Electron Density Measurement Using Multi-Energy X-Rays from a Conventional Laboratory X-Ray Source

2019 ◽  
Vol 888 ◽  
pp. 83-88 ◽  
Author(s):  
Akie Nagao ◽  
Toshinori Yamazaki ◽  
Masami Torikoshi ◽  
Naoki Sunaguchi ◽  
Tatsuaki Kanai ◽  
...  

We have proposed a method to obtain the electron density and effective atomic number from the attenuation coefficients of multi-energy X-rays. The simulations were performed using NIST’s database and demonstrate that our approach can facilitate electron density measurements within accuracy of 1% in a human body. The proposed method exhibited an improvement in the accuracy of electron density measurements, which were obtained from experimental linear attenuation coefficients using a conventional laboratory X-ray source with energy spectrum.

2020 ◽  
Vol 38 ◽  
pp. 93-99
Author(s):  
Hiroshi Sakurai ◽  
Kazushi Hoshi ◽  
Yosuke Harasawa ◽  
Daiki Ono ◽  
Kun Zhang ◽  
...  

We developed the photon counting CT system by using a conventional laboratory X-ray source and a CdTe line sensor. Attenuation coefficients were obtained from the measured CT image data. Our suggested method for deriving the electron density and effective atomic number from the measured attenuation coefficients was tested experimentally. The accuracy of the electron densities and effective atomic numbers are about <5 % (the averages of absolute values are 2.6 % and 3.1 %, respectively) for material of 6< Z and Zeff <13. Our suggested simple method, in which we do not need the exact source X-ray spectrum and detector response function, achieves comparable accuracy to the previous reports.


2010 ◽  
Author(s):  
Yukino Imura ◽  
Hisashi Morii ◽  
Akifumi Koike ◽  
Takaharu Okunoyama ◽  
Yoichiro Neo ◽  
...  

2020 ◽  
Vol 95 (8) ◽  
pp. 085301 ◽  
Author(s):  
Zainab Alsayed ◽  
Mohamed. S. Badawi ◽  
Ramadan Awad ◽  
Ahmed. M. El-Khatib ◽  
Abouzeid. A. Thabet

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Akio Yoneyama ◽  
Masahide Kawamoto ◽  
Rika Baba

AbstractElemental kinds, composition ratios, effective atomic number (Zeff), and spatial distributions are the most basic information on materials and determine the physical and chemical properties of materials. X-ray fluorescence analysis have conventionally been used for elemental mapping, however maps on deep internal areas cannot be obtained because the escape depth of fluorescence X-rays is limited to a few mm from the surface of samples. Herein, we present a novel Zeff imaging method that uses back-scattered X-rays. The intensity ratio of elastic and inelastic back-scattered X-rays depends on the atomic number (Z) of a single-element sample (Zeff for a plural-element sample), and so Zeff maps in deep areas can be obtained by spectrum analysis of the scattered high-energy incident X-rays. We demonstrated the feasibility of observing a phantom covered by an aluminum plate by using synchrotron radiation X-ray. A fine Zeff map that can be used to identify materials was obtained from only front-side observation. The novel method opens up a new way for Zeff mapping of deep areas of thick samples from front-side observation.


2018 ◽  
Vol 25 (6) ◽  
pp. 1797-1802 ◽  
Author(s):  
Zhijun Chi ◽  
Yingchao Du ◽  
Lixin Yan ◽  
Dong Wang ◽  
Hongze Zhang ◽  
...  

Unlike large-scale and expensive synchrotron radiation facilities, the Thomson scattering X-ray source can provide quasi-monochromatic, energy-tunable and high-brightness X-ray pulses with a small footprint and moderate cost, making it an excellent candidate for dual-energy and multi-energy imaging at laboratories and hospitals. Here, the first feasibility study on dual-energy computed tomography (CT) based on this type of light source is reported, and the effective atomic number and electron-density distribution of a standard phantom consisting of polytetrafluoroethylene, water and aluminium is derived. The experiment was carried out at the Tsinghua Thomson scattering X-ray source with peak energies of 29 keV and 68 keV. Both the reconstructed effective atomic numbers and the retrieved electron densities of the three materials were compared with their theoretical values. It was found that these values were in agreement by 0.68% and 2.60% on average for effective atomic number and electron density, respectively. These results have verified the feasibility of dual-energy CT based on the Thomson scattering X-ray source and will further expand the scope of X-ray imaging using this type of light source.


2008 ◽  
Vol 47 (9) ◽  
pp. 7317-7323 ◽  
Author(s):  
Wenjuan Zou ◽  
Takuya Nakashima ◽  
Yoshiaki Onishi ◽  
Akifumi Koike ◽  
Bunji Shinomiya ◽  
...  

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