Comparison on plan quality and dose verification of volumetric modulated arc therapy plans designed by two commercial planning systems(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第11期
- Page:
- 1241-1245
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Comparison on plan quality and dose verification of volumetric modulated arc therapy plans designed by two commercial planning systems
- Author(s):
- LIU Liangyou; YANG Tao; CONG Xiaohu; WANG Xiaoshen; WANG Jinyuan; LIU Mengwen; XU Shouping
- Department of Radiation Oncology, Chinese PLA General Hospital, Beijing 100853, China
- Keywords:
- ; Keywords: volumetric intensity modulated arc therapy; laryngeal cancer; rectal cancer; plan quality; dose verification; treatment planning system
- PACS:
- R312；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.11.001
- Abstract:
- Abstract: Objective To investigate the differences in dosimetric characteristics and dose verification of volumetric modulated arc therapy (VMAT) plans designed by two commercial planning systems for patients with laryngeal and rectal cancers for providing some guidance for the clinical application of treatment planning system. Methods VMAT plans and verification plans based on Eclipse and Pinnacle were designed for 10 patients with laryngeal cancer and 12 patients with rectal cancer. ArcCheck system was used for data collection and Gamma passing rates were analyzed with the criteria of 3%/3 mm and 2%/2 mm. The plan quality, delivery efficiency and dose verification were analyzed to discuss the differences between VMAT plans based on two different planning systems. Results For patients with laryngeal cancer, the protection of organs-at-risk, the conformity index and homogeneity index of planning target area in VMAT plans based on Eclipse were similar to those in VMAT plans based on Pinnacle (P>0.05), but the monitor unit of VMAT plans based on Eclipse was less than that of VMAT plans based on Pinnacle, without statistical differences (P>0.05). For patients with rectal cancer, the monitor units, the conformity index and homogeneity index of planning target area were similar between VMAT plans based on Eclipse and VMAT plans based on Pinnacle, so was the protection of bladder and small intestine. However, the V40 of femur-L and femur-R in VMAT plans based on Eclipse for rectal cancer were superior to that in VMAT plans based on Pinnacle, without statistical differences (P>0.05). Under the criteria of 3%/3 mm and 2%/2 mm, the Gamma passing rates of VMAT plans based on Eclipse were higher than those of VMAT plans based on Pinnacle for laryngeal and rectal cancers, and the differences were statistically significant (P<0.05). Conclusion Although the plan quality and dose verification of VMAT plans based on Eclipse and Pinnacle can satisfy the requirements of clinical treatment, there is a slight difference in the passing rates of dose verification and monitor units. Further investigations should be conducted in more cases to explore the reasons for the differences.
Last Update: 2018-11-22