama@kumamoto-u.ac.jp
Taguchi
Katsuyuki
K
Awai
Kazuo
K
Sakabe
Daisuke
D
Shimamura
Masamichi
M
Yamashita
Yasuyuki
Y
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*