Author: Yidong Yang, Haolin Zhan 👨🔬
Affiliation: Department of Engineering and Applied Physics, University of Science and Technology of China, University of Science and Technology of China 🌍
Purpose: To develop a fast low-dose method for beam blocker-based CBCT scatter correction and evaluate image quality in phantom study.
Methods: The full number of scatter projections were collected, the number of projections used for scatter correction is gradually reduced through a down-sampling strategy, and the number of projections used for scatter correction is determined by comparing them with high-quality images (scatter correction use the full number of scatter projections). Finally, the proposed method is validated and quantitatively analyzed using anthropomorphic head and pelvic phantoms, and compared with reference planning CT and high-quality images.
Results: In the head phantom. It reduced 97.5% additional scanning dose and time. After correction, the RMSE in CT number were decreased from 135.12±1.02 HU without scatter correction to 5.81±0.06 HU with scatter correction. In the pelvis phantom. It reduced 85.67% additional scanning dose and time. After correction, the RMSE in CT number were decreased from 178.40±0.48 HU and 104.20±0.46 HU without scatter correction to 12.21±0.56 HU and 9.62±0.96 HU with scatter correction respectively in muscle and adipose tissue.
Conclusion: Proposed method offers a universal approach to reducing additional scanning dose and time for scatter correction based on beam-blocker, holding significant clinical value for a wide range of applications.