Retrieving the Ultrasmall-Angle X-Ray Scattering Signal with Polychromatic Radiation in Speckle-Tracking and Beam-Tracking Phase-Contrast Imaging

SAXS shows that in polystyrene (PS)/polyisoprene (PI) block copolymers with lamellar morphologies there is a sufficient electron density difference for x-ray scattering [1]. It has been accepted, however, that this difference is insufficient for TEM imaging by amplitude contrast. Therefore, contrast has been produced by staining the PI phase with OsO4 [2]. Staining changes the mechanical and chemical structure of the PI phase perhaps altering the phase separation and the domain interfaces (figure 1).Mean inner potential calculations, however, show potentials of 8.29V for PS and 7.57V for PI. This indicates that for a simple specimen geometry (e.g. lamellar) with sharp phase interfaces oriented parallel to the incident beam, a film 500Å thick will provide a phase change (Δψ) of 0.3 radians at 100 KV. This phase change is sufficient for imaging under defocus conditions and contains information about the interface region between the domains. The phase change may be increased by using lower voltage (50% increase at 40 KV).

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X-ray microscopy using two phase contrast imaging techniques: two dimensional grating interferometry and speckle tracking

Journal of Physics Conference Series ◽

10.1088/1742-6596/463/1/012042 ◽

2013 ◽

Vol 463 ◽

pp. 012042 ◽

Cited By ~ 3

Author(s):

Hongchang Wang ◽

Sebastien Berujon ◽

Ian Pape ◽

Kawal Sawhney

Keyword(s):

Speckle Tracking ◽

Phase Contrast ◽

Imaging Techniques ◽

Phase Contrast Imaging ◽

Two Dimensional ◽

Contrast Imaging ◽

Two Phase ◽

X Ray

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Comparison of laboratory grating-based and speckle-tracking x-ray phase-contrast imaging

Journal of Physics Conference Series ◽

10.1088/1742-6596/849/1/012035 ◽

2017 ◽

Vol 849 ◽

pp. 012035 ◽

Cited By ~ 1

Author(s):

J. Romell ◽

T. Zhou ◽

M. Zdora ◽

S. Sala ◽

F.J. Koch ◽

...

Keyword(s):

Speckle Tracking ◽

Phase Contrast ◽

Phase Contrast Imaging ◽

Contrast Imaging ◽

X Ray

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Commentary: Is X-ray Phase Contrast Imaging an Anatomical Klondike for Surgeons?

Seminars in Thoracic and Cardiovascular Surgery ◽

10.1053/j.semtcvs.2020.04.011 ◽

2020 ◽

Vol 32 (4) ◽

pp. 969-970

Author(s):

Sergio A. Carrillo

Keyword(s):

Phase Contrast ◽

Phase Contrast Imaging ◽

Contrast Imaging ◽

X Ray

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Image Quality Analysis of X-ray Grating Interferometer Using Integrating-bucket Method

Journal of Imaging Science and Technology ◽

10.2352/j.imagingsci.technol.2020.64.2.020503 ◽

2020 ◽

Vol 64 (2) ◽

pp. 20503-1-20503-5

Author(s):

Faiz Wali ◽

Shenghao Wang ◽

Ji Li ◽

Jianheng Huang ◽

Yaohu Lei ◽

...

Keyword(s):

Image Quality ◽

Phase Contrast ◽

Quality Analysis ◽

Phase Contrast Imaging ◽

Phase Image ◽

Contrast Imaging ◽

High Quality ◽

Image Quality Analysis ◽

X Ray ◽

Grating Interferometer

Abstract Grating-based x-ray phase-contrast imaging has the potential to enhance image quality and provide inner structure details non-destructively. In this work, using grating-based x-ray phase-contrast imaging system and employing integrating-bucket method, the quantitative expressions of signal-to-noise ratios due to photon statistics and mechanical error are analyzed in detail. Photon statistical noise and mechanical error are the main sources affecting the image noise in x-ray grating interferometry. Integrating-bucket method is a new phase extraction method translated to x-ray grating interferometry; hence, its image quality analysis would be of great importance to get high-quality phase image. The authors’ conclusions provide an alternate method to get high-quality refraction signal using grating interferometer, and hence increases applicability of grating interferometry in preclinical and clinical usage.

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