|Table of Contents|

The application of CT simulator and simulator in IMRT position verification of head-and-neck cancers

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

Issue:
2017 06
Page:
948-951
Research Field:
Publishing date:

Info

Title:
The application of CT simulator and simulator in IMRT position verification of head-and-neck cancers
Author(s):
Xiao Youli; Xie Guanhui; Ou Yimin; Ni Qianxi; Zhang Jiutang
Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of Medicine,Central South University,Hunan Changsha 410013,China.
Keywords:
CT simulation machine; simulator; IMRT; position verifies; error margin
PACS:
R739.91
DOI:
10.3969/j.issn.1672-4992.2017.06.031
Abstract:
Objective:To explore the method and advantages of the GE LightSpeed RT CT and the Nucletron SIMULIX HQ simulator model in the treatment of head and neck cancer IMRT target region.Methods:Sixty patients fixed by head-neck-shoulder thermoplastic membrane with head and neck tumor IMRT were randomly divided into two groups,using the DRR Frontal&Side image in 30 cases,and 30 cases were treated with the center of the tomograph image in the CT simulator.The position difference between the directions of X (left-light),Y (head-feet),Z (front-back) three directions and the location of the treatment center were measured.The error was Ey,Ez and Ex in three directions.Results:The errors are divided into three grades Ea≤±1mm，±1mm＜Eb≤±2mm，Ec＞±2mm.CT simulation machine calibration center in the X direction of the error range of the number of cases in turn 8(26.7％),18(60.0％),4(13.3％);Y direction 19(63.3％),8(26.7％),3(10.0％);Z direction 9(30.0％),14(46.7％),7(23.3％).In Simulation calibration center X direction 6(20.0％),19(63.3％),5(16.7％);Y direction 9(30.0％),18(60.0％),3(10.0％);Z direction 8(26.7％),14(46.7％),8(26.7％).The average error of the calibration center of the CT simulator in three directions were 1.39mm 0.53mm 1.48mm Simulation were 1.51mm,1.43mm,1.66mm.60 patients were treated with the center for the first time,and the error of the IGRT was controlled by the 2mm test.Conclusion:IMRT patients with head and neck tumor fixed by head-neck-shoulder thermoplastic membrane,whether it is to take a CT simulation or a simulation of the positioning machine reset,the overall highest in the three-dimensional direction is only 40% of the displacement accuracy of the patients in 1mm,so to ensure that patients are treated,the IMRT plan to verify and modify the location of the location is very necessary.In the three-dimensional direction,the average precision of the CT simulator and simulation of the positioning machine is controlled within the 2mm.So the two devices can be applied to the location of the IMRT program verification,conducive to improving the use rate and working efficiency of the simulator.The average precision of the CT positioning method is higher than that of the average accuracy of the simulation.Mainly in the Y direction of the difference is obvious.

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Last Update: 2017-01-26