Mathematics of Neutron Imaging

Tobin, Kenneth W.; Bingham, Philip R.; Gregor, Jens

doi:10.1007/978-0-387-78693-3_7

Cited by 7 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A more detailed description of the approach used to convert neutron radiographs into high-contrast images can be found elsewhere [7,12], but we offer an abbreviated description of the iterative reconstruction method here. A tomographic image can be reconstructed from a set of projection images of an object, taken at different angles, using either an analytic or an iterative algorithm.…”

Section: Conversion Of Neutron Radiographs Into a Tomographic Imagementioning

confidence: 99%

“…As our data have intrinsically low contrast due to the low hydrogen content and the desire for a large number of projections has to be traded off against a long exposure time for each projection, we chose to implement an iterative reconstruction algorithm and use parallel computing techniques to offset the associated cost/time constraints. We refer to [12] for a review of the underlying math, and for a more intuitive description of how the images are reconstructed, please see [7]. …”

Section: Conversion Of Neutron Radiographs Into a Tomographic Imagementioning

confidence: 99%

See 1 more Smart Citation

Progression of Soot Cake Layer Properties During the Systematic Regeneration of Diesel Particulate Filters Measured with Neutron Tomography

Toops

Pihl

Finney

et al. 2015

Emiss. Control Sci. Technol.

View full text Add to dashboard Cite

Although particulate filters (PFs) have been a key component of the emission control system for modern diesel engines, there remain significant questions about the basic regeneration behavior of the filters and how it changes with accumulation of increasing soot layers. This effort describes a systematic deposition and regeneration of particulate matter in 25-mm diameter×76-mm long wall-flow PFs composed of silicon carbide (SiC) material. The initial soot distributions were analyzed for soot cake thickness using a nondestructive neutron imaging technique. With the PFs intact, it was then possible to sequentially regenerate the samples and reanalyze them, which was performed after nominal 20, 50, and 70 % regenerations. The loaded samples show a relatively uniform distribution of particulate with an increasing soot cake thickness and nearly identical initial density of 70 mg/cm 3 . During regeneration, the soot cake thickness initially decreases significantly while the density increases to 80-90 mg/cm 3 . After ∼50 % regeneration, the soot cake thickness stays relatively constant, but instead, the density decreases as pores open up in the layer (∼35 mg/cm 3 at 70 % regeneration). Complete regeneration initially occurs at the rear of the PF channels. With this information, a conceptual model of the regeneration is proposed.

show abstract

Section: Conversion Of Neutron Radiographs Into a Tomographic Imagementioning

confidence: 99%

Section: Conversion Of Neutron Radiographs Into a Tomographic Imagementioning

confidence: 99%

Progression of Soot Cake Layer Properties During the Systematic Regeneration of Diesel Particulate Filters Measured with Neutron Tomography

Toops

Pihl

Finney

et al. 2015

Emiss. Control Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…By selecting the fitting function appropriately, the resolution can be analytically calculated with parameters from fitting the ESF. Various types of unsharpness caused by sample vibration, neutron diffusion, scintillator, camera, and so on are expressed as unique functions [22][23][24]. LSF is generally approximated as Gaussian by convolution of functions of all unsharpness on the basis of the central limit theorem [22,23].…”

Section: Methods For Calculating Spatial Resolutionmentioning

confidence: 99%

The First Application of a Gd3Al2Ga3O12:Ce Single-Crystal Scintillator to Neutron Radiography

et al. 2021

View full text Add to dashboard Cite

Neutron radiography is regarded as complementary to X-ray radiography in terms of transmittance through materials, but its spatial resolution is still insufficient. In order to achieve higher resolution in neutron imaging, several approaches have been adopted, such as optical magnification and event centroiding. In this paper, the authors focused on modification of the scintillator. A Gd3Al2Ga3O12:Ce single-crystal scintillator was applied to neutron radiography for the first time and a spatial resolution of 10.5 μm was achieved. The results indicate that this material can be a powerful candidate for a new neutron scintillator providing a resolution in micrometer order by optimizing the optical system and increasing the scintillator luminosity.

show abstract

“…These characteristics have been employed for imaging with neutrons since the earliest days of neutron science, and have been developed into a wide variety of investigation techniques [1][2][3][4]. Chapters of the recent book edited by Anderson, McGreevy and Bilheux provide good background on neutron imaging principles [5][6][7][8][9][10].…”

Section: Jinst 7 P02014mentioning

confidence: 99%

Detection system for microimaging with neutrons

et al. 2012

View full text Add to dashboard Cite

A new high-resolution detector setup for neutron imaging has been developed based on infinity-corrected optics with high light collection, combined with customized mounting hardware. The system can easily be installed, handled and fitted to any existing facility, avoiding the necessity of complex optical systems or further improved electronics (CCD). This is the first time optical magnification higher than 1:1 has been used with scintillator-based neutron detectors, as well as the first implementation of infinity corrected optics for neutron imaging, achieving the smallest yet reported effective pixel size of 3.375 µm. A novel transparent crystal scintillator (GGG crystal) has been implemented with neutrons for the first time to overcome limitations of traditional powder scintillators (Li6/ZnS, Gadox). The standardized procedure for resolution measurements with the Modulation Transfer Function (MTF) is summarized to facilitate comparison between instruments and facilities. Using this new detector setup, a resolution of 14.8 µm with a field of view of 6 mm ×6 mm has been achieved while maintaining reasonable count times. These advances open a wide range of new possible research applications and allow the potential for additional future developments.

show abstract

Mathematics of Neutron Imaging

Cited by 7 publications

References 29 publications

Progression of Soot Cake Layer Properties During the Systematic Regeneration of Diesel Particulate Filters Measured with Neutron Tomography

Progression of Soot Cake Layer Properties During the Systematic Regeneration of Diesel Particulate Filters Measured with Neutron Tomography

The First Application of a Gd3Al2Ga3O12:Ce Single-Crystal Scintillator to Neutron Radiography

Detection system for microimaging with neutrons

Contact Info

Product

Resources

About