Synchrotron-based coherent scatter x-ray projection imaging using an array of monoenergetic pencil beams

Landheer, Karl; Johns, Paul

doi:10.1063/1.4754124

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…12 Another approach involves increasing the scatter signal by using brighter sources, employing multiple sources, 13 or increasing the parallelism of the measurement. 14,15 While parallelization is crucial for increasing scan rates for a xed source conguration, one runs the risk of reducing the information per photon through poor conditioning or a reduced signal to noise ratio (SNR).…”

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confidence: 99%

Structured illumination for tomographic X-ray diffraction imaging

Greenberg

Hassan

Krishnamurthy

et al. 2014

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Tomographic imaging of the molecular structure of an object is important for a variety of applications, ranging from medical and industrial radiography to security screening. X-ray diffraction imaging is the preeminent technique for performing molecular analysis of large volumes. Here we propose and demonstrate a new measurement architecture to improve the source and detector efficiency for diffraction imaging. In comparison with previous techniques, our approach reduces the required overall scan time by 1-2 orders of magnitude, which makes possible real-time scanning of a broad range of materials over a large volume using a table-top setup. This method, which relies on structuring spatially the illumination incident on an object moving relative to the X-ray source, is compatible with existing systems and has the potential to significantly enhance performance in an array of areas, such as medical diagnostic imaging and explosives detection.

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confidence: 99%

Structured illumination for tomographic X-ray diffraction imaging

Greenberg

Hassan

Krishnamurthy

et al. 2014

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“…Our research group started its imager development at a synchrotron 21,31,32 using multiple monoenergetic 33.2 keV pencil beams and the use of a Maximum-Likelihood Expectation Maximization (MLEM) algorithm to disentangle the overlapping scatter patterns to yield each beam's radial profile. Discrete photodiodes captured the primary, and a flat panel detector captured the scatter patterns.…”

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confidence: 99%

Spectrum optimization for x-ray dual-mode imager comprising radiography and coherent scatter

Kemdirim,

Johns

2024

Anomaly Detection and Imaging With X-Rays (ADIX) IX

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Medical, industrial and security x-ray systems should give images that demonstrate material contrast for accurate identification. Acquiring images simultaneously from coherently scattered x rays plus primary is an efficient way to do so. In our projection imaging system for small biological samples, the same detector is used for both primary and scatter, necessitating attenuation of the post-object primary in order that both primary and scatter lie within the detector's dynamic range. Consideration of the cross sections shows that the peak scatter-to-primary fluence ratio is nearly independent of photon energy. At lower energies, coherent scatter produces larger diffraction rings, which give better spatial separation of primary and scatter, but there is more attenuation and multibeam information disentanglement is more difficult. Previous development work for our system used a 110 kV incident beam, with a 1.5-mm-thick post-object attenuator disk of 90% W/10% Cu alloy for each of the 15 pencil beams. In this work we investigate alternatives which are less attenuating. By reducing the kV and using K-edge filters the beam average energy is lowered to achieve greater primary image contrast. Preliminary primary beam results are shown.

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