Radiation dose reduction using two orthogonal topograms associated with automatic tube voltage selection for lung CT scanning as compared with a single anteroposterior topogram
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To evaluate the effectiveness of two orthogonal topograms on radiation dose and image quality (IQ) associated with topogram-based automatic tube voltage selection (ATVS) for lung CT scanning.
Thirty-seven patients were enrolled in this study. At baseline, only an anteroposterior topogram was obtained and at follow-up, both anteroposterior and lateral topograms were performed. ATVS was turned on during all scans. Objective and subjective IQ evaluations were performed and compared; tube voltage and radiation dose of each scan were noted and analyzed.
A significant difference was observed regarding the objective parameters between baseline and follow-up only in image noise and signal–noise ratio (SNR) in the upper one-third of the image (image noise: 7.49 ± 1.08 vs. 9.10 ± 1.13, p < 0.001; SNR: 4.08 ± 0.87 vs. 3.37 ± 0.63, p < 0.001). No differences were found between baseline and follow-up in the subjective assessment of IQ. The radiation dose was significantly lower at follow-up than that at baseline (2.73 ± 0.83 mSv vs. 3.55 ± 1.24 mSv, respectively; p < 0.001).
Using two orthogonal topograms associated with ATVS could significantly reduce the total radiation dose for lung CT scanning, while subjective IQ was maintained.
KeywordsRadiation dose Topogram Automatic tube voltage selection ATVS Lung CT scanning
No funding was received for this work.
Compliance with ethical standards
Conflict of interest
All authors report no conflicts of interest.
This study was approved by the Ethic Committee of the First Hospital of China Medical University, and all patients provided written informed consent.
- 12.Bongartz G, Golding SJ, Jurik AG, et al. European guidelines for multislice computed tomography: appendix c funded by the European Commission. Contract number FIGM-CT2000-20078-CT-TIP. 2013. http://www.msct.eu/CT_Quality_Criteria.htm. Accessed 7 Sept 2016.
- 13.AAPM Task Group 204. Size-specific dose estimates (SSDE) in pediatric and adult body CT examinations, 2011. http://www.aapm.org/pubs/reports/rpt_204.pdf. Accessed 7 Sept 2016.
- 16.Mangold S, De Cecco CN, Wichmann JL, Canstein C, Varga-Szemes A, Caruso D, et al. Effect of automated tube voltage selection, integrated circuit detector and advanced iterative reconstruction on radiation dose and image quality of 3rd generation dual-source aortic CT angiography: an intra-individual comparison. Eur J Radiol. 2016;85(5):972–8.CrossRefGoogle Scholar
- 17.Park C, Gruber-Rouh T, Leithner D, Zierden A, Albrecht MH, Wichmann JL, et al. Single-source chest-abdomen-pelvis cancer staging on a third generation dual-source CT system: comparison of automated tube potential selection to second generation dual-source CT. Cancer Imaging. 2016;16(1):33.CrossRefGoogle Scholar
- 21.Li JL, Huang MP, Liang CH, Zhao ZJ, Liu H, Cui YH, et al. Individualized radiation dose control in 256-slice CT coronary angiography (CTCA) in retrospective ECG-triggered helical scans: using a measure of body size to adjust tube current selection. Eur J Radiol. 2012;81(11):3146–53.CrossRefGoogle Scholar