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Evaluation of the Use of Abdominal Compression of the Lung, in Stereotactic Body Radiation Therapy

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S Javadi

S Javadi*, D Pearson , R Palm , K Reddy , University of Toledo, Toledo, OH


SU-I-GPD-T-515 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: The goal of this retrospective study was to determine the benefit in using abdominal compression to reduce tidal volume and diaphragm displacement in 4DCT.

Methods: Thirty patients were assessed by determining the change in tidal volume and diaphragm displacement, with and without abdominal compression. Measurements of lung volume and diaphragm motion were taken at maximum (phase 0) and minimum (phase 50) respiration, with and without abdominal compression, and the difference between these two points was standardized to total lung volume.

Results: The results did not show a significant difference in tidal volume or diaphragm displacement due to wearing a compression belt. The average change in tidal volume was 10.54% ± 0.585% without abdominal compression and was 11.19% ± 0.498% with compression. Diaphragm movement was 1.43cm ± 0.56cm without compression and was found to be 1.31cm ± 0.11cm with compression. Therefore the data shows that use of the compression belt resulted in an decrease in diaphragm movement and an increase in average tidal volume, however these results were not statistically significant.

Conclusion: These findings indicate that abdominal compression may not be a reproducible and effective method in the reduction of respiratory motion. This and other avenues for reduction of respiratory motion should be further evaluated.

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