Comparative Analysis of the Effect of Arcs per Beam of VMAT on the Treatment Plan in
MONACO Treatment Planning System
XUE Tao1, HE Xiaoyang2, SUN Yunchuan1, LIU Guangbo1, WANG Bin1, LIU Zhikun1, YAN Huijuan1,
ZHOU Lixia1, WANG Peiye1
1. Department of Radiotherapy, Cangzhou Hospital of Integrated TCM-WM Hebei, Cangzhou Hebei 061000, China;
2. Department of Intrarenal and Urology, Cangzhou People’s Hospital (Medical College Campus), Cangzhou Hebei 061000, China
Abstract：Objective To evaluate the effect of Arc per beam of VMAT on dose distribution, plan execution and pass rate of
dose verification in MONACO treatment planning system. Methods A total of 32 patients with cervical cancer were retrospectively
analyzed. In the original treatment plan, there were two beams with 1 Arc per beam (1APB). Under the same contour outline and
parameter constraints with the original treatment plan, the radiation field parameter was changed to one beam with two Arc per beam
(2APB). Under the standard of 95% prescription dose for 100% volume, conformity index (CI) and homogeneity index (HI) of target
area, irradiation dose of organs at risk, control point (CP) and monitor units (MU) of treatment plan, execution time of treatment plan
and pass rate of dose verification were evaluated. Results The mean values of CI, HI, and irradiation dose of organs at risk of two
plans were similar, with no significant difference (P>0.05). Compared with 1APB plan, 2APB plan had significantly reduced CPs and
MUs (P<0.05). In term of plan implementation, the implementation time of 2APB plan was significantly shorter than that of 1APB
plan (P<0.05). In term of dose output verification of two plans, the dose pass rate was similar, with no significant difference (P>0.05).
Conclusion The dosimetry differences between the two treatment plans are similar, which can meet the clinical requirements.
However, the implementation efficiency of 2APB plan has been greatly improved compared with that of 1APB, which can improve
the overall work efficiency while reducing the loss of treatment equipment.
薛涛1，何晓阳2，孙云川1，刘光波1，王斌1，刘志坤1，闫慧娟1，周丽霞1，王珮烨1. MONACO放疗计划系统VMAT计划照射野Arc数目对治疗计划影响的比较分析[J]. 中国医疗设备, 2019, 34(9): 74-76.
XUE Tao1, HE Xiaoyang2, SUN Yunchuan1, LIU Guangbo1, WANG Bin1, LIU Zhikun1, YAN Huijuan1,
ZHOU Lixia1, WANG Peiye1. Comparative Analysis of the Effect of Arcs per Beam of VMAT on the Treatment Plan in
MONACO Treatment Planning System. China Medical Devices, 2019, 34(9): 74-76.
