Comparison between 3-D and z-axis automatic tube current modulation technique in multidetector-row CT

In this study, the 3-D automatic tube current modulation (3-D ATCM) technique was compared with the z-axis ATCM technique on multidetector-row CT. Absorbed dose measurements were performed by inserting an ion chamber into the phantoms, and objective image noise shown as the standard deviation of CT...

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Bibliographic Details
Published in:Radiation protection dosimetry 2008-01, Vol.128 (1), p.106-111
Main Authors: Matsubara, K., Koshida, K., Suzuki, M., Tsujii, H., Yamamoto, T., Matsui, O.
Format: Article
Language:English
Subjects:
Humans
Phantoms, Imaging
Radiation Dosage
Radiographic Image Interpretation, Computer-Assisted
Radiometry
Tomography, X-Ray Computed - instrumentation
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Summary:In this study, the 3-D automatic tube current modulation (3-D ATCM) technique was compared with the z-axis ATCM technique on multidetector-row CT. Absorbed dose measurements were performed by inserting an ion chamber into the phantoms, and objective image noise shown as the standard deviation of CT value in Hounsfield units was measured on the obtained images. The ratio of absorbed doses with 3-D ATCM technique to z-axis ATCM technique was 94.7% using an elliptical cylinder phantom with an inner cylinder phantom and 96.3% using an elliptical cylinder phantom without an inner cylinder phantom. Differences in objective noise between the 3-D ATCM technique and z-axis ATCM technique were within a tolerable range compared with the setting noise index. Therefore, the 3-D ATCM technique effectively optimises the radiation dose, while maintaining an appropriate image quality compared with z-axis ATCM technique.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncm384