A multi-parameter morning check method for pencil-beam scanning proton therapy
10.3760/cma.j.cn113030-20241111-00431
- VernacularTitle:用于笔形扫描质子束的多参数晨检方法
- Author:
Chao SHAN
1
;
Zhipeng LIU
;
Yangfan ZHANG
;
Yanmei ZHANG
;
Tao MA
;
Hongyu ZHAO
;
Tao SUN
;
Xiaoming LU
Author Information
1. 中国科学技术大学附属第一医院离子医学中心（合肥离子医学中心）临床物理与技术科，合肥230038
- Publication Type:Journal Article
- Keywords:
Proton therapy;
Scanning pencil beam;
Morning quality assurance
- From:
Chinese Journal of Radiation Oncology
2025;34(7):692-696
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To design a morning quality assurance method for pencil-beam scanning proton system to achieve integrated measurement of multiple parameters.Methods:A functionally partitioned morning check phantom was designed and manufactured, which was fixed to a specific position on the treatment bed with a 3D-printed clip, along with the two-dimensional matrix ionization chamber, for consistency checks of proton field and beam-related parameters. Additionally, a groove for an imaging phantom was reserved on one side of the clip for the functional check of the onboard imaging guidance system. The sensitivity and specificity of the aforementioned morning check method were tested, demonstrating its effectiveness. The morning check data from a rotating beam treatment room at the Hefei Ion Medical Center over a continuous period of 7 months (126 d) were analyzed. The output, field flatness, symmetry, field size and the duration of morning check were observed.Results:The results showed that the changes in the output, field flatness, and symmetry were all within 1%, the change in the field size was within 0.5 mm, and the range variations for both 155 MeV and 240 MeV energy levels were within 1 mm. The changes in the spot size for the four energy levels of 100 MeV, 130 MeV, 160 MeV, and 190 MeV were all within 2%, and the spot position deviations were within 1.5 mm. The entire morning check process could be completed within 20 min.Conclusions:The morning check method designed and manufactured in this study specifically for pencil-beam scanning proton therapy can efficiently and integrally measure various proton system parameters and can be used as an implementation method for clinical proton therapy morning check.
