Dr. Huiqiang Liu Profile

Dr. Huiqiang Liu

at Xinjiang Medical Univ

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Publications (2)

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Proceedings Article | 7 November 2018 Paper

Bone organ printing based on surface structure light projection 3D contour measurement

Kun Wang, Ze-Ming Luan, Li-Xia Zhang, Ou Li, A Le-Sheng Jiang A Bie Ke, Xue-Liang Zhang, Shun-Hua Wu, Hui-Qiang Liu

Proceedings Volume 10832, 108320R (2018) https://doi.org/10.1117/12.2507201

KEYWORDS: 3D printing, Bone, 3D metrology, Fourier transforms

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Objective: Utilizing the advantages of non-contact , rapid and flexible three-dimensional contour measurement by surface structure light projection, we can solve the problems of difficult, time-consuming and low precision of three-dimensional surface data in the fields such as bone replacement, tooth embryo planting, orthopedic organs and surgical simulation in the current clinical medicine. Methods: Collect the deformation fringes generated by the light projection of the surface structure generated by the digital grating onto the surface of the measured object, and use the Fast Fourier Transform (FFT), spatial filtering, inverse Fourier transform (IFFT) and phase unwrapping techniques to demodulate the three-dimensionality of the measured object. Results: The structure of the light path is simple and easy. Only by acquiring a deformed fringe pattern of an actual object, the three-dimensional contour surface structure and feature shape of the measured object can be quickly and effectively obtained. Conclusion: This technical method has important clinical value and wide application potential in the rapid acquisition of bone organ three-dimensional surface data.

Proceedings Article | 8 March 2017 Paper

A comparative study of x-ray phase micro-tomography: grating based technique vs. high-energy propagation based technique

Huiqiang Liu, Xizeng Wu, Tiqiao Xiao

Proceedings Volume 10255, 102551N (2017) https://doi.org/10.1117/12.2268388

KEYWORDS: Fetus, X-rays, Phase retrieval, Spatial resolution, Tissues, Biomedical optics, Tomography, X-ray imaging, Brain, Phase contrast

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Among the X-ray phase contrast imaging (XPCI) techniques, both propagation-based and grating-based micro-tomography recently dominate the non-destructive three-dimensional inner-structure measurement in biomedical research, especially for visualizing tiny density variations in soft tissues and organs. In order to quantitatively evaluate the advantages and disadvantages of both techniques for comprehensive application through carrying out a comparison study of high energy propagation-based micro-tomography with generalized phase-and-attenuation duality (PAD) phase retrieval and Talbot grating interferometer-based micro-tomography, implemented with two biomedical specimens, mouse fetus and rat brain, on the basis of synchrotron radiation facility. We find that the grating-based micro-tomography is superior in the contrast-to-noise ratio (CNR) or the mass density resolution, and inferior in the spatial resolution (SR), compared with that of propagation-based micro-tomography. We found that for achieving a given CNR, the grating-based micro-tomography applies about 1.5 times radiation dose involved as compared to the propagation-based micro-tomography with PAD phase retrieval. Additionally, the complex coherent degrees of light source related to the both techniques were duly taken into account in the analysis of their SR comparison. Finally, the mass density distribution of soft biomedical specimens can be estimated using our presented method preliminarily. Our work gives indications for applications and developments of phase sensitive micro-tomography for soft biomedical specimens and low-Z materials.

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