Multiple Module Pixellated CdTe Spectroscopic X-Ray Detector

Wilson, M.N.; Bell, S.; Cernik, Robert J.; Christodoulou, Christiana; Egan, Christopher K.; O’Flynn, Daniel; Jacques, Simon D. M.; Pani, S.; Scuffham, James; Seller, P.; Sellin, P.J.; Speller, RD; Veale, Matthew C.

doi:10.1109/tns.2013.2240694

Cited by 28 publications

(18 citation statements)

References 18 publications

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“…In this case, exposure times are typically in the range of 30-60 s per projection [25,26], meaning the hyperspectral method in its current form is of the order of 1500 times faster for mapping/imaging. These comparisons are based upon current modestly sized energy-dispersive pixelated detectors; future developments promise faster framerates and larger areas with devices already in construction offering four times as many pixels [27]. A major limitation of energy-dispersive XRD methods is their restricted spatial resolution when compared with focused monochromatic X-ray beams which can achieve spatial resolutions down to low micrometre or sub-micrometre levels.…”

Section: Resultsmentioning

confidence: 99%

Dark-field hyperspectral X-ray imaging

et al. 2014

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In recent times, there has been a drive to develop nondestructive X-ray imaging techniques that provide chemical or physical insight. To date, these methods have generally been limited; either requiring raster scanning of pencil beams, using narrow bandwidth radiation and/or limited to small samples. We have developed a novel full-field radiographic imaging technique that enables the entire physiochemical state of an object to be imaged in a single snapshot. The method is sensitive to emitted and scattered radiation, using a spectral imaging detector and polychromatic hard X-radiation, making it particularly useful for studying large dense samples for materials science and engineering applications. The method and its extension to three-dimensional imaging is validated with a series of test objects and demonstrated to directly image the crystallographic preferred orientation and formed precipitates across an aluminium alloy friction stir weld section.

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Section: Resultsmentioning

confidence: 99%

Dark-field hyperspectral X-ray imaging

et al. 2014

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“…The sensor is a 2 cm x 2 cm x 0.1 cm CdTe wafer; the readout array has a 250 µm pixel pitch with 50 µm interpixel spacing and an energy resolution of 0.8 keV at 59.5 keV 8 . Each channel has an identical set of electronics associated with it consisting of amplifiers, charge shapers and a peak hold circuit that measures the magnitude of the pulse produced by each photon when it interacts with the CdTe material, which can then be converted to energy by linear calibration 9 . The detector can also be cooled to improve the spectral resolution.…”

Section: Hexitec Pixellated Spectroscopic Detectormentioning

confidence: 99%

Scatter-free breast imaging using a monochromator coupled to a pixellated spectroscopic detector

et al. 2015

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This project uses the combination of a spectroscopic detector and a monochromator to produce scatter free images for use in mammography. Reducing scatter is vital in mammography, where typical structures have either low contrast or small dimensions. The typical method to reduce scatter is the anti-scatter grid, which has the drawback of absorbing a fraction of the primary beam as well as scattered radiation. An increase in the dose is then required in order to compensate. Compton-scattered X-rays have lower energy than the primary beam. When using a monochromatic beam and a spectroscopic detector the scattered beam will appear at lower energies than the primary beam in the detected spectrum. Therefore if the spectrum of the detected X-rays is available, the scattered component can be windowed out of the spectrum, essentially producing a scatter free image. The monochromator used in this study is made from a Highly Orientated Pyrolytic Graphite (HOPG) crystal with a mosaic spread of 0.4°±0.1°. The detector is a pixellated spectroscopic detector that is made from a 2 cm x 2 cm x 0.1 cm CdTe crystal with a pixel pitch of 250 µm and an energy resolution of 0.8 keV at 59.5 keV. This work presents the characterisation of the monochromator and initial imaging data. The work shows a contrast increase of 20% with the removal of the low energy Compton scattered X-rays.

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“…At this rate, the ability to correct for charge sharing across pixels is still manageable. 34 A more detailed description of this ASIC can be found in the literature. 30,31 Each CdTe detector is bump-bonded onto its own ASIC, and the ASIC is mounted to a heatsink.…”

Section: Cdte Multi-pixel Detectorsmentioning

confidence: 99%

SuperHERO: the next generation hard x-ray HEROES telescope

et al. 2014

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SuperHERO is a new high-resolution, Long Duration Balloon-capable, hard-x-ray (20-75 keV) focusing telescope for making novel astrophysics and heliophysics observations. The SuperHERO payload, currently in its proposal phase, is being developed jointly by the Astrophysics Office at NASA Marshall Space Flight Center and the Solar Physics Laboratory and the Wallops Flight Facility at NASA Goddard Space Flight Center. SuperHERO is a follow-on payload to the High Energy Replicated Optics to Explore the Sun (HEROES) balloon-borne telescope that recently flew from Fort Sumner, NM in September of 2013, and will utilize many of the same features. Significant enhancements to the HEROES payload will be made, including the addition of optics, novel solid-state multi-pixel CdTe detectors, integration of the Wallops Arc-Second Pointer and a significantly lighter gondola suitable for Long Duration Flights.

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Multiple Module Pixellated CdTe Spectroscopic X-Ray Detector

Cited by 28 publications

References 18 publications

Dark-field hyperspectral X-ray imaging

Dark-field hyperspectral X-ray imaging

Scatter-free breast imaging using a monochromator coupled to a pixellated spectroscopic detector

SuperHERO: the next generation hard x-ray HEROES telescope

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