Research on patient motion monitoring with domestic innovative integrated radiotherapy CybeRay ? real-time imaging for frameless stereotactic radiosurgery
10.3760/cma.j.cn113030-20240206-00046
- VernacularTitle:国产创新一体化放疗设备CybeRay ?用于无框立体定向放疗的研究
- Author:
Lihong CAI
1
;
Wenbo GUO
;
Jing NIE
;
Yali WU
;
Minjie ZHANG
;
Huina SUN
;
Xinsheng XU
;
Gaoqing FENG
;
Rui ZHANG
;
Qingfang JIANG
;
Yu ZHANG
;
Yubing XIA
Author Information
1. 开封市肿瘤医院放疗科，开封市放射肿瘤学重点实验室，开封 475000
- Keywords:
Radiotherapy, gamma ray stereotactic;
Domestic innovative integrated radiotherapy equipment;
Real-time imaging;
Brain neoplasms;
Stereotactic radiosurgery
- From:
Chinese Journal of Radiation Oncology
2024;33(12):1138-1143
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To determine the motion detection uncertainty of the real-time CybeRay ? imaging system and patient intrafractional motion with thermoplastic mask-based immobilization. Methods:Real-time CybeRay ? imaging system was used for irradiation and treatment for head phantom and patients with brain tumors. All patients were immobilized with thermoplastic masks. Real-time imaging was delivered using kilovoltage projection images during radiotherapy. The detected patient motion data was collected from 5 head phantom measurements and 27 treatment fractions of 9 brain tumor patients admitted to Kaifeng Cancer Hospital. The accuracy and uncertainty of the motion monitoring system were determined. Results:The mean and standard deviation (SD) of the detected motion in the X, Y, and Z directions for phantom were (-0.02±0.41) mm, (-0.05±0.22) mm and (0.01±0.35) mm, respectively. The detected motion in the X, Y and Z directions for patents were (-0.13±0.48) mm, (-0.05±0.48) mm and (0.11±0.36) mm, respectively. After removing the motion detection uncertainty, the actual intrafractional motion of patients were (-0.11±0.25) mm, (0±0.43) mm and (0.10±0.08) mm in three directions, respectively. Conclusions:The uncertainty of real-time imaging-based motion monitoring system of CybeRay ? is less than 0.5 mm. It is feasible to apply thermoplastic masks for brain tumor patients in clinical practice, which can provide steady immobilization and limit the SD of patient intrafractional motion within 0.5 mm. Real-time imaging-based motion monitoring system of CybeRay ? is accurate for patient motion monitoring during frameless stereotactic radiosurgery/radiotherapy.
