Measurement of electron density and effective atomic number using dual-energy x-ray CT

2005 ◽  
Author(s):  
T. Tsunoo ◽  
M. Torikoshi ◽  
Y. Ohno ◽  
M. Endo ◽  
M. Natsuhori ◽  
...  
Keyword(s):  
Electron Density ◽  
Atomic Number ◽  
Effective Atomic Number ◽  
Dual Energy ◽  
X Ray

Experimental feasibility of dual-energy computed tomography based on the Thomson scattering X-ray source

2018 ◽  
Vol 25 (6) ◽  
pp. 1797-1802 ◽  
Author(s):  
Zhijun Chi ◽  
Yingchao Du ◽  
Lixin Yan ◽  
Dong Wang ◽  
Hongze Zhang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Electron Density ◽  
Light Source ◽  
Atomic Number ◽  
Effective Atomic Number ◽  
Thomson Scattering ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
X Ray ◽  
Dual Energy Computed Tomography

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.

A Spectrum-Adaptive Decomposition Method for Effective Atomic Number Estimation Using Dual Energy CT

2020 ◽  
Vol 2020 (14) ◽  
pp. 293-1-293-7
Author(s):  
Ankit Manerikar ◽  
Fangda Li ◽  
Avinash C. Kak
Keyword(s):  
Atomic Number ◽  
Decomposition Method ◽  
Traditional Approach ◽  
Effective Atomic Number ◽  
Dual Energy ◽  
Performance Comparison ◽  
Estimation Methods ◽  
Dual Energy Ct ◽  
Projection Data ◽  
X Ray

Dual Energy Computed Tomography (DECT) is expected to become a significant tool for voxel-based detection of hazardous materials in airport baggage screening. The traditional approach to DECT imaging involves collecting the projection data using two different X-ray spectra and then decomposing the data thus collected into line integrals of two independent characterizations of the material properties. Typically, one of these characterizations involves the effective atomic number (Zeff) of the materials. However, with the X-ray spectral energies typically used for DECT imaging, the current best-practice approaches for dualenergy decomposition yield Zeff values whose accuracy range is limited to only a subset of the periodic-table elements, more specifically to (Z < 30). Although this estimation can be improved by using a system-independent ρe — Ze (SIRZ) space, the SIRZ transformation does not efficiently model the polychromatic nature of the X-ray spectra typically used in physical CT scanners. In this paper, we present a new decomposition method, AdaSIRZ, that corrects this shortcoming by adapting the SIRZ decomposition to the entire spectrum of an X-ray source. The method reformulates the X-ray attenuation equations as direct functions of (ρe, Ze) and solves for the coefficients using bounded nonlinear least-squares optimization. Performance comparison of AdaSIRZ with other Zeff estimation methods on different sets of real DECT images shows that AdaSIRZ provides a higher output accuracy for Zeff image reconstructions for a wider range of object materials.

Electron Density and Effective Atomic Number Measurement by Using a Newly Developing Photon Counting CT System

2020 ◽  
Vol 38 ◽  
pp. 93-99
Author(s):  
Hiroshi Sakurai ◽  
Kazushi Hoshi ◽  
Yosuke Harasawa ◽  
Daiki Ono ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Electron Density ◽  
Atomic Number ◽  
Photon Counting ◽  
Effective Atomic Number ◽  
Image Data ◽  
Detector Response ◽  
Simple Method ◽  
Attenuation Coefficients ◽  
X Ray ◽  
Ct System

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.

scholarly journals Effective atomic number and electron density calibration with a dual-energy CT technique

2016 ◽  
Author(s):  
Christian David Trujillo-Bastidas ◽  
Olivia Amanda García-Garduño ◽  
José Manuel Lárraga-Gutiérrez ◽  
Arnulfo Martínez-Dávalos ◽  
Mercedes Rodríguez-Villafuerte
Keyword(s):  
Electron Density ◽  
Atomic Number ◽  
Effective Atomic Number ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Technique

Reply to Comment on ‘A new method to measure electron density and effective atomic number using dual-energy CT images’

2016 ◽  
Vol 61 (16) ◽  
pp. 6266-6268
Author(s):  
Luis Isaac Ramos-Garcia ◽  
José Fernando Pérez-Azorin ◽  
Julio F Almansa
Keyword(s):  
Electron Density ◽  
Atomic Number ◽  
Effective Atomic Number ◽  
Ct Images ◽  
Dual Energy ◽  
New Method ◽  
Dual Energy Ct

A new method to measure electron density and effective atomic number using dual-energy CT images

2015 ◽  
Vol 61 (1) ◽  
pp. 265-279 ◽  
Author(s):  
Luis Isaac Ramos Garcia ◽  
José Fernando Pérez Azorin ◽  
Julio F Almansa
Keyword(s):  
Electron Density ◽  
Atomic Number ◽  
Effective Atomic Number ◽  
Ct Images ◽  
Dual Energy ◽  
New Method ◽  
Dual Energy Ct

Simultaneous characterization of electron density and effective atomic number for radiotherapy planning using stoichiometric calibration method and dual energy algorithms

2018 ◽  
Vol 41 (3) ◽  
pp. 601-619 ◽  
Author(s):  
Mohammad J. Tahmasebi Birgani ◽  
Maziyar Mahdavi ◽  
Mansour Zabihzadeh ◽  
Mehrzad Lotfi ◽  
Mohammad A. Mosleh-Shirazi
Keyword(s):  
Electron Density ◽  
Atomic Number ◽  
Effective Atomic Number ◽  
Calibration Method ◽  
Dual Energy ◽  
Radiotherapy Planning
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