Common characteristics shared by different differential phase contrast imaging methods

Zhu, Ping; Zhu, Zhen‐Gang; Ye, Hong; Zhang, Kai; Huang, Wanxia; Qin, Yuan; Zhao, Xinyan; Ju, Zaiqiang; Zhang, Wu; Wei, Zheng; Wiebe, Sheldon; Chapman, L. D.

doi:10.1364/ao.53.000861

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…[11,12] Though, their configurations are different but they share some common characteristics. [15] The performance of all differential phase-contrast imaging can be depicted by rocking curve in DEI, [16] phase-stepping curve or shifting curve (SC) in grating-based imaging [8,[17][18][19] and illumination curve in edge illumination [20] imaging. According to angular signal radiography (ASR) point of view rocking curve, phase stepping curve, and illumination curve are all angular signal response functions in the differential phasecontrast imaging.…”

Section: Introductionmentioning

confidence: 99%

Signal-to-noise ratio comparison of angular signal radiography and phase stepping method

Wali¹,

Zhu²,

Hu³

et al. 2017

Chinese Phys. B

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Grating-based x-ray phase contrast imaging has the potential to be applied in future medical applications as it is compatible with both laboratory and synchrotron source. However, information retrieval methods are important because acquisition speed, scanning mode, image quality, and radiation dose depend on them. Phase-stepping (PS) is a widely used method to retrieve information, while angular signal radiography (ASR) is a newly established method. In this manuscript, signal-to-noise ratios (SNRs) of ASR are compared with that of PS. Numerical experiments are performed to validate theoretical results. SNRs comparison shows that for refraction and scattering images ASR has higher SNR than PS method, while for absorption image both methods have same SNR. Therefore, our conclusions would have guideline in future preclinical and clinical applications.

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Section: Introductionmentioning

confidence: 99%

Signal-to-noise ratio comparison of angular signal radiography and phase stepping method

Wali¹,

Zhu²,

Hu³

et al. 2017

Chinese Phys. B

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“…DEI not only introduced refraction and scattering information for radiography (Oltulu, 2003) but also triggered the development of other phase contrast imaging methods Munro & Olivo, 2013). In particular, as a reference model, its conclusion can be generalized to many collimatoranalyzer-based imaging methods (Zhu et al, 2014). Although DEI has been developed for more than a decade, many research issues still need to be clarified and improved.…”

Section: Introductionmentioning

confidence: 99%

A novel crystal-analyzer phase retrieval algorithm and its noise property

Yuan

Wang

et al. 2015

J Synchrotron Radiat

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A description of the rocking curve in diffraction enhanced imaging (DEI) is presented in terms of the angular signal response function and a simple multi-information retrieval algorithm based on the cosine function fitting. A comprehensive analysis of noise properties of DEI is also given considering the noise transfer characteristic of the X-ray source. The validation has been performed with synchrotron radiation experimental data and Monte Carlo simulations based on the Geant4 toolkit combined with the refractive process of X-rays, which show good agreement with each other. Moreover, results indicate that the signal-to-noise ratios of the refraction and scattering images are about one order of magnitude better than that of the absorption image at the edges of low-Z samples. The noise penalty is drastically reduced with the increasing photon flux and visibility. Finally, this work demonstrates that the analytical method can build an interesting connection between DEI and GDPCI (grating-based differential phase contrast imaging) and is widely suitable for a variety of measurement noise in the angular signal response imaging prototype. The analysis significantly contributes to the understanding of noise characteristics of DEI images and may allow improvements to the signal-to-noise ratio in biomedical and material science imaging.

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“…The advantage of using x-ray phase contrast in x-ray imaging has been attracting attention, especially since the 1990s, [1] owing to the development of digital x-ray imaging technologies, including x-ray signal detection schemes [2][3][4][5][6][7][8][9][10] and information extraction algorithms. [11][12][13][14][15][16][17][18][19][20] Among the x-ray signal detection schemes, grating-based x-ray phase imaging is considered to be the most promising approach for future clinical medical imaging [1] because of its large field of view and good compatibility with conventional x-ray sources, [5,21] and the extension to computed tomography [22] is capable of assessing quantitative information about the three-dimensional (3D) geometry and properties [23][24][25][26] of a sample. Meanwhile, several information extraction algorithms [2,3,6,15] have been developed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of noise properties in grating-based x-ray phase tomography with reverse projection method

et al. 2015

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The relationship between noise variance and spatial resolution in grating-based x-ray phase computed tomography (PCT) imaging is investigated with reverse projection extraction method, and the noise variances of the reconstructed absorption coefficient and refractive index decrement are compared. For the differential phase contrast method, the noise variance in the differential projection images follows the same inverse-square law with spatial resolution as in conventional absorption-based x-ray imaging projections. However, both theoretical analysis and simulations demonstrate that in PCT the noise variance of the reconstructed refractive index decrement scales with spatial resolution follows an inverse linear relationship at fixed slice thickness, while the noise variance of the reconstructed absorption coefficient conforms with the inverse cubic law. The results indicate that, for the same noise variance level, PCT imaging may enable higher spatial resolution than conventional absorption computed tomography (ACT), while ACT benefits more from degraded spatial resolution. This could be a useful guidance in imaging the inner structure of the sample in higher spatial resolution.

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Common characteristics shared by different differential phase contrast imaging methods

Cited by 9 publications

References 16 publications

Signal-to-noise ratio comparison of angular signal radiography and phase stepping method

Signal-to-noise ratio comparison of angular signal radiography and phase stepping method

A novel crystal-analyzer phase retrieval algorithm and its noise property

Investigation of noise properties in grating-based x-ray phase tomography with reverse projection method

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