|Table of Contents|

Effect of computational grid size on the validation rate of brain metastases

Journal Of Modern Oncology[ISSN:1672-4992/CN:61-1415/R]

Issue:
2024 15
Page:
2845-2851
Research Field:
Publishing date:

Info

Title:
Effect of computational grid size on the validation rate of brain metastases
Author(s):
SUN Bin; ZHONG Siyao; NAN Xianxiu; XU Cheng; GAO Yuyan
Department of Radiotherapy,Beijing Luhe Hosiptal Affiliated to Capital Medical University，Beijing 101100,China.
Keywords:
computational grid; computational time; brain metastases; Gamma pass rate
PACS:
R739.41
DOI:
10.3969/j.issn.1672-4992.2024.15.024
Abstract:
Objective:To investigate the effect of different computational grid sizes of Acuros XB algorithm in Eclipse planning system on the pass rate of brain metastases planning.Methods:17 patients with brain metastases were selected for whole brain and metastatic focus radiotherapy.Eclipse 15.5 planning system was used to design three full arc plans for the selected patients.Acuros XB algorithm was used to calculate the planned dose for each patient using 0.25 cm,0.20 cm,0.15 cm and 0.10 cm calculation grids,and record the calculation time of different grid plans.Electronic portal imaging device(EPID) was used for data acquisition,and the Gamma pass rates of 3%/3 mm,3%/2 mm,3%/1 mm,2%/3 mm,and 1%/3 mm were obtained by Portal Dosimetry analysis，the Gamma passing rates of different grids were compared analyzed.Results:With the decrease of computational grid sizes,the planned calculation time increased several times,and the difference was statistically significant(P＜0.05).When the grid size was reduced from 0.15 cm to 0.10 cm,the calulation time increased by an average of 18 minutes.For the planned pass rate,except fo the 3%/1 mm Gamma pass rate of 0.10 cm and 0.15 cm,which had no difference(P=0.356),Gamma passing rate of 0.10 cm grid size was better than 0.25 cm,0.20 cm and 0.15 cm(P＜0.05).At the same time,with the decrease of the grid,the increase of the pass rate gradually slowed down,and the difference between the pass rate of 0.10 cm and 0.15 cm was very small.Conclusion:For whole brain and metastatic push plans,using 0.15 cm grid can increase the plan pass rate without significantly increasing the calculation time.

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Memo

Memo:
首都医科大学附属北京潞河医院青年科研孵育专项（编号：LHYY2020-LC07）
Last Update: 2024-06-28