Effect of cone-beam computed tomography image-guidance on the setup errors of stereotactic body radiotherapy for spinal metastatic tumors
10.3760/cma.j.cn115355-20220629-00404
- VernacularTitle:锥形束CT图像引导对脊柱转移瘤立体定向放疗摆位误差的影响
- Author:
Dan YUE
1
;
Xindi LI
;
Xiaoyue QUAN
;
Shuchang LI
;
Hongfen WU
;
Shixin LIU
Author Information
1. 吉林省肿瘤医院放疗五科，长春 130012
- Keywords:
Spinal neoplasms;
Neoplasm metastasis;
Radiotherapy, image-guided;
Cone-beam computed tomography;
Radiosurgery;
Radiotherapy setup errors
- From:
Cancer Research and Clinic
2023;35(4):271-277
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the effect of image-guided with cone-beam computed tomography (CBCT) based on volumetric modulated arc therapy (VMAT)-flattening filter free (FFF) on the setup errors of stereotactic body radiotherapy (SBRT) in patients with spinal metastatic tumors.Methods:The clinical data of 15 patients with spinal metastatic tumors who underwent SBRT in Jilin Cancer Hospital from August 2020 to January 2022 were retrospectively analyzed. The radiotherapy dose of bone metastasis was 32 Gy per 4 times and CBCT scanning was performed before and after radiotherapy. Every patient received radiotherapy 4 times; all 15 patients underwent SBRT 60 times in total and 120 CBCT volume images were finally obtained and analyzed. The systematic error (Σ) and random error (σ) were calculated at different correction threshold levels. The translational setup error and rotational setup error at the left-right (X axis), head-foot (Y axis) and front-back (Z axis) directions before and after radiotherapy were compared, which were expressed as Σ ± σ.Results:The pre-SBRT and post-SBRT translational setup errors were (0.14±0.27) cm and (0.07±0.19) cm, respectively ( P<0.001) in the X direction, (-0.05±0.33) cm and (0.00±0.19) cm, respectively ( P = 0.001) in the Y direction, (-0.13±0.19) cm and (-0.02±0.14) cm, respectively ( P = 0.012) in the Z direction. The pre-SBRT and post-SBRT rotational setup errors were (-0.31±0.76)° and (-0.09±0.34)°, respectively ( P < 0.001) in the X direction, (-0.13±0.88)° and (-0.07±0.36) °, respectively ( P < 0.001) in the Y direction, (0.10±0.51)° and (0.16±0.38)°, respectively ( P < 0.001) in the Z direction. Conclusions:CBCT correction could reduce Σ and σof the translational setup and rotational setup, increase the accuracy of SBRT based on VMAT-FFF for patients with spinal metastatic tumors.
