Investigating Couch Rotation Angles in Lung Cancer SBRT
Author Information
Author(s): Ye Weiqiang, Wang Housheng, Wei Zhenzhen, Zhang Wei, Yu Chaojun, Zhang Dawei, Su Shida, Qin Wen, Hu Kai, Li Bo
Primary Institution: The First Affiliated Hospital of Guangxi Medical University
Hypothesis
What is the effect of couch rotation angles on non-coplanar VMAT plans for lung cancer SBRT?
Conclusion
Non-coplanar VMAT plans show better dose distribution and lower doses to certain organs at risk compared to coplanar plans, especially with increased couch rotation angles.
Supporting Evidence
- As the couch rotation angle increased, dosimetric parameters such as Dmax and Dmean decreased.
- The CI increased with higher couch rotation angles, indicating better dose conformity.
- Significant reductions in R50% were observed with increasing couch rotation angles.
Takeaway
This study looked at how changing the angle of the treatment couch affects radiation therapy for lung cancer, finding that certain angles can help deliver better treatment.
Methodology
Twenty-four lung cancer patients were treated with seven dual partial-arc VMAT plans at varying couch angles, and dosimetric parameters were evaluated.
Potential Biases
Potential operational inefficiencies and risks of collisions with the treatment machine due to couch rotation.
Limitations
The sample size was small and only included patients with a single tumor.
Participant Demographics
Eighteen men and six women, average age 58.5 years.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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