Application of 2-D Ionization Chamber Array For Validation of Electron Arc Therapy Plan
10.3969/j.issn.1005-202X.2010.01.007
- VernacularTitle:电离室阵列在电子束旋转照射剂量验证中的应用
- Author:
Hongqiang SUN
;
Lixin CHEN
;
Xiaowu DENG
;
Wenzhao SUN
;
Shaomin HUANG
;
Li CHEN
- Publication Type:Journal Article
- Keywords:
electron arc therapy;
ionization chamber array;
planar dose distribution;
gamma pass rate
- From:Chinese Journal of Medical Physics
2010;27(1):1594-1598,1620
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To inspect the dosimetry characteristic of a 2-D ionization chamber array and its response to oblique incident electron beam.And to discuss feasibility to using it to validate the electron arc therapy plan.Materials and methods:(1)The 2-D ionization chamber array was calibrated referring to a themble chamber,comparing the response to electron beams with incidence angle ranged from-50°to 50°.(2)Phantom test plans of 6 and 10MeV electron beam arc therapy were designed,with the beam rotation arcs of 30°,60°and 90° respectively,symmetric to the Central axis of 0°gantry angle.Dose distribution of each plan was verifled with the 2-D array.Results:(1)Measurement differences between the central detector of the array and the thimble chamber were less than 2%,under the planned oblique inddent 6/10MeV electron beam.(2)For the all test plans,dose error was less than 3%at dmax in the symmetric axis of the electron beam arcs.Off-axis dose error was less than 2%within the central 70%area of the profile in non-rotating direction,and smaller than 1.5%in the rotational direction.The measured dose distribution had good agreement with the TPS calculation in isodose curves between 100%and 20%.The gammapass rates(△D=5%,△d=5cm)were 99.98%、99.89%、99.74%、98.64%、99.16%and 99.44%respectively for 6 and 10 MeV plans with electron beam arcs of 30°,60°and 90°.Conclusion:it is practicable using the tested 2-D ionization chamber array to verify and validate the electron beam arc therapy plan.
