|Table of Contents|

Influence of different resolutions on pass rate in verification of planar dose distribution of radiotherapy plan

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

Issue:
2022 02
Page:
295-298
Research Field:
Publishing date:

Info

Title:
Influence of different resolutions on pass rate in verification of planar dose distribution of radiotherapy plan
Author(s):
HUANG Shaofu; KE Qi; XU Shaosheng; DONG Kaibi; HUANG Hecheng
Department of Radiation Oncology,the Central Hospital of Shantou，Guangdong Shantou 515031，China．
Keywords:
radiotherapy; verification of dose distribution; output resolution; Gamma pass rate
PACS:
R730.55
DOI:
10.3969/j.issn.1672-4992.2022.02.024
Abstract:
Objective：To explore the influence of different resolutions on the pass rate in the verification of planar dose distribution of radiotherapy plan.Methods:40 patients with intensity modulated radiation therapy (IMRT) admitted to our hospital from March 2017 to March 2018 were selected to verify the planar dose distribution of the radiotherapy plan.Different evaluation criteria (3 mm/3%,2 mm/2% and 1 mm/1%) were selected to analyze the change of Gamma pass rate under different evaluation criteria.According to the evaluation criteria,the changes of Gamma throughput under different output resolutions (0.6 mm,1 mm,2 mm,3 mm,4 mm,5 mm,6 mm) were analyzed.Different fields (30 cm×30 cm and 40 cm×40 cm) were selected to analyze the change of Gamma throughput.Results:The Gamma-ray passing rate of 3 mm/3% was higher than 2 mm/2% and 1 mm/1%,and that of 2 mm/2% was higher than 1 mm/1%.The difference was statistically significant (P＜0.05).When the output resolution was 3 mm,no matter what evaluation method was used,the pass rate decreased obviously.The pass rate of Gamma-ray at 4 mm,5 mm and 6 mm output resolution was lower than 0.6 mm,1 mm and 2 mm,and the difference was significant (P＜0.05).Regardless of the output resolution,the pass rate of 3 mm/3% was always higher than 2 mm/2% and 1 mm/1%,and the pass rate of 2 mm/2% was always higher than 1 mm/1%.The difference was statistically significant (P＜0.05).The Gamma-ray pass rate under the field of 30 cm×30 cm was higher than that under 40 cm×40 cm,and the difference was statistically significant (P＜0.05).Conclusion:The higher the output resolution is,the lower the pass rate of Gamma is.The pass rate is the highest when 3 mm/3% is used as the evaluation criterion.The pass rate under 30 cm×30 cm field is higher than that under 40 cm×40 cm field.

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Memo

Memo:
广东省汕头市科技计划医疗卫生类别项目（编号：181204064010552）
Last Update: 1900-01-01