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KMID : 1149020190210020001
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Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 2 p.1 ~ p.7
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Usefulness of conventional axial scan for decreasing radiation dose in chest CT screening
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Lee Gui-Chul
Nam Tae-Hyun
Dae Chang-Min
Chung Yong-Hwan
Gwon Sun-Ahn
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Abstract
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Purpose: Since the first Computed Tomography commercially available in 1972, dramatic improvements have been made in terms of scan speed, which is very important role in shortening the scanning time by adopting the Multi-detector arrayed CT (MDCT) and spiral (helical) CT techniques. Both MDCT and spiral CT techniques are developing to work interactively. A radiographer can choose the scan mode between conventional axial scan mode and spiral (helical) mode. These days, almost all of CT examinations are performing with the helical scan mode. However, spiral (helical) scan mode is faster than conventional axial scan but it leads to the increase of the radiation dose and reducing image quality cause of geometrical and image reconstruction technique reasons such as interpolation technique.
Methods: As a result of the development of MDCT, it is possible to reconstruct the image without interpolation with less dose compared to the helical scan as the scan range of the z-axis is widened by 1 cycle scan.
Results: The results of this study showed that the conventional axial scan mode reduced the radiation dose about 20% compared to the spiral (helical) mode, and the image quality tests by AAPM phantom and LUNGMAN phantom showed a significant improved (p <0.05), And in the case of LUNGMAN phantom, there was a significant improvement in noise values in nodules measurement. AAPM phantom resolution evaluation measured by plot profile analysis using image J program. As a result, helical scan was able to distinguish 2.8, conventional axial scan 4.7 few holes.
Conclusion: In conclusion, conventional axial scan mode may be able to improve image quality while reducing radiation dose in chest examination of low dose screening chest CT and pediatric patients.
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KEYWORD
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low dose chest CT, Effective dose, AAPM Phantom, LUNGMAN Phant
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