Study of the Microfocus X-Ray Tube Based on a Point-Like Target Used for Micro-Computed Tomography

Autor: Xiao-Bin Li, Fenglin Liu, Xiao-Jian Zhou, Yufang Cai, Ri-Feng Zhou
Rok vydání: 2016
Předmět:
Photon
Statistical methods
Image Processing
Monte Carlo method
lcsh:Medicine
01 natural sciences
030218 nuclear medicine & medical imaging
law.invention
Diagnostic Radiology
0302 clinical medicine
law
Medicine and Health Sciences
Tube (fluid conveyance)
lcsh:Science
Image resolution
Tomography
Anodes
Multidisciplinary
Radiology and Imaging
Physics
Simulation and Modeling
X-ray tube
Bone Imaging
Physical Sciences
Engineering and Technology
Elementary Particles
Research Article
Materials science
Imaging Techniques
Neuroimaging
Statistics (mathematics)
Electrons
Research and Analysis Methods
03 medical and health sciences
Optics
Diagnostic Medicine
Particle Physics
Electrodes
Photons
business.industry
lcsh:R
010401 analytical chemistry
Biology and Life Sciences
X-Ray Microtomography
0104 chemical sciences
Intensity (physics)
Computed Axial Tomography
X-Ray Radiography
Signal Processing
Cathode ray
Mathematical and statistical techniques
lcsh:Q
Electronics
business
Mathematics
Neuroscience
Zdroj: PLoS ONE
PLoS ONE, Vol 11, Iss 6, p e0156224 (2016)
ISSN: 1932-6203
Popis: For a micro-Computed Tomography (Micro-CT) system, the microfocus X-ray tube is an essential component because the spatial resolution of CT images, in theory, is mainly determined by the size and stability of the X-ray focal spot of the microfocus X-ray tube. However, many factors, including voltage fluctuations, mechanical vibrations, and temperature changes, can cause the size and the stability of the X-ray focal spot to degrade. A new microfocus X-ray tube based on a point-like micro-target in which the X-ray target is irradiated with an unfocused electron beam was investigated. EGS4 Monte Carlo simulation code was employed for the calculation of the X-ray intensity produced from the point-like micro-target and the substrate. The effects of several arrangements of the target material, target and beam size were studied. The simulation results demonstrated that if the intensity of X-rays generated at the point-like target is greater than half of the X-ray intensity produced on the substrate, the X-ray focal spot is determined in part by the point-like target rather than by the electron beam in the conventional X-ray tube. In theory, since it is able to reduce those unfavorable effects such as the electron beam trajectory swinging and the beam size changing for the microfocus X-ray tube, it could alleviate CT image artifacts caused by the X-ray focal spot shift and size change.
Databáze: OpenAIRE
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