Rapid prototyping-coded masks for x-ray backscatter imaging

Andre A. M. Muñoz; Anna Vella; Matthew J. F. Healy; David W. Lane; Ian Jupp; David Lockley

doi:10.1117/1.OE.57.8.085104

22 August 2018 Rapid prototyping-coded masks for x-ray backscatter imaging

Andre A. M. Muñoz, Anna Vella, Matthew J. F. Healy, David W. Lane, Ian Jupp, David Lockley

Author Affiliations +

Optical Engineering, Vol. 57, Issue 8, 085104 (August 2018). https://doi.org/10.1117/1.OE.57.8.085104

Abstract

Coded masks (CM) often lack a self-supporting structure that is difficult to manufacture without recourse to drilled holes in place of ideal square apertures, degrading imaging properties. An alternative approach is presented with three-dimensional (3-D) printed CM molds cast with a radio-opaque material that allows square elements to be retained. Two methods are presented; hot casting a bismuth alloy (density 8.6 g cm − 3) and cold casting with tungsten powder/epoxy resin (densities 9.6 and 10.6 g cm − 3). A critical review of 3-D printed-CM fabrication along with some typical x-ray backscatter images is presented. A signal-to-noise ratio from both the machined tungsten and cold cast 3-D printed mask were comparable, with the former having a slight advantage. Also, 3-D printed cold cast masks were found to be more economical and easier to rapid prototype over traditional drilled tungsten masks.

Citation Download Citation

Andre A. M. Muñoz, Anna Vella, Matthew J. F. Healy, David W. Lane, Ian Jupp, and David Lockley "Rapid prototyping-coded masks for x-ray backscatter imaging," Optical Engineering 57(8), 085104 (22 August 2018). https://doi.org/10.1117/1.OE.57.8.085104

Received: 18 May 2018; Accepted: 7 August 2018; Published: 22 August 2018

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