Investigation of misalignment in analyzer crystal based-CT and its effect.
Analyzer crystal-based computed tomography (ACB-CT) is a novel x-ray phase contrast computed tomography technique. In this paper, in order to extract the refraction angle, we analyzed the effect of misalignment on tomography-sliced images of ACB-CT. Two different methods were considered: the first, proposed by Chapman and Dilmanian, was based on two sets of projective image data taken at both sides of the rocking curve and with a half circle sample rotation and the second, recently proposed by our team, was based on only one set of projective image data taken at one side of the rocking curve but with a full circle sample rotation. Theoretical analysis and experimental results will show that the second method improves the quality of reconstructed CT images, also simplifying the ACB-CT data acquisition procedure.
Zhang
Kai
K
Institute of High Energy Physics, Chinese Academy of Science, Beijing, People's Republic of China.
Zhu
Peiping
P
Huang
Wanxia
W
Yuan
Qingxi
Q
Li
Enrong
E
Liu
Yijin
Y
Liu
Xiaosong
X
Wang
Zhili
Z
Wu
Ziyu
Z
D000465:Algorithms; D016477:Artifacts; D018360:Crystallography, X-Ray / Q000295:instrumentation* / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D011856:Radiographic Image Enhancement / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods*