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<p class="MsoNormal"><u><span style="font-size:11.0pt">Title: </span></u><b><span style="font-size:12.0pt">Computational Metrology for Neutron Interferometric Microscopy<o:p></o:p></span></b></p>
<p class="MsoNormal"><u><span style="font-size:12.0pt">Job Position: </span></u><b><span style="font-size:12.0pt">Postdoctoral researcher at NIST<o:p></o:p></span></b></p>
<p class="MsoNormal"><u><span style="font-size:12.0pt">Keywords: </span></u><b><span style="font-size:12.0pt">imaging; image analyses; machine learning; software engineering</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:11.0pt"><o:p><span style="text-decoration:none"> </span></o:p></span></u></p>
<p class="MsoNormal" style="text-align:justify"><u><span style="font-size:11.0pt">Project Description:
</span></u><span style="font-size:12.0pt">NIST is developing a novel neutron interferometric phase imaging method using a grating-based, far-field interferometer with 1000</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif">×</span><span style="font-size:12.0pt">
increase in time resolution and 10</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif">×</span><span style="font-size:12.0pt"> improvement in spatial resolution over prototypes. Such an instrument enables to measure the structure of heterogeneous
systems including ageing concrete, blood clots, highly-efficient batteries, multiphase flow in colloidal and geological systems, and the burgeoning field of metal 3D printing. As this far-field neutron interferometer will be generating terabytes of image data
per day, there are several open research problems that would be the research focus of a postdoctoral candidate. The problems include finding optimal imaging configurations, accelerated 3D tomographic reconstruction from multiple 2D images and multiple channels,
optimization of 2D projection viewpoints (dose reduction and time savings), the use of artificial intelligence and traditional machine learning models for 3D volume segmentation, designing tools for 3D segmentation annotation and verification, registration
of 3D volumes, evaluations of accuracy and uncertainties of image analyses, visualization of multiple terabyte-sized 3D volumes, quantification and statistical analyses of volume characteristics, and dissemination of petabyte-sized 3D image collections with
web-based visual inspection and browsing capabilities. A small subset of project relevant publications is listed below. A candidate should have at least a master’s degree in computer science or related field and have background in imaging, image analyses,
machine learning, and software engineering.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:4.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:12.0pt">References:<o:p></o:p></span></u></p>
<p class="MsoNormal">(1) A. J. Brooks et al, “Neutron interferometry detection of early crack formation caused by bending fatigue in additively manufactured SS316 dogbones,” Materials and Design, 140 (2018) 420–430 https://doi.org/10.1016/j.matdes.2017.12.001<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(2) D. A. Pushin et al, “Far-field interference of a neutron white beam and the applications to noninvasive<o:p></o:p></p>
<p class="MsoNormal">phase-contrast imaging,” PHYSICAL REVIEW A 95, 043637 (2017)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(3) T. Pipatsrisawat et al, “Performance Analysis of The Filtered Backprojection Image Reconstruction Algorithms,” ICASSP 2015.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(4) D.M. Pelt and J.A. Sethian, “A mixed-scale dense convolutional neural network for image analysis,” PNAS, January 8, 2019.<o:p></o:p></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">If interested then, please, contact:</span></b><span style="font-size:14.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Peter Bajcsy, PhD<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Information Technology Laboratory (ITL)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">National Institute of Standards and Technologies (NIST)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Phone: 301-975-2958<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Email: </span><span style="font-size:14.0pt"><a href="mailto:peter.bajcsy@nist.gov">peter.bajcsy@nist.gov</a></span><span style="font-size:14.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">URL: </span><span style="font-size:14.0pt"><a href="https://www.nist.gov/people/peter-bajcsy">https://www.nist.gov/people/peter-bajcsy</a></span><span style="font-size:14.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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