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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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Abstract

Objective

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.

Methods

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.

Results

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).

Conclusions

Using two orthogonal topograms associated with ATVS could significantly reduce the total radiation dose for lung CT scanning, while subjective IQ was maintained.

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Funding

No funding was received for this work.

Author information

Author notes

  1. Drs. Xiaofei Liu and Mingming Zhang contributed equality to this work. They are joint first author.

Authors and Affiliations

  1. Department of Radiology, The First Hospital of China Medical University, No. 155 Nanjingbei Street, Shenyang, 110001, Liaoning, People’s Republic of China

    Xiaofei Liu, Yu Zhao & Wenge Sun

  2. Department of Clinical Medicine, Jining Medical University, No. 16 Hehua Road, Jining, 272000, Shandong, People’s Republic of China

    Mingming Zhang

  3. Department of Interventional Radiology, Fudan University Shanghai Cancer Center, No. 270 Dongan Street, Shanghai, 200030, People’s Republic of China

    Liang Zhang

Authors
  1. Xiaofei Liu
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  2. Mingming Zhang
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  3. Liang Zhang
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  4. Yu Zhao
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  5. Wenge Sun
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Corresponding author

Correspondence to Wenge Sun.

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All authors report no conflicts of interest.

Ethical standards

This study was approved by the Ethic Committee of the First Hospital of China Medical University, and all patients provided written informed consent.

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Liu, X., Zhang, M., Zhang, L. et al. Radiation dose reduction using two orthogonal topograms associated with automatic tube voltage selection for lung CT scanning as compared with a single anteroposterior topogram. Jpn J Radiol 37, 292–300 (2019). https://doi.org/10.1007/s11604-018-00809-9

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  • DOI: https://doi.org/10.1007/s11604-018-00809-9

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