Study on the Dose and the Calculation Time with Difference Grid Sizes
for Intensity Modulated Radiation Therapy Plan
XIE Chen1, WANG Daijie1, ZHANG Hongyan2, YANG Bo3, PANG Haowen3, SUN Xiaoyang3
1.Department of Oncology, The the People’s Hospital of Luzhou city, Luzhou Sichuan 646000, China;
2.Department of Rehabilitation Medicine, Wuhan Puren Hospital, Wuhan Hubei 430000, China;
3.Department of Oncology, The Affiliated Hospital of Southwest Medical University, Luzhou Sichuan 646000, China
Abstract：Objective To compare the difference of the dose and the calculation time among the three types grid size in the Pinnacle
radiotherapy planning system. Methods From January 2016 to December 2016, 10 cases of nasopharyngeal carcinoma radiotherapy
plans and 10 cases of cervical cancerwere plans were selected. The dose and the calculation time were recalculated and compared
while the grid size were adjusted to 2 mm×2 mm, 2 mm×4 mm, 4 mm×4 mm. Two independent sample t tests were used to
compare the differences with P<0.05 as a statistical difference. Results The mean value of the calculation time in the grid size of
2 mm×2 mm was 371.52 s, 106.43 s in the 2 mm×4 mm, 44.44 s in the 4 mm×4 mm. There was no statistical difference for the
dose among the three types grid size (P>0.05). Conclusion The difference between 2 mm×2 mm and 2 mm×4 mm was small,
while the calculation time in 2 mm×4 mm was reduced by 2/3. Therefore, the grid size of 2 mm×4 mm was recommended in
clinical practice.
谢陈1，汪代杰1， 张红艳2， 杨波3，庞皓文3，孙小杨3. 调强计划中计算网格大小对剂量与计算时间的影响[J]. 中国医疗设备, 2018, 33(9): 86-87.
XIE Chen1, WANG Daijie1, ZHANG Hongyan2, YANG Bo3, PANG Haowen3, SUN Xiaoyang3. Study on the Dose and the Calculation Time with Difference Grid Sizes
for Intensity Modulated Radiation Therapy Plan. China Medical Devices, 2018, 33(9): 86-87.
