3D-printed coded apertures for x-ray backscatter radiography

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dc.contributor.author Munoz, Andre Arelius Marcus
dc.contributor.author Vella, Anna
dc.contributor.author Healy, M. J. F.
dc.contributor.author Lane, David W.
dc.contributor.author Jupp, Ian
dc.contributor.author Lockley, D.
dc.date.accessioned 2017-10-18T10:55:08Z
dc.date.available 2017-10-18T10:55:08Z
dc.date.issued 2017-09-07
dc.identifier.citation Munoz AAM, Vella A, Healy MJF, Lane DW, Jupp I, Lockley D (2017). 3D-printed coded apertures for x-ray backscatter radiography; Proceedings of SPIE 10393, Radiation Detectors in Medicine, Industry, and National Security XVIII, 103930F. (DOI: 10.1117/12.2273756) en_UK
dc.identifier.issn 0277-786X
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/12655
dc.description Copyright 2017 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. en_UK
dc.description.abstract Many different mask patterns can be used for X-ray backscatter imaging using coded apertures, which can find application in the medical, industrial and security sectors. While some of these patterns may be considered to have a self-supporting structure, this is not the case for some of the most frequently used patterns such as uniformly redundant arrays or any pattern with a high open fraction. This makes mask construction difficult and usually requires a compromise in its design by drilling holes or adopting a no two holes touching version of the original pattern. In this study, this compromise was avoided by 3D printing a support structure that was then filled with a radiopaque material to create the completed mask. The coded masks were manufactured using two different methods, hot cast and cold cast. Hot casting involved casting a bismuth alloy at 80°C into the 3D printed acrylonitrile butadiene styrene mould which produced an absorber with density of 8.6 g cm-3. Cold casting was undertaken at room temperature, when a tungsten/epoxy composite was cast into a 3D printed polylactic acid mould. The cold cast procedure offered a greater density of around 9.6 to 10 g cm-3 and consequently greater X-ray attenuation. It was also found to be much easier to manufacture and more cost effective. A critical review of the manufacturing procedure is presented along with some typical images. In both cases the 3D printing process allowed square apertures to be created avoiding their approximation by circular holes when conventional drilling is used. en_UK
dc.language.iso en en_UK
dc.publisher SPIE en_UK
dc.title 3D-printed coded apertures for x-ray backscatter radiography en_UK
dc.type Conference paper en_UK

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