Quality re-optimization and assessment of radiotherapy plan for rectal cancer(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2024年第2期
- Page:
- 133-138
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Quality re-optimization and assessment of radiotherapy plan for rectal cancer
- Author(s):
- HUANG Lin1; 2; LIU Yimei3; CHEN Meining3; HUANG Shaomin3; DENG Xiaowu3; PENG Yinglin3; ZHANG Yu1
- 1. School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China 2. Department of Oncology, Chaozhou Central Hospital, Chaozhou 521000, China 3. Department of Radiation Oncology, Sun Yat-sen University Cancer Center/State Key Laboratory of Oncology in South China/Collaborative Innovation Center for Cancer Medicine, Guangzhou 510060, China
- Keywords:
- Keywords: rectal cancer intensity-modulated radiotherapy radiotherapy plan quality control PlanIQ plan screening
- PACS:
- R318；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2024.02.001
- Abstract:
- Abstract: Objective To evaluate the quality of treatment planning (TP) and re-optimization planning (RP) of radiotherapy for rectal cancer using PlanIQ software, thereby providing methods and tools for the screening and optimization of radiotherapy plans. Methods Twenty patients with rectal cancer who received radiotherapy were selected retrospectively, with 10 cases of intensity-modulated radiotherapy (IMRT) and 10 of volumetric modulated arc therapy (VMAT). (1) TP: IMRT plan involved 5-field irradiation, and VMAT plan involved two 360° arcs. The prescription doses were 50 Gy/25 f for PTV1 and 45 Gy/25 f for PTV2. All plans underwent direct machine parameter optimization and required 95% isodose lines to cover 100% of the target volume. Organs-at-risk (OAR) were limited by reference to tolerated dose standards. After the planning was completed, the plans were reviewed and confirmed by a physician, and the treatment was implemented after dose verification. (2) RP: a physicist with 10 years of experience re-optimized the 20 TP plans, with the irradiation technique and field setting unchanged. The re-optimization involved adjusting planning conditions and parameters based on individual experience until the dose to OAR was minimized while without affecting PTV coverage. The quality of TP plans and RP plans were quantitatively evaluated using PlanIQ software. Non-parametric Wilcoxon signed rank test was performed for dose-volume histogram parameters and plan quality index between two groups. Results The dose-volume histogram parameters in RP plans were superior to those in TP plans, and the differences in the Dmax of PTV1, the V45 Gy and Dmax of small intestine, and the V45 Gy of colon were statistically significant (P<0.05). The quality scores of RP plans for IMRT group, VMAT group and all patients were significantly higher than those of TP plans (P<0.05), with plan quality index of 88.55±3.35 vs 86.61±4.63 (P=0.005), 89.72±3.15 vs 87.21±3.04 (P=0.028), and 89.14±3.22 vs 86.91±3.22 (P=0.001), respectively. Conclusion RP can further improve the quality of radiotherapy plan for rectal cancer. PlanIQ software serves as an effective tool for quality control and screening of radiotherapy planning.
Last Update: 2024-02-27