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- W2372364208 abstract "Objective: To use three radiotherapy verification of position(KV-KV、KV-MV and CBCT)from Varian-OBI syetem,analysis the difference between 2 dimensions and 3 dimensions verification,try to find the best application of IGRT for head and neck IMRT patients.Methods: 10 head and neck IMRT patients were selected,each patient got a verification of position before treatment once a week,2D position verification(KV-KV/KV-MV)was used in the first place,shift the couch position according to the verification results,then 3D-CBCT was used,the deviation between reference image and acquisiton image in translational(Vertical,Longitudinal,Lateral) and correspond rotational orientation(Rtn=Yaw,Roll,Pitch,)were recorded,the mean and standard errors of them were calculated by statistical software,and the time and more parameters of three verification modles were recorded and compared.Results: Fifty-three image sets were collected,the mean and standard errors of three trans lational(Vertical,Longitudinal,Lateral) position deviation were KV-KV:(-0.006±0.141)cm,(0.148±0.269) cm,(-0.063±0.254) cm;KV-MV:(-0.01±0.145) cm,(0.09±0.323) cm,(-0.115±0.232) cm;CBCT:(0.04±0.12) cm,(0.06±0.12) cm,(0.00±0.14) cm.KV-KV:94%,85%,91%;KV-MV:90%,85%,95%,≤3 mm in Vertical,≤5 mm in Longitudinal and Lateral orientation,the absolute maximum were 0.4 cm,0.6 cm and 0.6 cm.in KV-KV and 0.5cm,0.9 cm and 0.6 cm in KV-MV.CBCT: 100%,94%,100%,≤3mm in Vertical,≤5mm in Longitudinal and Lateral orientation,the absolute maximum were 0.2cm,0.3 cm and 0.2 cm.the mean and standard errors of three rotational(Rtn,Roll,Pitch,)deviation were(-0.38±1.66) °,(0.36±1.51) °,(-0.3±0.87)°,the absolute maximum were 4.3°,3.8°,2.7°.92%,96%,100%,≤±3° in Rtn,Roll and Pitch orientation.77%,81%,96%,≤±2° in Rtn,Roll and Pitch orientation.the time of acquisiton image were:KV-KV:1′20″,KV-MV: 2′,CBCT: 35″.The time of registration were KV-KV: 5′,KV-MV: 5′~8′,CBCT: 10′~15′.No statistically signficant difference between KV-KV and KV-MV(p0.05),the two registrations of CBCT(Auto vs Auto+Manual)had no statistically signficant difference(p0.05).Conclusions: The total time(include the time of acquistion and registration)of KV-KV was about half of KV-MV,MV image has low resolution,registration accuracy was difficult to guarantee,should give priority to KV-KV model in the two-dimensional position verification.compared to CBCT,KV-KV could reduce translational deviation to 2mm,and the total time of KV-KV was about one third of CBCT.The precision of KV-KV two-dimensional position verification is conceivable,and the time is short as compared to CBCT.It can make the IGRT being fully used." @default.
- W2372364208 created "2016-06-24" @default.
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- W2372364208 date "2010-01-01" @default.
- W2372364208 modified "2023-09-25" @default.
- W2372364208 title "The Comparation of 2D Kilovoltage with Kilovoltage-Megavoltage Radiographs and Conebeam Computed Tomography in Position Verification of Head and Neck Intensity Modulate Radiotherapy" @default.
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