Abstract
Purpose
The purpose of this study was to analyze the respiratory motion of each segment of the liver in patients with or without a history of abdominal surgery using four-dimensional computed tomography.
Materials and methods
In total, 57 patients treated for abdominal tumors using proton beam therapy were enrolled. Eighteen patients had a history of abdominal surgery and 39 did not. The positions of clearly demarcated, high-density regions in the liver were measured as evaluation points with which to quantify the motion of each liver segment according to the Couinaud classification.
Results
In total, 218 evaluation points were analyzed. Comparison of differences in the motion of individual liver segments showed that among patients without a history of surgery, the maximum was 29.0 (7.2–42.1) mm in S6 and the minimum was 15.1 (10.6–19.3) mm in S4. Among patients with a history of surgery, the maximum was 28.0 (9.0–37.4) mm in S7 and the minimum was 6.3 (4.1–9.3) mm in S3.
Conclusion
The distances and directions of respiratory motion differed for each liver segment, and a history of abdominal surgery reduced the respiratory motion of the liver. It is necessary to selectively use the internal margin setting.
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Acknowledgements
We gratefully acknowledge the work of the members of the Proton Therapy Center at Fukui Prefectural Hospital as well as the staff of the Radiology Department at Kanazawa University for their understanding and support.
Funding
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Ethical statement
This retrospective study was approved by the research ethics committee of our institution.
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Shimizu, Y., Takamatsu, S., Yamamoto, K. et al. Segmental analysis of respiratory liver motion in patients with and without a history of abdominal surgery. Jpn J Radiol 36, 511–518 (2018). https://doi.org/10.1007/s11604-018-0750-3
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DOI: https://doi.org/10.1007/s11604-018-0750-3