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 radiogr...

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Bibliographic Details
Published inJournal of computer assisted tomography Vol. 33; no. 6; p. 973
Main Authors Funama, Yoshinori, Taguchi, Katsuyuki, Awai, Kazuo, Sakabe, Daisuke, Shimamura, Masamichi, Yamashita, Yasuyuki
Format Journal Article
LanguageEnglish
Published United States 01.11.2009
Subjects
Adult
Filtration - instrumentation
Humans
Male
Phantoms, Imaging
Posture
Radiation Dosage
Radiation Protection - methods
Tomography, X-Ray Computed - instrumentation
Tomography, X-Ray Computed - methods
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Summary: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.
ISSN:1532-3145
DOI:10.1097/RCT.0b013e31819d6f6f