Abstract Objective To explore the MatriXX measurements the dose distributions for each beam in intensity-modulated radiotherapy (IMRT) plans were measured with 0 degree gantry angle and actual gantry position respectively. To discuss whether the two multi-angle synthetic pass rate from the two methods has statistics differences. Methods The dose distributions for each beam in IMRT plans were measured with 0 degree gantry angle and actual gantry position for twelve patients with head and neck tumor respectively. The γ pass rates (according to 3%/3 mm) for each beam under each angle condition was obtained by the comparison between the measured and the calculated dose distributions from the treatment planning system which was treated as the reference distribution. Use the t-test to analyse the actual gantry angle method and use the one factor analysis of variance to analyze the two multi-angle synthetic pass rate from the two methods. Results The γ pass rates of actual gantry angle was found generally declined seemingly compared with 0 degree gantry angle, but differentγ pass rates showed only in 80 °, 120°and 240° with 98.71%, 93.59%(t=2.10,P=0.000),98.15%,93.17%(t=2.10,P=0.000) and 98.94%,92.85%(t=2.10,P=0.000) respectively. The γ pass rate of multi-angle synthetic was seemingly between methods (98.27%,94.63%,F=0.50,P=0.134). Conclusions Two kinds of IMRT verification mode are from two position to validated the IMRT plans dose accuracy,comparatively analysing the conclusions drawn from the two methods can protect accuracy of IMRT plans more comprehensively.
Corresponding Authors:
HU Chun-hong,Email:chunhong_hu@hotmail.com
E-mail: chunhong_hu@hotmail.com
Cite this article:
DAI Yue,HU Chun-hong,LI Xiao-dong et al. Analyse two kinds of intensity-modulated radiotherapy verification methods comparatively by using the MatriXX[J]. Chinese Journal of Radiation Oncology, 2013, 22(4): 312-314.
DAI Yue,HU Chun-hong,LI Xiao-dong et al. Analyse two kinds of intensity-modulated radiotherapy verification methods comparatively by using the MatriXX[J]. Chinese Journal of Radiation Oncology, 2013, 22(4): 312-314.
[1] 胡逸民,张红志,戴建荣.肿瘤放射物理学.北京:原子能出版社,1999. [2] 陆佳扬,李乐升.MatrixX与胶片在模体平面剂量验证中的比较.医疗装备,2012,2:12-13. [3] 冯国生,梁远,吴丹玲,等.调强放射治疗两种剂量验证方法的比较.广西医科大学学报.2009.26:390-392. [4] Shimohigashi Y, Araki F, Tominaga H,et al.Angular dependence correction of MatriXX and its application to composite dose verification.J Appl Clin Med Phys,2012,6:198-214. [5] Boggula R, Birkner M, Lohr F, et al.Evaluation of a 2D detector array for patient-specific VMAT QA with different setups.Phys Med Biol,2011,56:7163-7177. [6] Li QL, Deng XW, Che LX.The angular dependence of a 2-dimensional diode array and the feasibility of its application in verifying the composite dose distribution of intensity-modulated radiotherapy.Chin J Cancer,2010,29:617-620. [7] 张建英.插值对二维电离室矩阵调强验证Gamma通过率的影响.中国医学物理学杂志,2010,11:224-226. [8] 徐庆丰,周莉,李涛,等.重力对二维探测器阵列验证静态调强计划的影响.华西医学,2010,12:2143-2146. [9] Nelms BE, Simon JA.A survey on planar IMRT QA analysis. J Appl Clin Med Phys,2007,17:2448. [10] Wolfsberger LD, Wagar M, Nitsch P, et al.Angular dose dependence of MatriXX TM and its calibration.J Appl Clin Med Phys,2010,11:3057. [11] Saminathan S, Manickan R, Chandraraj V, et al.Dosimetric study of 2D ion chamber array matrix for the modern radiotherapy treatment verification.J Appl Clin Med Phys,2010,11:3076. [12] Dobler B, Streck N, Klein E, et al.Hybrid plan verification for intensity-modulated radiation therapy (IMRT) using the 2D ionization chamber array I′mRT MatriXX-A feasibility study.Phys Med Biol,2010,55:39-55.
2013, Vol. 22 
