TITLE:
Delivered Dose Verification for Lung Cancer Stereotactic Body Radiotherapy Using Cone-Beam CT
AUTHORS:
Yechao Feng, Xi Liu, Xiang Pan, Chang Hu, Ning Zhan, Zongda Zhu, Zhenxiang Deng
KEYWORDS:
Lung Cancer, Stereotactic Body Radiotherapy, Cone Beam CT, Dose Verification
JOURNAL NAME:
Journal of Cancer Therapy,
Vol.12 No.7,
July
26,
2021
ABSTRACT: Purpose: Verified the delivered dose distribution of lung
cancer Stereotactic Body Radiotherapy (SBRT)
using the cone-beam CT images. Methods: Twenty lung cancer patients who underwent SBRT with 100 CBCT
images were enrolled in this study. Delivered dose distributions
were recalculated on CBCT images with the deformed and non-deformed methods, respectively. The planned and delivered dose distributions were compared using the dose-volume histograms. Results: The delivered target coverage (V100)
per patient inside target volume deviated on average were 0.83% ± 0.86% and
1.38% ± 1.40% for Pct vs. Pcbct and Pct vs. Pdcbct, respectively. The
Conformity Index (CI) and Gradient Index (GI) showed a good agreement among the
plans. For the critical organs, only minor differences were observed between
the planned dose and the delivered dose. Conclusions: CBCT images were a useful tool for setup and dose delivery verification for lung cancer patients who underwent SBRT.