Mr. Zhao Wang Profile

Zhao Wang

at Beijing Normal Univ

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Publications (2)

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Proceedings Article | 18 March 2021 Paper

Nondestructive investigation on elemental distributions of oil painting using 3D micro-XRF spectroscopy

Kai Pan, Shuang Zhang, Zhao Wang, Zhuxuan Duo, Zelin Du, Zhiguo Liu, Tianxi Sun

Proceedings Volume 11780, 117800G (2021) https://doi.org/10.1117/12.2589073

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Confocal 3D Micro-XRF is a well established and none-destructive analytical method which has a wide range of fields for applications such as environmental science, archaeology, material science and so on. This kind of technique showed dramatic results in 3D image reconstruction, surface morphology and elemental depth sensitive profiles. Therefore, 3D Micro-XRF analysis method based on a confocal X-ray set-up is very suitable for evaluation and illustration with depth sensitive investigation of oil paintings. It is meaningful to characterize the surface elemental distribution in different layer depth by surface scanning. In this work, a 3D Micro-XRF experimental set-up is established based on a Mo target X-ray source. The operated voltage is 20kV and the currents is 0.5mA. The core optical components, two polycapillary X-ray lenses were designed and manufactured by the Key Laboratory of Beam Technology of the Ministry of Education, Beijing Normal University. The FWHMs of the confocal volume is 33.0 μm , 32.4 Μm and 35 μm in three dimensions, respectively. With a proposed progressive approximation method, a modern oil painting segament was anlysed using 3D Micro-XRF spectroscopy. The surface elemental distributions were mapped through surface scanning in different motor steps. This investigation can be referred for furture works that attempt to answer for questions on painting techniques, pigmant palette, production process, counterfeit identification and so on.

Proceedings Article | 5 November 2020 Paper

Poly-capillary x-ray collimating lens composed with channels of different diameters for medical imaging

Kai Pan, Shuang Zhang, Zhao Wang, Zhuxuan Duo, Changqi Liu, Zhiguo Liu, Tianxi Sun

Proceedings Volume 11565, 115650A (2020) https://doi.org/10.1117/12.2580126

KEYWORDS: X-rays, X-ray imaging, Medical imaging, Imaging systems, Optical components, Manufacturing, Modulation transfer functions, Capillaries, Image quality

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Poly-capillary X-ray lens provided a special mechanism to control X-ray radiation. In recent reported works, polycapillary X-ray lens started to be applied in medical imaging fields. The use of poly-capillary X-ray lens in medical imaging systems brought proper benefits in Compton scattering rejection and resolution enhancement. However, the Xray intensity distribution of the output has unsatisfied uniformity when using conventional poly-capillary lens if the primary rays emitted by a common X-ray tube. Uneven intensity distribution will cause problems such as details loss and longer exposure time for better reconstruction results. In this work, a new type of poly-capillary X-ray collimating lens was introduced for medical imaging. Different from the conventional ones, this kind of lens was divided into three regions and subarray units of different diameter channels were placed in their corresponding regions. A program was written based on ray-tracing method for optical design and imaging simulation. The optical properties of this new type collimating lens were tested, using a 50.0μm Cu target X-ray tube with 20.0kV voltage and 0.2mA currents. A plateau region that had good uniformity which is 4.0mm in diameter was obtained. In addition, X-ray transmission imaging experiments for small samples showed improvements in imaging qualities using this new optical component. Although the existence of manufacturing difficulties effects the finished product quality, this new kind of X-ray poly-capillary lens shows its potential in medical imaging.

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