Feasibility Study on Low-Dose Protocol for Cone Beam CT
ZHANG Limin1，WANG Keqiang2
1. Department of Radiology, Tianjin Medical University General Hospital, Tianjin 300052, China丨
2. School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
Abstract：Objective To evaluate the effect of low-dose protocols on image qualities and registration accuracy of kV cone beam
CT (CBCT), and seek an optimized low-dose protocal to reduce the risk of secondary carcinogenesis caused by CBCT. Methods Low mA
protocol, fast protocol and ultra-low dose protocol were utilized as low-dose protocols in this study. The image quality and automatic
registration accuracy of CBCT images reconstructed with low-dose protocols and standard protocols in head & neck, chest and pelvis
modes were quantitatively evaluated. Results Compared with standard protocols, low-dose protocols increased noise (head &neck 5.6,
chest 4.9) and decreased low contrast resolution (head & neck 1%, chest 0.74%) in head & neck and chest scanning. Nevertheless,
low mA protocol could improve image uniformity in pelvis mode (standard: 1.9%, Low mA: 1.32%, UL-dose: 1.32%). Spatial
resolution and geometric accuracy were consistent in all protocols, 3 pairs could be distinguished and geometric uncertainties were
less than 1 mm. The registration accuracy of all protocols was no more than 0.6 mm. Conclusion Low-dose protocols of CBCT could
decrease image dose and scanning time while maintaining image quality and registration accuracy. It can be advised for children in
CBCT scan.
张丽敏1，王克强2. 锥形束CT低剂量模式可行性研究[J]. 中国医疗设备, 2021, 36(10): 144-148.
ZHANG Limin1，WANG Keqiang2. Feasibility Study on Low-Dose Protocol for Cone Beam CT. China Medical Devices, 2021, 36(10): 144-148.
