Spatial resolution in Bragg‐magnified X‐ray images as determined by Fourier analysis

Modregger, Peter; Lübbert, D.; Schäfer, P.; Köhler, R.

doi:10.1002/pssa.200675685

Cited by 51 publications

(54 citation statements)

References 10 publications

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“…Each sector of the beamshaper produces a spot in the back-focal plane of the objective lens. The resolution of the system has been measured according to Modregger et al [12]: we obtained a value of 133 nm for 2D images and 144 nm for 3D images, i.e. very close to the Rayleigh limit of R Rayleigh = 1.22r = 122 nm.…”

Section: Instrumentationsupporting

confidence: 62%

Hard X-ray Phase-Contrast Tomographic Nanoimaging

Stampanoni¹,

Marone²,

Vila‐Comamala³

et al. 2011

AIP Conference Proceedings

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Abstract. Synchrotron-based full-field tomographic microscopy established itself as a tool for noninvasive investigations. Many beamlines worldwide routinely achieve micrometer spatial resolution while the isotropic 100-nm barrier is reached and trespassed only by few instruments, mainly in the soft x-ray regime. We present an x-ray, full-field microscope with tomographic capabilities operating at 10 keV and with a 3D isotropic resolution of 144 nm recently installed at the TOMCAT beamline of the Swiss Light Source. Custom optical components, including a beam-shaping condenser and phase-shifting dot arrays, were used to obtain an ideal, aperture-matched sample illumination and very sensitive phase-contrast imaging. The instrument has been successfully used for the nondestructive, volumetric investigation of single, unstained cells.

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Section: Instrumentationsupporting

confidence: 62%

Hard X-ray Phase-Contrast Tomographic Nanoimaging

Stampanoni¹,

Marone²,

Vila‐Comamala³

et al. 2011

AIP Conference Proceedings

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“…In both cases, the effective spatial resolution limit was determined by the intersection point (black arrows) of an averaged PSD curve and twice the level of featureless region dominated by noise. 27 The cut-off frequencies indicate therefore the half-period spatial resolution limits of the amplitude image at 10.1 nm and of the phase shift image at 10 nm, which are very close to the pixel size (8.3 nm).…”

mentioning

confidence: 78%

Influence of finite spatial coherence on ptychographic reconstruction

Stachnik

Mohácsi

Vartiainen

et al. 2015

Applied Physics Letters

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X-ray ptychography is an ultrahigh-resolution scanning coherent diffractive imaging technique, allowing quantitative measurements of extended samples and a simultaneous reconstruction of the illuminating wavefront. Recent development of the mixed-state reconstruction algorithm has triggered a certain interest in utilizing partially coherent X-ray sources for ptychography. Here, we study how finite spatial coherence influences the reconstructed image of a test structure. Our work shows that use of a highly coherent illumination provides images with better spatial resolution and fewer artefacts than the approach with partial coherence.

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“…It means that improving the temporal resolution by a factor of 7.5 the SNR gets poorer by only a factor of 2. The spatial resolutions evaluated with two methods, the first based on the power spectrum of the images [7] the second by fitting the line profiles, does not show a trend similar to SNR. The spatial resolution remains uneffected at a value of about 2.5 pixels for all scans.…”

Section: Static Sample: Optimization Of the Scan Qualitymentioning

confidence: 92%

Real Time Tomography at the Swiss Light Source

Marone

Stampanoni

2010

AIP Conference Proceedings

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The penetrating power of X-rays coupled with the high flux of 3rd generation synchrotron sources makes X-ray tomography to excel among fast imaging methods . To exploit this asset of synchrotron sources is the motivation for setting up an ultra-fast tomography endstation at the TOMCAT beamline. The state of the art instruments at synchrotron sources offer routinely a temporal resolution of tens of seconds in tomography. For a number of applications, for example biomedical studies, the relevant time scales (breathing, heartbeat) are rather in the range of 0.5-2 seconds. To overcome motion artifacts when imaging such systems a new ultra-fast tomographic data acquisition scheme is being developed at the TOMCAT beamline. We can acquire a full set of projections at sub-second timescale in monochromatic or white-beam configuration. We present a feasibility study with the ultimate aim to achieve sub-second temporal resolution in 3D without significant deterioration of the spatial resolution. Abstract. The penetrating power of X-rays coupled with the high flux of 3rd generation synchrotron sources makes Xray tomography to excel among fast imaging methods . To exploit this asset of synchrotron sources is the motivation for setting up an ultra-fast tomography endstation at the TOMCAT beamline. The state of the art instruments at synchrotron sources offer routinely a temporal resolution of tens of seconds in tomography. For a number of applications, for example biomedical studies, the relevant time scales (breathing, heartbeat) are rather in the range of 0.5-2 seconds. To overcome motion artifacts when imaging such systems a new ultra-fast tomographic data acquisition scheme is being developed at the TOMCAT beamline. We can acquire a full set of projections at sub-second timescale in monochromatic or whitebeam configuration. We present a feasibility study with the ultimate aim to achieve sub-second temporal resolution in 3D without significant deterioration of the spatial resolution. For the first time, the 3D dynamics of the very early stages of a quickly aging liquid foam can be visualised with high quality and sufficiently large field of view.

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Spatial resolution in Bragg‐magnified X‐ray images as determined by Fourier analysis

Cited by 51 publications

References 10 publications

Hard X-ray Phase-Contrast Tomographic Nanoimaging

Hard X-ray Phase-Contrast Tomographic Nanoimaging

Influence of finite spatial coherence on ptychographic reconstruction

Real Time Tomography at the Swiss Light Source

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