Research on the precision and stability of optical surface imaging technology in guiding radiotherapy positioning
10.3760/cma.j.issn.1004-4221.2018.04.011
- VernacularTitle:OSI用于引导放疗摆位精度和稳定性研究
- Author:
Lu YANG
1
;
Renming ZHONG
;
Guangjun LI
;
Jiuling SHEN
;
Liqin LI
;
Sen BAI
Author Information
1. 430060,武汉大学人民医院放疗科
- Keywords:
Optical surface imaging;
Tomography,X-ray computed,cone-beam;
Active breathing control
- From:
Chinese Journal of Radiation Oncology
2018;27(4):387-391
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the precision and stability of optical surface imaging (OSI)system Catalyst in guiding radiotherapy positioning.Methods A total of 52 patients with five different tumor sites who underwent cone-beam computed tomography (CBCT)-guided radiotherapy were recruited in this investigation.For the first treatment fraction,the setup error was recorded as C after online CBCT correction,and the surface images of patients taken by Catalyst were set as the reference images Cref.For the following treatment fraction,patients were pre-corrected according to the Catalyst Cref image with the acceptable errors within 2 mm/ 2,and the pre-corrected errors were recorded as C1.Then,after online CBCT correction,the setup errors were recorded as C.The errors between post-corrected Catalyst surface image and Cref image were recorded as C2.For each treatment fraction,the difference between Catalyst correction errors C1 and CBCT corrected errors C was recorded as d1,and the difference between the post-corrected Catalyst errors C2 and Cref image was recorded as d2.d3=d1-d2.The values of d1 and d3 in the 6 dimensions were analyzed using single sample t-test.The correlation between C-C1 and d1-d2 was statistically analyzed by Pearson correlation analysis.Results The mean value of d1 and d3 for 52 patients were within 2 mm/2 °.CBCT-C1 and d1-d2 were both significantly correlated (R =3,7,P=0.00,0.01).Conclusions OSI system yield high accuracy and stability in radiotherapy positioning,which is of certain significance in radiotherapy positioning for cancer patients.
