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Development and application of a high energy x-ray digital radiography nondestructive testing system for a driving mechanism

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Journal of Advanced Dielectrics 2014年第2期4卷 60-62页

作者： Bailin Zheng Kai Zhang School of Aerospace Engineering and Applied Mechanics Tongji University 1239 Siping RoadShanghai 200092P.R.China

A high energy x-ray digital radiography(DR)nondestructive testing(NDT)system has been developed to detect the operating state of a driving *** system consists of five main subsystems,namely,x-ray generator,image intensifier,image processor,mechanical platform and control *** to the mechanical platform,the x-ray generator and image intensifier are able to rotate around the vertical axis from 0°to 360°in 35 s and move along vertical axis within the range of 500 mm in 20 *** 450 kV x-ray generator provides a maximum 100 mm penetration depth and a coverage angle of 40°,and the resolution of the scanned image is 66 lp/*** is indicated by its applications,the system is featured with fast scanning speed,wide detection range and high imaging *** can be applied to inspect the defects in the driving mechanism as well.

关键词： high energy x-ray digital radiography(DR) nondestructive testing(NDT)

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Atomic pair distribution function method development at the Shanghai Synchrotron Radiation Facility

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Chinese Physics B 2017年第7期26卷 262-269页

作者：周晓娟陶举洲郭瀚林鹤 Institute of high energy Physics Chinese Academy of Sciences Dongguan Institute of Neutron Science University of Chinese Academy of Sciences Shanghai Institute of Applied Physics Chinese Academy of Sciences

The atomic pair distribution function（PDF） reveals the interatomic distance in a material directly in real-space. It is a very powerful method to characterize the local structure of materials. With the help of the third generation synchrotron facility and spallation neutron source worldwide, the PDF method has developed quickly both experimentally and theoretically in recent years. Recently this method was successfully implemented at the Shanghai Synchrotron Radiation Facility（SSRF）. The data quality is very high and this ensures the applicability of the method to study the subtle structural changes in complex materials. In this article, we introduce in detail this new method and show some experimental data we collected.

关键词： atomic pair distribution function x-ray scattering local structure high energy x-ray

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Investigation and Application of high Megavoltage x-ray Imaging Mode in Radiotherapy

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2016年第1期5卷 42-50页

作者： Quanshi Zhang xiwen Wang Qiyin Sun Yuehui Jin Yun Li Ziyu Li Tao Sun Liang Wang The Cancer Affiliated Hospital of Soochow University American Fox Chase Wuxi Cancer Center Wuxi China

After drawbacks and shortages of using conventional kV or MV imaging mode were analyzed, this study proposes a new position verification mode with using the energy larger than 15 MeV or nominal accelerating potential greater than 25 MV x-ray. The new position verification mode is named HMV imaging mode. Along with the comparison of theoretical analyses, phantom experiments and clinical results to the original imaging modes, this report is going to demonstrate the HMV imaging mode is superior to traditional kV and MV imaging modes. This report first theoretically analyzed three main effects of x-ray interacting with medium by numerous equations and compared their mass attenuation coefficient with different types of tissue. x-ray irradiated on a “Catphan 500” cylinder phantom with different energies to verify these theoretical results. Furthermore, based on phantom experiments’ results, we have done numerous clinical trials and comparisons with patient’s clinical results. The theoretical and experimental results illustrate that the scanned images from HMV mode have a good quality and have ability to identify different tissue components clearly. HMV imaging mode overcomes drawbacks of position verification from both kV and MV level imaging mode as well as keeping advantages of kV and MV imaging mode. The result indicates that HMV is a good position verification mode in radiotherapy.

关键词： high energy x-ray x-ray Imaging Mode Position Verification Reaction Cross-Section

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