Transcription of EPIDと ImageJによる Winston-Lutzテスト
1 EPID imagej winston - lutz winston - lutz SRS SBRT QA GAF EPID 1, 2) EPID , imagej winston - lutz EPID winston - lutz Field Ball EPID EPID EPID Varian Clinac iX EPID aS1000( cm, 1024 768 pixel) 3 mm 3 mm ( ) NIH imagej Plug-in (Microsoft Excel) RC (1,200 /10 ) Ball Ball EPID 150 cm aS1000 1pixel mm , 1 m mm/pixel 2 cm 2 cm JAW (Fig.
2 2). Fig. 1 Fig. 2 6 MV X 10MU Varian AM Maintenance DICOM DICOM 1 2 (Threshold) EPID File - Import Image Sequence imagej ImageSequence 1 SubPixel Image Adjust Size EPID 1 SubPixel SubPixel 3) Biliner Fig. 4 1024 768pixel 5 5120 3840pixel SubPixel PC Canvas Size Analyze Set Scale imagej Set Scale 1 m mm Fig.
3 5 SubPixel 5 1pixel / / 5 = mm 100pixel mm Image Adjust Threshold 2 Field Ball Threshold Field Ball Profile 2 Threshold Field Ball ( ) 15300 16000 Threshold MU EPID Threshold Analyze Analyze Particles Field Ball Analyze Particles Fig. 3 Fig. 4 Resize Fig. 5 Set Scale Analyze Particles (Fig. 8 ,Fig. 9) Result 2 1 1 1 m Fig. 10 Results 1 Gantry:0 Field,2 Gantry:0 Ball (Fig.)
4 11) Ball Field Ball Spreadsheet Analyze Particles Ball Field Field Ball ( ) Ball IGRT QA Spreadsheet IGRT QA Image center Ball .aS1000 1024 768pixel. SubPixel 5 5120 3840pixel,Image center (X,Y) = (2560,1920) . 1 m 100pixel Image center X : / 100 2560 = mm , Y : / 100 1920 = mm Fig. 8 Fig. 7 Fig. 6 Threshold Fig. 11 Fig. 9 Analyze Particles Fig. 10 Analyze Particles Results . Ball IGRT OBI(On-Board Imager) ,pixel size.
5 Plugins-Macros-Record imagej Threshold TXT ( ) imagej Download Free java 1)Lei Dong,Almon Shiu,Samuel of radiosurgery target point alignment with an electronic portal imaging device (EPID).Med. Phys. 1997;24(2):263-267 2)Tarraf Torfeh,St phane Beaumont,David Bonnet,et phantoms for the evaluation of a software used for an automatic analysis of the winston - lutz test in image guided radiation Fig. 13 ( ) Fig. 12 winston - lutz Test by NishioField center compared with BallGantryXYXYXYLat(X)Vert(Z)Long(Y) (mm)Ball(mm)Shift(mm)Coordiate(mm) Gun Target *X +X G:180 G:0 Gun Target Z+ Z* of Medical Imaging 2008; 3)
