Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (5): 50101-050101.doi: 10.11889/j.0253-3219.2019.hjs.42.050101


Effects of the probe divergence degree on the imaging quality of multi-slice 3D ptychography

Wei NIE1,3,4,Zijian XU1,2(),Xulei TAO1,2,3,Renzhong TAI1,2,Zhiyuan ZHU1,2,4()   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
    4. ShanghaiTech University, Shanghai 201210, China
  • Received:2018-11-01 Revised:2018-12-29 Online:2019-05-10 Published:2019-05-16
  • Contact: Zijian XU,Zhiyuan ZHU ZHU Zhiyuan;; ZHU Zhiyuan;
  • About author:NIE Wei, male, born in 1992, graduated from Lanzhou University in 2013, master student, focusing on coherent diffraction imaging|NIE Wei, male, born in 1992, graduated from Lanzhou University in 2013, master student, focusing on coherent diffraction imaging|XU Zijian, E-mail: ZHU Zhiyuan, E-mail:|XU Zijian, E-mail: ZHU Zhiyuan, E-mail:
  • Supported by:
    Supported by National Natural Science Foundation of China(No.11575283, No.11875316, No.U1832146)

Abstract: Background

Ptychography technology has been applied widely nowadays, and has made great achievements in the fields of materials, energy and life sciences. Traditional Ptychography 3D imaging is based on the computational tomography technology with multi-angular projection which has the disadvantages of low-efficiency and high-dose. The emerging multi-slice 3D imaging approach opens up a new way for high-efficiency low-dose 3D imaging.


This study aims to improve the reconstruction convergence and imaging quality of the multi-slice ptychographic tomography with emphasis on the effect of the illumination divergence degree on the reconstructed image of this approach.


First of all, a numerical simulation method was employed to optimize the relaxation parameters. Then the effect of divergence of incident X-ray on reconstruction quality of multi-slice method was investigated by simulation experiments. Finally, the reconstructed images were compared directly with the ground-truth original images, and an error metric was calculated for monitoring the convergence of the reconstruction and measuring the quality of the reconstructed image.


It was found that the higher the divergence degree of the incident beam, the faster the iterative reconstruction converges, and the better the reconstructed image quality.


The choice and setting of the focusing optical devices are significant in multi-slice ptychographic tomography experiments, a zone-plate with a smaller outermost zone width or an X-ray beam with lower energy in such experiments are helpful to obtain a better imaging quality by using multi-slice 3D ptychography approach.

Key words: X-ray ptychography, Multi-slice 3D imaging, Incident X-ray divergence degree, Zone-plate focusing

CLC Number: 

  • TL99