Measurement of hard X-ray coherence in the presence of a rotating random-phase-screen diffuser

Morgan, Kaye S.; Irvine, Sarah; Suzuki, Yoshio; Uesugi, Kentaro; Takeuchi, Akihisa; Paganin, David M.; Siu, Karen Kit Wan

doi:10.1016/j.optcom.2009.09.023

Cited by 15 publications

(9 citation statements)

References 29 publications

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“…These fluctuations are caused by instabilities in the electron beam orbit of the synchrotron which, coupled with the long distance between the source and the sample (80 m) and vibration of the monochromator, mean that the vertical position of the X-ray beam varies in time over the field of view. 30 This has a strong, negative effect on the capacity of PIV algorithms to accurately detect the motion of the tracer particles. This is overcome by post-processing the raw images using a spatial frequency filter to remove the low spatial frequency signal produced by the fluctuations in the X-ray beam.…”

Section: In Vitro Imagingmentioning

confidence: 99%

X-ray Velocimetry and Haemodynamic Forces Within a Stenosed Femoral Model at Physiological Flow Rates

et al. 2011

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High resolution in vivo velocity measurements within the cardiovascular system are essential for accurate calculation of vessel wall shear stress, a highly influential factor for the progression of arterial disease. Unfortunately, currently available techniques for in vivo imaging are unable to provide the temporal resolution required for velocity measurement at physiological flow rates. Advances in technology and improvements in imaging systems are allowing a relatively new technique, X-ray velocimetry, to become a viable tool for such measurements. This study investigates the haemodynamics of pulsatile blood flow in an optically opaque in vitro model at physiological flow rates using X-ray velocimetry. The in vitro model, an asymmetric stenosis, is designed as a 3:1 femoral artery with the diameter and flow rate replicating vasculature of a mouse. Velocity measurements are obtained over multiple cycles of the periodic flow at high temporal and spatial resolution (1 ms and 29 μm, respectively) allowing accurate measurement of the velocity gradients and calculation of the wall shear stress. This study clearly illustrates the capability of in vitro X-ray velocimetry, suggesting it as a possible measurement technique for future in vivo vascular wall shear stress measurement.

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Section: In Vitro Imagingmentioning

confidence: 99%

X-ray Velocimetry and Haemodynamic Forces Within a Stenosed Femoral Model at Physiological Flow Rates

et al. 2011

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“…Another important application of diffusers is in the deliberate creation of speckles for X-ray Speckle tracking techniques [1][2][3]. A diffuser typically consists of some short-range ordered material, such as paper, a piece of wood [4], nano-porous beryllium [5] or carbon [6,7], and sveral others [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of Gaussian random phase screen model for x-ray diffusers

et al. 2019

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The beam diffusing properties of stacked layers of diffuser material were evaluated experimentally and compared to a Gaussian random phase screen model. The model was found to give promising accuracy in combination with a Lorentzian auto-correlation model. The tail behaviour of the angular scattering distribution as a function of number of diffusing layers was particularly well described by the model, and in the case of an amorphous carbon diffuser, the model could describe the whole of the scattering distribution convincingly.

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“…a spinning thin disc or amorphous boron powder, were used earlier as effective x-ray diffusers [4]. Using a rotating random-phase screen allows to reduce the degree of radiation coherence and enhance speckle elimination in transmission images [5]. Speckle-suppressor using porous beryllium was demonstrated efficiency of porous beryllium due to its high level of X-ray scattering.…”

Section: Introductionmentioning

confidence: 99%

The Small-angle X-Ray Scattering Investigation of Advanced Beryllium Materials

Kozlova¹,

Gorlevsky²,

Семенов³

et al. 2018

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The small-angle X-ray scattering (SAXS) technique allows to determine size distributions of inhomogeneities in materials and to predict their properties in Xray optics devices. A number of beryllium materials for the manufacturing of X-ray optics (refractive lenses and speckle suppressors) have been studied by the SAXS.Various composite materials based on porous beryllium have been studied. The effect of adding detonation nanodiamonds to the beryllium matrix on the scattering ability of the material is discussed.

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Measurement of hard X-ray coherence in the presence of a rotating random-phase-screen diffuser

Cited by 15 publications

References 29 publications

X-ray Velocimetry and Haemodynamic Forces Within a Stenosed Femoral Model at Physiological Flow Rates

X-ray Velocimetry and Haemodynamic Forces Within a Stenosed Femoral Model at Physiological Flow Rates

Experimental investigation of Gaussian random phase screen model for x-ray diffusers

The Small-angle X-Ray Scattering Investigation of Advanced Beryllium Materials

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