Dual phase grating based X-ray differential phase contrast imaging with source grating: theory and validation

Ge, Yongshuai; Chen, Jianwei; Zhu, Ping; Yang, Jun; Deng, Shiwo; Shi, Wei; Zhang, Kai; Guo, Jr-Hung; Zhang, Huitao; Zheng, Hairong; Liang, Dong

doi:10.1364/oe.381759

Cited by 19 publications

(19 citation statements)

References 37 publications

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“…Recently, many novel techniques have been developed with the aim to achieve the socalled single-shot DPC imaging [43][44][45][46] while with maintained image quality. 47,48 Moreover, novel phase grating based interferometers [49][50][51][52] have also been developed to enhance the DPC radiation dose efficiency. Hopefully, the DPCT would become readily available in high resolution biomedical imaging applications in the near future.…”

Section: Discussionmentioning

confidence: 99%

Performance evaluation of dual‐energy CT and differential phase contrast CT in quantitative imaging applications

Zhang

Yang

et al. 2022

Medical Physics

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The purpose of this study is to evaluate and compare the quantitative material decomposition performance of the dual-energy CT (DECT) and differential phase contrast CT (DPCT) via numerical observer studies. Methods: The electron density (𝜌 e ) and the effective atomic number (Z eff ) are selected as the decomposition bases. The image domain based decomposition algorithms with certain noise suppression are used to extract the 𝜌 e and Z eff information under three different spatial resolutions (0.3 mm, 0.1 mm, and 0.03 mm). The contrast-to-noise-ratio (CNR) and the numerical human observer model which is sensitive to the noise textures are investigated to compare the quantitative imaging performance of DECT and DPCT under varied radiation dose levels. Results:The model observer results show that the DECT is superior to DPCT at 0.3 mm spatial resolution (300 mm object size); the DECT and DPCT show similar quantitative imaging performance at 0.1 mm spatial resolution (100 mm object size); and the DPCT outperforms the DECT by approximately 1.5 times for the 0.3 mm sized imaging target at 0.03 mm spatial resolution (30 mm object size). Conclusions: In conclusion, the DECT would be recommended to obtain 𝜌 e and Z eff for the low spatial resolution quantitative imaging applications such as the diagnostic CT imaging. Whereas, the DPCT would be recommended for ultra high spatial resolution imaging tasks of small objects such as the micro-CT imaging. This study provides a reference to determine the most appropriate quantitative X-ray CT imaging method for a certain radiation dose level.

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Section: Discussionmentioning

confidence: 99%

Performance evaluation of dual‐energy CT and differential phase contrast CT in quantitative imaging applications

Zhang

Yang

et al. 2022

Medical Physics

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“…Since the diffraction angle is proportional to the wavelength according to the diffraction equation, the rays with different wavelengths in an incoherent beam are diffracted in different paths; and the diffracted patterns of the rays enable us to analyze the wavelength components of the incoherent beam. These diffraction grating properties apply to recent research to develop spectrometries and X-ray imaging systems [ 23 , 24 , 25 , 26 , 27 , 28 ].…”

Section: Geometries Of Diffraction Grating Imaging Considering Multiple Wavelengthsmentioning

confidence: 99%

Computational Three-Dimensional Imaging System via Diffraction Grating Imaging with Multiple Wavelengths

Jang

Yoo

2021

Sensors

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This paper describes a computational 3-D imaging system based on diffraction grating imaging with laser sources of multiple wavelengths. It was proven that a diffraction grating imaging system works well as a 3-D imaging system in our previous studies. The diffraction grating imaging system has advantages such as no spherical aberration and a low-cost system, compared with the well-known 3-D imaging systems based on a lens array or a camera array. However, a diffraction grating imaging system still suffers from noises, artifacts, and blurring due to the diffraction nature and illumination of single wavelength lasers. In this paper, we propose a diffraction grating imaging system with multiple wavelengths to overcome these problems. The proposed imaging system can produce multiple volumes through multiple laser illuminators with different wavelengths. Integration of these volumes can reduce noises, artifacts, and blurring in grating imaging since the original signals of 3-D objects inside these volumes are integrated by our computational reconstruction method. To apply the multiple wavelength system to a diffraction grating imaging system efficiently, we analyze the effects on the system parameters such as spatial periods and parallax angles for different wavelengths. A computational 3-D imaging system based on the analysis is proposed to enhance the image quality in diffraction grating imaging. Optical experiments with three-wavelength lasers are conducted to evaluate the proposed system. The results indicate that our diffraction grating imaging system is superior to the existing method.

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“…The source grating G 0 is usually an absorption grating that exploits the Lau effect to achieve the needed coherence for the interferometer. Further beam shaping can be achieved with two absorption gratings [18], two phase gratings [19], or one phase and one absorption grating [7]. Since those systems usually operate with polychromatic spectra and consist of three optics, the resulting IM is well approximated with a sinusoidal function.…”

Section: Introductionmentioning

confidence: 99%

Signal Retrieval from Non-Sinusoidal Intensity Modulations in X-ray and Neutron Interferometry Using Piecewise-Defined Polynomial Function

et al. 2021

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Grating-based phase-contrast and dark-field imaging systems create intensity modulations that are usually modeled with sinusoidal functions to extract transmission, differential-phase shift, and scatter information. Under certain system-related conditions, the modulations become non-sinusoidal and cause artifacts in conventional processing. To account for that, we introduce a piecewise-defined periodic polynomial function that resembles the physical signal formation process, modeling convolutions of binary periodic functions. Additionally, we extend the model with an iterative expectation-maximization algorithm that can account for imprecise grating positions during phase-stepping. We show that this approach can process a higher variety of simulated and experimentally acquired data, avoiding most artifacts.

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Dual phase grating based X-ray differential phase contrast imaging with source grating: theory and validation

Cited by 19 publications

References 37 publications

Performance evaluation of dual‐energy CT and differential phase contrast CT in quantitative imaging applications

Performance evaluation of dual‐energy CT and differential phase contrast CT in quantitative imaging applications

Computational Three-Dimensional Imaging System via Diffraction Grating Imaging with Multiple Wavelengths

Signal Retrieval from Non-Sinusoidal Intensity Modulations in X-ray and Neutron Interferometry Using Piecewise-Defined Polynomial Function

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