Independent verification of monitor unit calculation for radiation treatment planning system
- VernacularTitle:放射治疗计划系统剂量跳数计算的独立验证
- Author:
Chen LI
1
,
2
;
Chen LI-XIN
;
Huang SHAO-MIN
;
Sun WEN-ZHAO
;
Sun HONG-QIANG
;
Deng XIAO-WU
Author Information
1. 华南肿瘤学国家重点实验室,广东,广州,510060
2. 中山大学肿瘤防治中心放疗科物理室,广东,广州,510060
- Keywords:
Treatment plan verification;
independent calcutation;
phantom measurement;
quality assurance
- From:Chinese Journal of Cancer
2010;29(2):234-239
- CountryChina
- Language:Chinese
-
Abstract:
Background and Objective:To ensure the accuracy of dose calculation for radiation treatment plans is an important part of quailty assurance(QA)procedures for radiotherapy.This study evaluated the Monitor Units (MU) catculation accuracy of a third-pany QA software and a 3-dimensional treatment planning system(3-D TPS),to investigate the feasibility and reliability of independent verification for radiation treatment planning.Methods:Test plans in a homogenous phantom were designed with 3-D TPS,according to the International Atomic Energy Agency(IAEA)Technical Report No.430,including open,blocked,wedge,and multileaf collimator(MLC) fields. (1) Test plans were delivered and measured in the phantom.The delivered doses were input to the QA software and the independent calculated MUs were compared with delivery. (2) All test plans were verified with independent calculation and phantom measurements separately, and the differences of the two kinds of verification were then compared.Results:(1) The deviation of the independent calculation to the measurements was(0.1 4±0.9)%,the biggest difference fell onto the plans that used block and wedge fields(2.0%). (2)The mean MU difference between the TPS and the QA software was(0.6±1.0)%, ranging from-O.8%to 2.8%.The deviation in dose of the TPS calculation compared to the measurements was (-0.2±party QA software is clinically acceptable.Similar results were achieved withthe independent calculations and the phantom measurements for all test plans.The tested independent calculation software can be used as an efficient tool for TPS plan verification.
