Feasibility of using orthogonal kilo-voltage fluoroscopic imaging for setup correction in the liver-cancer radiotherapy
10.3760/cma.j.issn.1004-4221.2011.03.018
- VernacularTitle:利用正交千伏级X线透视图像修正肝癌放疗摆位误差的可行性研究
- Author:
Shengchao JIAO
;
Jianrong DAI
;
Weihu WANG
;
Kuo MEN
;
Minghui LI
;
Guishan FU
;
Nan BI
;
Yexiong LI
- Publication Type:Journal Article
- Keywords:
Orthogonal kilo-voltage fluoroscopic imaging;
Tomography,X-ray computed,conebeam;
Digitally reconstructed radiograph;
Image registration
- From:
Chinese Journal of Radiation Oncology
2011;20(3):233-235
- CountryChina
- Language:Chinese
-
Abstract:
Objective The aim of this study is to evaluate the feasibility of using orthogonal kilo voltage fluoroscopic imaging(OKVFI)for setup correction in image guided radiotherapy of the liver.Methods After positioned the patients with liver cancer implanted with silver rings on the accelerator equipped with kilo voltage X-ray volume imaging(XVI),averaged OKVFI and cone beam CT(CBCT) volumetric images were acquired.A total of 90 datasets of averaged OKVFI and 90 datasets of volumetric images for 10 patients were obtained.The couch shifts obtained by the matching between OKVFI and digitally reconstructed radiograph were compared tu those achieved by the registration between CBCT and 4D reference average CT.On the comparison of the two different matching metheds.the Pearson coefficient was used to analyzed the correlation and Bland-Altman analysis to discern the consistence.Results The Pearson coefficient of correlation for the patient position shifts were R2=0.821.0.771 and 0.909 in the left-right (LR),anterior-posterior(AP)and superior-inferior(SI)directions respectively.95% CI were-2.30 -1.53(LR),-2.06-3.01(AP)and-2.69-1.53(SI)respectively.Within a±3 mm tolerance were 97.78%.95.56%and 96.67%respectively.Conclusions OKVFI has hish correlation and consistence with CBCT image on the setup correction.It is feasible to implement position correction with OKVFI in clinic practice.
