Application of fixed-jaw technique in intensity-modulated radiotherapy planning for esophageal cancer(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第7期
- Page:
- 809-813
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application of fixed-jaw technique in intensity-modulated radiotherapy planning for esophageal cancer
- Author(s):
- LIU Lingxiang; YI Lan; HUANG Xianhai; CHEN Zhaohui
- Department of Oncology, Guangzhou Panyu Central Hospital, Guangzhou 511400, China
- Keywords:
- Keywords: esophageal cancer fixed-jaw technique intensity-modulated radiotherapy dosimetry
- PACS:
- R730.55；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.07.004
- Abstract:
- Abstract: Objective To compare the dosimetric differences between fixed-jaw technique and traditional jaw conformal technique in IMRT planning for esophageal cancer, and to explore the role of field optimization by fixed-jaw technique in IMRT planning for esophageal cancer.?ethods Two kinds of IMRT plans, namely F-plan in which fixed jaw was used for some of the fields and C-plan in which all the fields were designed to be conformal to the target area, were designed for 10 patients with advanced esophageal cancer. The dose distribution, conformity index, homogeneity index and doses delivered to organs-at-risk were compared between two kinds of plans, and the total monitor units were recorded at the same time.?esults The dose distribution in the target area was basically the same. Except that the conformity index of planning clinical target volume in C-plan was slightly better than that in F-plan, with statistical differences (P<0.05), there was no significant difference in other parameters. Meanwhile, the monitor units of C-plan was lower than that of F-plan, with statistical differences (P<0.05). The difference between two kinds of plans in the Dmax of spinal cord was trivial, but the mean dose, V5, V10, V15, V20 of lungs and the dosimetric parameters of the heart in F-plan were superior to those in C-plan, with statistical differences (P<0.05).?onclusion For the IMRT plan of esophageal cancer, on the premise of meeting the clinical dosimetric requirements, fixed-jaw technique can significantly reduce the dose delivered to both lungs and the heart compared with traditional jaw conformal technique, worthy of popularization and application.
Last Update: 2021-07-26