Prof. Li Zhang Profile

Prof. Li Zhang

at Tsinghua Univ

SPIE Involvement:

Author

Publications (40)

Proceedings Article | 1 April 2024 Presentation + Paper

Motion-compensated 4DCT reconstruction from single-beat cardiac CT scans using convolutional networks

Zhenyao Yan, Zhennong Chen, Li Zhang, Quanzheng Li, Dufan Wu

Proceedings Volume 12925, 129251D (2024) https://doi.org/10.1117/12.3005368

KEYWORDS: Medical image reconstruction, Education and training, Reconstruction algorithms, Image restoration, CT reconstruction, Deformation, Computed tomography, 3D projection, Temporal resolution, Image registration

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Proceedings Article | 1 April 2024 Presentation + Paper

An alternative Bayesian reconstruction of sparse-view CT by optimizing deep learning parameters

Changyu Chen, Zhiqiang Chen, Li Zhang, Yuxiang Xing

Proceedings Volume 12925, 1292518 (2024) https://doi.org/10.1117/12.3008509

KEYWORDS: Image restoration, Image quality, Deep learning, Computed tomography, Anatomy, Data modeling, CT reconstruction, Image enhancement

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Proceedings Article | 7 April 2023 Poster + Paper

An edge-preserving mean curvature regularization for CT reconstruction

Le Shen, Yuxiang Xing, Li Zhang, Sen Wang

Proceedings Volume 12463, 1246346 (2023) https://doi.org/10.1117/12.2655207

KEYWORDS: CT reconstruction, Reconstruction algorithms, Diffusion, Image quality, Computed tomography

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Proceedings Article | 7 April 2023 Presentation

Fast kV-switching and dual-layer flat panel detector enabled CBCT joint spectral imaging

Hao Zhou, Li Zhang, Hewei Gao

Proceedings Volume 12463, 1246316 (2023) https://doi.org/10.1117/12.2652231

KEYWORDS: Imaging spectroscopy, Sensors, Iodine, Lead, Imaging systems, Image sensors

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Proceedings Article | 7 April 2023 Poster

Comparison of two simulation methods in x-ray-grating-based dark-field imaging for lung tissues

Peiyuan Guo, Li Zhang, Hewei Gao, Yuxiang Xing, Zhentian Wang, Zhiqiang Chen

Proceedings Volume 12463, 124634Y (2023) https://doi.org/10.1117/12.2651557

KEYWORDS: Lung, Tissues, X-rays, X-ray imaging, Diffusion, Visibility, Imaging systems, Wavefronts, Wave propagation, Projection systems

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Proceedings Article | 18 October 2022 Open Access

An analytical Prj2CR covariance estimation method for iterative CT reconstruction algorithms

Xiaoyue Guo, Li Zhang, Yuxiang Xing

Proceedings Volume 12304, 123041J (2022) https://doi.org/10.1117/12.2647146

KEYWORDS: Signal to noise ratio, Statistical analysis, Image analysis, CT reconstruction, Image quality

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Image mean and covariance required for a model observer are usually calculated by the statistical method using image samples, which is hard to acquire in reality. Although some analytical methods are proposed to estimate image covariance from a single projection, these methods are of high computational cost for large-dimensional images (e.g., 512×512), and images of large dimension are commonly required. Considering the covariance used for a model observer is the covariance of the channel response, whose dimension is much smaller than the image covariance, we aim to obtain the covariance of small-dimensional channel response directly from its projection. Channel filters are applied to the analytical projection to image (Prj2Img) covariance estimation method to derive the analytical projection to channel response (Prj2CR) covariance estimation method, which successfully reduces the computational cost and connects the covariance of projection and channel response. In addition, a transition matrix is introduced in Prj2CR method to stabilize the connections. The transition matrix mainly depends on channel filters, not the system, phantom, and reconstruction algorithm, which means it can be calibrated by small-dimensional reconstructions and then applied to any situation with a same channel filter. We validate the feasibility and utility of the proposed Prj2CR method by simulations. 128×128 reconstructions from qGGMRF-WLS are adopted for calibration, while 512×512 reconstructions are used for validation. SNR of CHO is chosen as the figure of merit for performance evaluation, and the covariance estimated by 290 image samples are used as the reference. Results show that the SNR by the Prj2CR method is within 95% confidence interval of the SNR* by 290 image samples, indicating that the proposed method accords with statistical method. The Prj2CR method may be beneficial for subjective image quality assessment since it only needs a single sample of projection and has low computational cost.

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Proceedings Article | 15 February 2021 Presentation + Paper

Training a low-dose CT denoising network with only low-dose CT dataset: comparison of DDLN and Noise2Void

Kaichao Liang, Li Zhang, Yuxiang Xing

Proceedings Volume 11595, 115950I (2021) https://doi.org/10.1117/12.2581922

KEYWORDS: Denoising, X-rays, Visualization, Statistical analysis, Machine learning, Image visualization, Computed tomography

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Progressive medical image annotation with convolutional neural network-based interactive segmentation method

Yunkun Bai, Guangmin Sun, Yu Li, Le Shen, Li Zhang

Proceedings Volume 11596, 115962Q (2021) https://doi.org/10.1117/12.2582241

KEYWORDS: Image segmentation, Medical imaging, Data modeling, Convolutional neural networks, Image processing algorithms and systems, Human-computer interaction, Evolutionary algorithms, Data integration, Computer simulations, Cancer

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

3D image reconstruction for symmetric-geometry CT with linearly distributed source and detector in a stationary configuration

Tao Zhang, Hewei Gao, Li Zhang, Yuxiang Xing, Zhiqiang Chen

Proceedings Volume 11595, 115953S (2021) https://doi.org/10.1117/12.2581070

KEYWORDS: Sensors, Computed tomography, 3D image processing, Image restoration, Tomography, Reconstruction algorithms, X-ray sources, X-ray computed tomography, Temporal resolution, Manufacturing

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Proceedings Article | 16 March 2020 Presentation + Paper

A deep learning reconstruction method for sparsely spaced multidetector helical CT using cascaded dual-domain CNN

Ao Zheng, Hewei Gao, Li Zhang, Yuxiang Xing

Proceedings Volume 11312, 1131208 (2020) https://doi.org/10.1117/12.2548774

KEYWORDS: Sensors, Image quality, Computed tomography, Lung, Fluctuations and noise, Reconstruction algorithms, Network architectures, Photons

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Proceedings Article | 16 March 2020 Presentation + Paper

A preclinical large-field-of-view x-ray multi-contrast lung imaging prototype

Xinbin Li, Zhiqiang Chen, Li Zhang, Hewei Gao, Chengpeng Wu, Xiaohua Zhu

Proceedings Volume 11312, 113121A (2020) https://doi.org/10.1117/12.2549560

KEYWORDS: X-rays, Imaging systems, Prototyping, X-ray imaging, Absorption, Lung, X-ray detectors, Lung imaging, Phase contrast

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Proceedings Article | 31 July 2019 Paper

Second glance framework (secG): enhanced ulcer detection with deep learning on a large wireless capsule endoscopy dataset

Sen Wang, Yuxiang Xing, Li Zhang, Hewei Gao, Hao Zhang

Proceedings Volume 11198, 111980V (2019) https://doi.org/10.1117/12.2540456

KEYWORDS: Endoscopy, Machine learning, Computer aided diagnosis and therapy, Image classification, Machine vision

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Proceedings Article | 28 May 2019 Paper

Information retrieval in x-ray imaging with grating interferometry using convolution neural network

Chengpeng Wu, Yuxiang Xing, Hewei Gao, Li Zhang, Xinbin Li, Shengping Wang, Weijun Peng

Proceedings Volume 11072, 1107231 (2019) https://doi.org/10.1117/12.2534270

KEYWORDS: Convolution, Neural networks, X-ray imaging, Interferometry, Phase contrast, X-rays, Deconvolution, Breast, Image retrieval

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Proceedings Article | 28 May 2019 Paper

Inverse-geometry CT with linearly distributed source and detector: stationary configuration and direct filtered-backprojection reconstruction

Tao Zhang, Yuxiang Xing, Hewei Gao, Zhiqiang Chen, Li Zhang

Proceedings Volume 11072, 110722T (2019) https://doi.org/10.1117/12.2534817

KEYWORDS: Sensors, Reconstruction algorithms, X-ray computed tomography, Detection and tracking algorithms, Detector arrays, Linear filtering, Computed tomography, Algorithm development, Imaging systems, Head

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Proceedings Article | 1 March 2019 Paper

Dental and maxillofacial cone beam computed tomography absorbed dose distribution calculation by GEANT4

Shumei Jia, Hewei Gao, Li Zhang, YuXiang Xing, JunZheng Zheng

Proceedings Volume 10948, 109483K (2019) https://doi.org/10.1117/12.2512967

KEYWORDS: X-rays, Computed tomography, X-ray computed tomography, X-ray sources, Radiology

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Proceedings Article | 8 March 2017 Paper

Collimators optimization for EDXRD security screening system

Tianyi YangDai, Li Zhang

Proceedings Volume 10255, 102551R (2017) https://doi.org/10.1117/12.2269034

KEYWORDS: Collimators, Spatial resolution, Scattering, Monte Carlo methods, Photons, Sensors, X-ray diffraction, X-rays, Diffraction, Imaging systems

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Proceedings Article | 2 March 2016 Paper

A class-oriented model for hyperspectral image classification through hierarchy-tree-based selection

Zhongqi Tang, Guangyuan Fu, XiaoLin Zhao, Jin Chen, Li Zhang

Proceedings Volume 9901, 990117 (2016) https://doi.org/10.1117/12.2234792

KEYWORDS: Hyperspectral imaging, Image classification, Chromium, Data modeling, Berkelium, Target detection, Electroluminescence, Sensors, Lithium, Remote sensing

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SPIE Journal Paper | 9 January 2015

Removing blur kernel noise via a hybrid ℓp norm

Xin Yu, Shunli Zhang, Xiaolin Zhao, Li Zhang

JEI, Vol. 24, Issue 01, 013011, (January 2015) https://doi.org/10.1117/12.10.1117/1.JEI.24.1.013011

KEYWORDS: Image restoration, Deconvolution, Image analysis, Cameras, Image enhancement, Motion models, Image filtering, 3D modeling, Visualization, Lithium

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Proceedings Article | 9 January 2015 Paper

Research on key technologies of high repetition rate optical frequency comb

Xiang Wang, Li Zhang, Yao Hu

Proceedings Volume 9444, 94440X (2015) https://doi.org/10.1117/12.2074893

KEYWORDS: Fiber lasers, Pulsed laser operation, Optical filters, Laser applications, Calibration, Oscillators, Optical amplifiers, Nonlinear filtering, Astronomy, Femtosecond phenomena

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Proceedings Article | 5 September 2014 Paper

Developments of x-ray grating imaging and trying of multiple information fusion

Yueping Han, Ruihong Li, Li Zhang, Xiaolei Jiang

Proceedings Volume 9209, 92090U (2014) https://doi.org/10.1117/12.2064978

KEYWORDS: X-rays, X-ray imaging, Signal attenuation, Interferometry, Scattering, Absorption, Refraction, X-ray technology, Imaging systems, Information fusion

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Proceedings Article | 17 October 2012 Paper

Multi-scale image fusion for x-ray grating-based mammography

Xiaolei Jiang, Li Zhang, Zhentian Wang, Marco Stampanoni

Proceedings Volume 8506, 850612 (2012) https://doi.org/10.1117/12.929625

KEYWORDS: Image fusion, X-rays, Principal component analysis, Mammography, X-ray imaging, Signal attenuation, Denoising, Spatial frequencies, Phase contrast, Image quality

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Proceedings Article | 17 October 2012 Paper

An iterative reconstruction method for high-pitch helical luggage CT

Hui Xue, Li Zhang, Zhiqiang Chen, Xin Jin

Proceedings Volume 8506, 85061O (2012) https://doi.org/10.1117/12.928950

KEYWORDS: Sensors, X-rays, X-ray computed tomography, X-ray sources, Inspection, Lawrencium, Image resolution, X-ray imaging, Homeland security, Image quality

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Proceedings Article | 17 October 2012 Paper

A geometrical correction method for radioactive intensity image reconstruction in tomographic gamma scanning

Zhe Liu, Li Zhang, Xiaolei Jiang

Proceedings Volume 8506, 85061L (2012) https://doi.org/10.1117/12.928444

KEYWORDS: Sensors, Signal attenuation, Data modeling, Tomography, Solids, Image restoration, Nondestructive evaluation, Computed tomography, Numerical simulations, Collimators

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Proceedings Article | 13 March 2009 Paper

Multiple information tomosynthesis with grating-based phase-contrast imaging

Zhentian Wang, Zhifeng Huang, Yongshun Xiao, Li Zhang, Kejun Kang

Proceedings Volume 7258, 72581N (2009) https://doi.org/10.1117/12.811368

KEYWORDS: Absorption, X-rays, Medical imaging, Hard x-rays, Tissues, Refraction, Mammography, Phase contrast, Image processing, Imaging systems

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Proceedings Article | 18 March 2008 Paper

Accelerate helical cone-beam CT with graphics hardware

Wenyuan Bi, Zhiqiang Chen, Li Zhang, Yuxiang Xing

Proceedings Volume 6913, 69132T (2008) https://doi.org/10.1117/12.770121

KEYWORDS: Reconstruction algorithms, Visualization, X-ray computed tomography, Sensors, Lithium, Convolution, Detection and tracking algorithms, Physics, Volume rendering, 3D image reconstruction

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Proceedings Article | 18 March 2008 Paper

MLSD-OSEM reconstruction algorithm for cosmic ray muon radiography

Yuanyuan Liu, Ziran Zhao, Zhiqiang Chen, Li Zhang, Yuxiang Xing

Proceedings Volume 6913, 691331 (2008) https://doi.org/10.1117/12.769803

KEYWORDS: Reconstruction algorithms, Muons, Scattering, Radiography, Optical spheres, Monte Carlo methods, Atmospheric particles, Numerical simulations, Particles, Expectation maximization algorithms

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Proceedings Article | 18 March 2008 Paper

A study on projection distribution of few-view reconstruction with total variation constraint

Li Zhang, Xinhui Duan, Yuxiang Xing, Zhiqiang Chen, Jianping Cheng

Proceedings Volume 6913, 69132W (2008) https://doi.org/10.1117/12.769779

KEYWORDS: Reconstruction algorithms, Tomography, Fluctuations and noise, Imaging systems, Computed tomography, Image quality, Image processing, Image restoration, Lithium, Physics

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Proceedings Article | 18 March 2008 Paper

PDE regularization for Bayesian reconstruction of emission tomography

Zhentian Wang, Li Zhang, Yuxiang Xing, Ziran Zhao

Proceedings Volume 6913, 69132X (2008) https://doi.org/10.1117/12.769742

KEYWORDS: Image segmentation, Reconstruction algorithms, Tomography, Image processing algorithms and systems, Image processing, Anisotropic diffusion, Denoising, Partial differential equations, Image restoration, Signal attenuation

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SPIE Journal Paper | 1 July 2007

Volumetric imaging from a multisegment straight-line trajectory and a practical reconstruction algorithm

Hewei Gao, Li Zhang, Yuxiang Xing, Zhiqiang Chen, Jian Zhang, Jianping Cheng

OE, Vol. 46, Issue 07, 077004, (July 2007) https://doi.org/10.1117/12.10.1117/1.2756823

KEYWORDS: Reconstruction algorithms, Sensors, Image segmentation, Optical engineering, Inspection, X-ray computed tomography, Scanners, Computed tomography, Imaging systems, Detection and tracking algorithms

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SPIE Journal Paper | 1 May 2007

Direct filtered-backprojection-type reconstruction from a straight-line trajectory

Hewei Gao, Li Zhang, Zhiqiang Chen, Yuxiang Xing, Jianping Cheng, Zhihua Qi

OE, Vol. 46, Issue 05, 057003, (May 2007) https://doi.org/10.1117/12.10.1117/1.2739624

KEYWORDS: Sensors, Reconstruction algorithms, Detection and tracking algorithms, Optical filters, Optical engineering, Computed tomography, Spatial resolution, Image quality, Inspection, Image filtering

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SPIE Journal Paper | 1 January 2007

Low-complexity near-lossless image compression method and its application-specific integrated circuit design for a wireless endoscopy capsule system

Xiaowen Li, Xiang Xie, GuoLin Li, Li Zhang, ZhiHua Wang

JEI, Vol. 16, Issue 01, 013015, (January 2007) https://doi.org/10.1117/12.10.1117/1.2711802

KEYWORDS: Image compression, Clocks, Endoscopy, Image quality, Very large scale integration, Image filtering, Linear filtering, Data processing, Image sensors, Data conversion

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Proceedings Article | 20 March 2006 Paper

An improved denoising algorithm based on multi-scale dyadic wavelet transform

Zhihua Qi, Li Zhang, Yuxiang Xing, Hewei Gao

Proceedings Volume 6144, 61446G (2006) https://doi.org/10.1117/12.653232

KEYWORDS: Wavelets, Denoising, X-ray computed tomography, Computed tomography, Reconstruction algorithms, Wavelet transforms, Electronic filtering, Image filtering, Signal to noise ratio, Linear filtering

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Proceedings Article | 17 March 2006 Paper

Metal artifacts reduction in CT images through Euler’s elastica and curvature based sinogram inpainting

Jianwei Gu, Li Zhang, Guoqiang Yu, Yuxiang Xing, Zhiqiang Chen

Proceedings Volume 6144, 614465 (2006) https://doi.org/10.1117/12.650137

KEYWORDS: Metals, X-ray computed tomography, Lithium, Reconstruction algorithms, X-rays, Numerical simulations, Signal attenuation, X-ray imaging, Image interpolation, Image quality

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Proceedings Article | 2 March 2006 Paper

A backprojection filtered image reconstruction algorithm for circular cone-beam CT

Liang Li, Zhiqiang Chen, Li Zhang, Yuxiang Xing, Kejun Kang

Proceedings Volume 6142, 61424N (2006) https://doi.org/10.1117/12.652520

KEYWORDS: Reconstruction algorithms, Detection and tracking algorithms, Sensors, Image segmentation, Image filtering, X-rays, X-ray computed tomography, X-ray sources, Image processing algorithms and systems, Image restoration

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Proceedings Article | 2 March 2006 Paper

Accelerating 3D cone beam T-FDK algorithm on commodity PC graphics hardware

Zhisheng Dai, Zhiqiang Chen, Yuxiang Xing, Li Zhang

Proceedings Volume 6142, 61424P (2006) https://doi.org/10.1117/12.654121

KEYWORDS: Reconstruction algorithms, Volume rendering, Visualization, Image quality, Detection and tracking algorithms, Sensors, Algorithm development, Data processing, 3D image processing, 3D image reconstruction

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Proceedings Article | 17 February 2006 Paper

Variational segmentation of x-ray image with overlapped objects

Guoqiang Yu, Li Zhang, Jin Zhang, Yuxiang Xing, Hewei Gao

Proceedings Volume 6064, 60640W (2006) https://doi.org/10.1117/12.650449

KEYWORDS: Image segmentation, X-rays, X-ray imaging, Visual process modeling, Image processing, Image processing algorithms and systems, Image filtering, Machine vision, Computer vision technology, Chemical species

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Proceedings Article | 2 February 2006 Paper

Cupping artifacts analysis and correction for a FPD-based cone-beam CT

Li Zhang, Hewei Gao, Shuanglei Li, Zhiqiang Chen, Yuxiang Xing

Proceedings Volume 6065, 60650Z (2006) https://doi.org/10.1117/12.650503

KEYWORDS: X-rays, Sensors, Convolution, Iron, Lead, X-ray detectors, Image quality, X-ray computed tomography, CT reconstruction, X-ray sources

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Proceedings Article | 16 January 2006 Paper

Robust feature extraction for character recognition based on binary images

Lijun Wang, Li Zhang, Yuxiang Xing, Zhiming Wang, Hewei Gao

Proceedings Volume 6067, 606708 (2006) https://doi.org/10.1117/12.650386

KEYWORDS: Detection and tracking algorithms, Feature extraction, Curium, Optical character recognition, Binary data, Image processing, Databases, Neurons, Solids, Optical pattern recognition

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Proceedings Article | 26 October 2004 Paper

Eliminating beam-hardening artifacts in high-energy industrial computed tomography(ICT)

Kejun Kang, Ziran Zhao, Zhiqiang Chen, Li Zhang

Proceedings Volume 5535, (2004) https://doi.org/10.1117/12.559289

KEYWORDS: Scanning tunneling microscopy, Printed circuit board testing, Reconstruction algorithms, X-rays, Signal attenuation, X-ray computed tomography, Monte Carlo methods, Computed tomography, Computer simulations, Algorithm development

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Proceedings Article | 31 July 2002 Paper

One-pixel wide edge detection algorithm based on local accumulative histogram

Hongjun Jia, Li Zhang

Proceedings Volume 4875, (2002) https://doi.org/10.1117/12.477155

KEYWORDS: Edge detection, Image processing, Binary data, Detection and tracking algorithms, Image segmentation, Solids, Inspection, Lithium, Electronics engineering, Image compression

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Showing 5 of 40 publications

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