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Numerical Validation of A Simple Dynamic Beam Filtration Strategy in Cone Beam CT

集成技术 2025年第2期14卷 71-85页

作者： WANG Heran XIE Jixiong ZHU Jiongtao ZHANG Xin TAN Yuhang SU Ting GE Yongshuai Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Research Center for Advanced Detection Materials and Medical Imaging Devices Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Paul C.Lauterbur Research Center for Biomedical Imaging Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of SciencesShenzhen 518055China

For cone beam computed tomography(CBCT),there has long been a desire to modulate the intensity and distribution of the X-rays to accommodate the patient’s anatomy as the gantry rotates from one projection to *** would reduce both image artifacts and radiation ***,the current beam modulation setups,such as dynamic bowtie filters,may be too complex for practical use in clinical *** study aimed to investigate a simplified dynamic beam filtration strategy for CBCT imaging to reduce image artifacts and radiation *** this study,the beam filtration was designed to vary dynamically as the CBCT gantry rotates around the ***,two distinct components were integrated:the sheet filter part and the bowtie filter *** dynamic beam filtration setup has two working schemes,one is a combination of dynamic sheet filter and dynamic bowtie filter,denoted as dynamic filterdynamic bowtie(DFDB);the other is a combination of dynamic sheet filter and static bowtie filter,denoted as dynamic filter-static bowtie(DFSB).Numerical imaging experiments were performed for three human body parts:the shoulder,chest,and *** addition,the Monte Carlo simulation platform MC-GPU was used to generate the dose distribution *** showed that the proposed DFDB and DFSB beam filtration schemes can significantly reduce the image artifacts and thus improve the CBCT image *** on the scanned object,the total radiation dose could be reduced by 30%.The proposed simple dynamic beam filtration strategy,especially the DFSB approach,could be beneficial in the future to improve the CBCT image quality with reduced image artifacts and radiation dose.

关键词： dynamic filtration radiation dose reduction artifacts reduction cone beam computed tomography

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Ultrabroadband mid-infrared emission from Cr^(2+):ZnSe-doped chalcogenide glasses prepared via hot uniaxial pressing and melt-quenching

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Chinese Physics B 2021年第9期30卷 259-266页

作者： Ke-Lun Xia Guang Jia Hao-Tian Gan Yi-Ming Gui Xu-Sheng Zhang Zi-Jun Liu Xiang Shen Ningbo Institute of Oceanography Ningbo 315832China Laboratory of Infrared Materials and Devices Advanced Technology Research InstituteNingbo UniversityNingbo 315211China Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo 315211China

We reported an ultrabroadband mid-infrared(MIR)emission in the range of 1800 nm-3100 nm at room temperature(RT)from a Cr^(2+):ZnSe-doped chalcogenide glasses(ChGs)and studied the emission-dependent properties on the doping methods.A series of Cr^(2+):ZnSe/As_(40)S_(57)Se_(3)(in unit wt.%)glass-ceramics were prepared by hot uniaxial pressing(HUP)and melt-quenching methods,*** glass-ceramics with MIR emission bands greater than 1000 nm were successfully prepared by both *** effects of matrix glass composition and grain doping concentration on the optical properties of the samples were *** occurrence state,morphology of the grains,and the microscopic elemental distributions were characterized using x-ray diffraction(XRD),scanning electron microscope(SEM),and energy dispersive spectrometer(EDS)analyses.

关键词： mid-infrared emission glass-ceramics hot uniaxial pressing melt-quenching

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Atmospheric Pollution Monitoring Based on Fourier Transform infrared Spectrometer 2

Atmospheric Pollution Monitoring Based on Fourier Transform ...

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2nd International Conference on Optical imaging and Measurement, ICOIM 2023

作者： Sun, Jun Xu, Zhijing Lin, Yinghui Chen, Ren Wang, Zhanhu Shanghai Maritime University College of Information Engineering Shanghai China Shanghai Institute of Technical Physics State Key Laboratory of Infrared Physics Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9798350358636

Air pollution has serious impacts on human health and the environment, thus accurate monitoring and analysis of air pollutants is of vital importance. As an efficient monitoring technology, the Fourier Transform infrared Spectrometer has played a wide role in the study of air pollution. This paper elaborates on the basic principles and working mechanisms of the Fourier Transform infrared Spectrometer and discusses the important role in air pollution monitoring, also analyzes the development trend of the Fourier Transform infrared Spectrometer in air monitoring. © 2023 IEEE.

关键词： Air pollution

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Introduction of high-speed data acquisition system scheme based on FPGA 3

Introduction of high-speed data acquisition system scheme ba...

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3rd International Conference on Electronic Information Engineering and Data Processing, EIEDP 2024

作者： Lin, Yinghui Xu, Zhijing Sun, Jun Chen, Ren College of Information Engineering Shanghai Maritime University Shanghai China Shanghai Institute of Technical Physics State Key Laboratory of Infrared Physics Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9781510680531

Signal acquisition system is widely used in various fields of reality, due to the data acquisition rate and processor performance enhancement as well as the development of sensor arrays and other technologies, the data acquisition system acquisition and transmission of the signal is exponential growth, in order to solve the high-speed signal acquisition process of the large amount of data, real-time, transmission rate and other issues, the study of high-speed acquisition of signals as well as the transmission program has an important practical significance. FPGA is very suitable to be applied in high-speed signal acquisition system because of its characteristics. In this paper, we firstly introduce the composition of a typical high-speed signal acquisition system based on FPGA, and then briefly introduce the function and development process of each module of the system and introduce the mainstream programs used in several key modules. In engineering applications, different programs should be used in different modules in conjunction with the actual. © 2024 SPIE.

关键词： Field programmable gate arrays (FPGA)

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A Wavelet-CNN-LSTM framework for edge effect suppression in ultra-precision optical surface polishing

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Optics & Laser technology 2025年 190卷

作者： Ke Chen Bo Xiao XueLian Liu LinZhe Deng ChunYang Wang Xi’an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi’an Technological University Xi’an 710021 China School of Optoelectronic Engineering Xian. Technological University Xi’an 710021 China

In the manufacturing of ultra precision optical components, edge effect is an inevitable phenomenon that greatly affects the surface quality of optical components, especially in the manufacturing of medium and large aperture optical components. Although various extension methods have been used to suppress edge effects, they are difficult to adapt to different surface features, and the improvement in residual surface shape accuracy is not significant. To address this challenge, this paper proposes a hybrid deep learning model integrating Wavelet Transform, Convolutional Neural Network, and Long Short-Term Memory Network for adaptive optical surface profile extension. The proposed model was trained and evaluated on three representative optical components, achieving a mean absolute error (MAE) of 2.02 and a Coefficient of determination (R 2 ) of 0.796, demonstrating its effectiveness in surface profile prediction. When applied to the extension of fused silica surface profiles, the method achieved an average polishing quality improvement of approximately 90%, significantly outperforming traditional extension techniques. Notably, the predicted extended surface exhibited seamless continuity with the original profile, ensuring a smooth and precise surface transition. These results confirm that the proposed Wavelet-CNN-LSTM model provides a robust and adaptive solution for edge effect suppression and high-precision optical component.

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A method for measuring object distance on the plane based on monocular vision

A method for measuring object distance on the plane based on...

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Chinese Society for Optical Engineering Conferences, CSOE 2016

作者： Zhang, Qian Zhou, Pucheng Xue, Mogen Anhui Province Key Laboratory of Polarized Imaging Detection Technology Hefei China

ISBN: (纸本)9781510610118

Plane measurement is an important task in image processing and computer vision. In this paper, we present a kind of plane measurement method for monocular vision, which calculates the image magnification by controlling the camera movement, the height of object and camera focal length. We can finally get the measurement results. Experimental results show that the proposed method can measure the distance more accurately. What's more, it has the advantages of high universality, simple steps and small error. © 2017 SPIE.

关键词： Cameras

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Research on polarization imaging information parsing method 3

Research on polarization imaging information parsing method

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3rd International Symposium on Monitoring, Early Warning, Removal technology of Space Targets and Debris, the 4th International Conference on Frontiers in Optical imaging technology and Applications, and the 2nd International Symposium on Photoelectric Defense Technologies

作者： Yuan, Hongwu Zhou, Pucheng Wang, Xiaolong Key Laboratory of Polarization Imaging Detection Technology in Anhui Province Hefei China

ISBN: (数字)9781510607286

ISBN: (纸本)9781510607279

Polarization information parsing plays an important role in polarization imaging detection. This paper focus on the polarization information parsing method: Firstly, the general process of polarization information parsing is given, mainly including polarization image preprocessing, multiple polarization parameters calculation, polarization image fusion and polarization image tracking, etc.;And then the research achievements of the polarization information parsing method are presented, in terms of polarization image preprocessing, the polarization image registration method based on the maximum mutual information is designed. The experiment shows that this method can improve the precision of registration and be satisfied the need of polarization information parsing;In terms of multiple polarization parameters calculation, based on the omnidirectional polarization inversion model is built, a variety of polarization parameter images are obtained and the precision of inversion is to be improve obviously;In terms of polarization image fusion, using fuzzy integral and sparse representation, the multiple polarization parameters adaptive optimal fusion method is given, and the targets detection in complex scene is completed by using the clustering image segmentation algorithm based on fractal characters;In polarization image tracking, the average displacement polarization image characteristics of auxiliary particle filtering fusion tracking algorithm is put forward to achieve the smooth tracking of moving targets. Finally, the polarization information parsing method is applied to the polarization imaging detection of typical targets such as the camouflage target, the fog and latent fingerprints. © 2016 SPIE.

关键词： Image registration

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Optical processing strategies for micro-imaging small-aperture Wolter mirrors 7

Optical processing strategies for micro-imaging small-apertu...

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7th Global Intelligent Industry Conference, GIIC 2024

作者： Li, Yaran State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

ISBN: (纸本)9781510682986

The Wolter microscope, characterized by its high spatial resolution, large geometric solid angle, and broadband achromatic correction, serves as an ideal initial configuration for the next generation of X-ray imaging diagnostic techniques. Nevertheless, the development of small-aperture Wolter mirrors encounters significant challenges, which primarily hinder their widespread application. This article presents a design approach for micro-imaging small-aperture Wolter microscopes, considering both optical design principles and mirror preparation techniques. It reveals the intricate trade-off relationships among spatial resolution, collection efficiency, and the feasibility of optical processing. By effectively integrating optical principles with manufacturing practices, a staged development roadmap for small-aperture Wolter mirrors is proposed. Through technological convergence, the electroforming nickel preparation process can be gradually mastered. This article provides technical insights that can guide the design and development of high-quality hard X-ray Wolter microscopes. © 2024 SPIE.

关键词： Mirrors

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Thermal stability of magnetron sputtering Ge-Ga-S films

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Chinese Physics B 2020年第8期29卷 485-488页

作者： Lei Niu Yimin Chen Xiang Shen Tiefeng Xu Laboratory of Infrared Materials and Devices&Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Research Institute of Advanced TechnologyNingbo UniversityNingbo 315211China Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

Ge-Ga-S thin films were deposited by magnetron sputtering with mean coordination number(MCN)ranging from 2.46 to *** physical properties of the Ge-Ga-S films,including optical band gap,refractive index,and thickness,vary with the time of heat *** on the analysis of the topology model,it is concluded that the Ge-Ga-S thin films with components close to the stoichiometric ratio can form the most Ga-S bonds and Ga-S bonds,and the physical properties of the Ge27.3Ga6.3S66.3(MCN=2.62)film are the most *** is an important reference for thin film photonic devices.

关键词： chalcogenide thin films refractive index optical band gap thermal stability

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Research on Polarization imaging detection and Tracking Method of low-speed and small UAV Targets 8

Research on Polarization Imaging Detection and Tracking Meth...

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8th Symposium on Novel Photoelectronic detection technology and Applications

作者： Huang, Qinchao Ren, Shuaijun Zhu, Hong Wu, Lingxia Yang, Fan Anhui Key Laboratory of Polarized Light Imaging Detection Technology Hefei230031 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Aiming at the problem of the low contrast between target and background in the detected UAV target intensity images, a low-speed and small UAV targets detection and tracking method based on polarization imaging detection is proposed. Based on the analysis of the polarization imaging characteristics of low-speed and small UAV targets, through polarization image analysis, single-frame detection based on spatial filtering and adaptive threshold segmentation, continuous frame target trajectory association based on spatiotemporal information, and improved KCF algorithm Target tracking and other processing processes have realized the effective detection and tracking of low-speed and small UAV targets. © 2022 SPIE

关键词： Unmanned aerial vehicles (UAV)

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