Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (2): 111-117 doi: 10.13538/j.1001-8042/nst.22.111-117


Image quality of cone beam CT on respiratory motion

ZHANG Ke1 LI Minghui1 DAI Jianrong1,WANG Shi2   

  1. 1Department of Radiation Oncology,Cancer Institute (Hospital),Chinese Academy of Medical Sciences,Beijing 100021,China 2Department of Engineering Physics,Tsinghua University,Beijing 100084,China
ZHANG Ke, LI Minghui, DAI Jianrong, WANG Shi. Image quality of cone beam CT on respiratory motion.Nuclear Science and Techniques, 2011, 22(2): 111-117     doi: 10.13538/j.1001-8042/nst.22.111-117


In this study,the influence of respiratory motion on Cone Beam CT (CBCT) image quality was investigated by a motion simulating platform,an image quality phantom,and a kV X-ray CBCT.A total of 21 motion states in the superior-inferior direction and the anterior-posterior direction,separately or together,was simulated by considering different respiration amplitudes,periods and hysteresis.The influence of motion on CBCT image quality was evaluated with the quality indexes of low contrast visibility,geometric accuracy,spatial resolution and uniformity of CT values.The results showed that the quality indexes were affected by the motion more prominently in AP direction than in SI direction,and the image quality was affected by the respiration amplitude more prominently than the respiration period and the hysteresis.The CBCT image quality and its characteristics influenced by the respiration motion,and may be exploited in finding solutions.

Key words: Respiratory motion, Cone beam CT, Image quality