Coded-aperture imaging systems: Past, present and future development – A review

Cieślak, M.; Gamage, Kelum A. A.; Glover, R.

doi:10.1016/j.radmeas.2016.08.002

Cited by 148 publications

(64 citation statements)

References 51 publications

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“…A preceding study identified single stilbene crystal as a suitable solution for the imaging system [37]. The results obtained not only do support the claim of the preceding study, but also show that neutrons and gamma-ray photons can be clearly separated within the stilbene crystal.…”

Section: Discussionsupporting

confidence: 80%

Pulse shape discrimination characteristics of stilbene crystal, pure and ⁶Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

2017

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Pulse shape discrimination characteristics of stilbene crystal, pure and 6 Li loaded plastic scintillators for a high resolution coded-aperture neutron imagerTo cite this article: M.J. Cielak et al 2017 JINST 12 P07023 View the article online for updates and enhancements. Related contentInvestigation into a suitable scintillator and coded-aperture material for a mixed-field radiation imaging system M.J. Cielak, K.A.A. Gamage and R. Glover A: Pulse shape discrimination performances of single stilbene crystal, pure plastic and 6 Li loaded plastic scintillators have been compared. Three pulse shape discrimination algorithms have been tested for each scintillator sample, assessing their quality of neutron/gamma separation. Additionally, the digital implementation feasibility of each algorithm in a real-time embedded system was evaluated. Considering the pixelated architecture of the coded-aperture imaging system, a reliable method of simultaneous multi-channel neutron/gamma discrimination was sought, accounting for the short data analysis window available for each individual channel. In this study, each scintillator sample was irradiated with a 252 Cf neutron source and a bespoke digitiser system was used to collect the data allowing detailed offline examination of the sampled pulses. The figure-of-merit was utilised to compare the discrimination quality of the collected events with respect to various discrimination algorithms. Single stilbene crystal presents superior neutron/gamma separation performance when compared to the plastic scintillator samples.

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Section: Discussionsupporting

confidence: 80%

Pulse shape discrimination characteristics of stilbene crystal, pure and ⁶Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

2017

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“…Spectrally-Flat patterns: The family includes pseudo-noise binary (0/1) patterns such as maximum length sequences (MLS) and uniform redundant array patterns such as URA and MURA. Onwards, we refer to patterns with the following properties as spectrally-flat patterns: (i) ρ ≈ 1/2 (there is one more one than zero); (ii) they are spectrally flat with the exception of a DC term [16,17,18,19].…”

Section: Modelmentioning

confidence: 99%

Analysis and Optimization of Aperture Design in Computational Imaging

Yedidia¹,

Thrampoulidis²,

Wornell³

2018

2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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There is growing interest in the use of coded aperture imaging systems for a variety of applications. Using an analysis framework based on mutual information, we examine the fundamental limits of such systems-and the associated optimum aperture coding-under simple but meaningful propagation and sensor models. Among other results, we show that when thermal noise dominates, spectrally-flat masks, which have 50% transmissivity, are optimal, but that when shot noise dominates, randomly generated masks with lower transmissivity offer greater performance. We also provide comparisons to classical pinhole cameras.Index Termscoded aperture cameras, computational photography, optical signal processing

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“…Apart from simple collimators, hard X-rays are often imaged using coded masks, which cast a particular shadow pattern on an imaging detector, allowing the reconstruction of the location of the illuminating sources (Cieślak et al 2016;Caroli et al 1987;Groeneveld 1999, and references therein). A fraction of the incident photons is absorbed by the opaque pixels of the mask.…”

Section: Randomization Of the Psfmentioning

confidence: 99%

SIXTE: a generic X-ray instrument simulation toolkit

Dauser

Falkner

Lorenz

et al. 2019

A&A

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We give an overview of the SImulation of X-ray TElescopes (SIXTE) software package, a generic, mission-independent Monte Carlo simulation toolkit for X-ray astronomical instrumentation. The package is based on a modular approach for the source definition, the description of the optics, and the detector type such that new missions can be easily implemented. The targets to be simulated are stored in a flexible input format called SIMPUT. Based on this source definition, a sample of photons is produced and then propagated through the optics. In order to model the detection process, the software toolkit contains modules for various detector types, ranging from proportional counter and Si-based detectors, to more complex descriptions like transition edge sensor (TES) devices. The implementation of characteristic detector effects and a detailed modeling of the read-out process allow for representative simulations and therefore enable the analysis of characteristic features, such as for example pile-up, and their impact on observations. We present an overview of the implementation of SIXTE from the input source, the imaging, and the detection process, highlighting the modular approach taken by the SIXTE software package. In order to demonstrate the capabilities of the simulation software, we present a selection of representative applications, including the all-sky survey of eROSITA and a study of pile-up effects comparing the currently operating XMM-Newton with the planned Athena-WFI instrument. A simulation of a galaxy cluster with the Athena-X-IFU shows the capability of SIXTE to predict the expected performance of an observation for a complex source with a spatially varying spectrum and our current knowledge of the future instrument.

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Coded-aperture imaging systems: Past, present and future development – A review

Cited by 148 publications

References 51 publications

Pulse shape discrimination characteristics of stilbene crystal, pure and ⁶Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

Pulse shape discrimination characteristics of stilbene crystal, pure and ⁶Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

Analysis and Optimization of Aperture Design in Computational Imaging

SIXTE: a generic X-ray instrument simulation toolkit

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Coded-aperture imaging systems: Past, present and future development – A review

Cited by 148 publications

References 51 publications

Pulse shape discrimination characteristics of stilbene crystal, pure and 6Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

Pulse shape discrimination characteristics of stilbene crystal, pure and 6Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

Analysis and Optimization of Aperture Design in Computational Imaging

SIXTE: a generic X-ray instrument simulation toolkit

Contact Info

Product

Resources

About

Pulse shape discrimination characteristics of stilbene crystal, pure and ⁶Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

Pulse shape discrimination characteristics of stilbene crystal, pure and ⁶Li loaded plastic scintillators for a high resolution coded-aperture neutron imager