TY - JOUR
T1 - Detection with polychromatic x-ray pencil beam illumination
T2 - information-theoretic bounds
AU - Treeaporn, Vicha
AU - Neifeld, Mark A.
N1 - Funding Information:
Department of Homeland Security, Science and Technology Division, 13-05 research activity (HSHQDC-14-C-B0010). The authors would like to thank Prof. Michael Gehm and Prof. David Brady at Duke University for providing the x-ray scatter measurement data.
PY - 2018/3/20
Y1 - 2018/3/20
N2 - Non-destructive testing (NDT) by x-ray imaging is commonly used for finding manufacturing defects, cargo inspection, or security screening. These tasks can be regarded as examples of a detection problem where a target is either present or not. Task-specific information (TSI) [J. Opt. Soc. Am. A 24, B25 (2007); Appl. Opt. 47, 4457 (2008)] bounds, an information-theoretic based metric, are presented for a threat detection task. A system using polychromatic x-ray pencil beam object illumination and energy-resolving detectors for both absorption and diffraction measurements is employed for this task. Water and diesel are two liquids chosen as non-threat and threat materials, respectively, for this study. Three different threat class configurations are examined: a homogeneous object with fixed thickness, a homogeneous object with stochastic thickness, and a dual-material object (i.e., representing a target and clutter) with stochastic thickness, where the threat material has a fixed thickness. We find for the threat class composed of a dual-material object that a minimum threat thickness of 4.5 cm is needed to achieve a desired TSI ≥ 0.7 using a joint absorption and diffraction measurement.
AB - Non-destructive testing (NDT) by x-ray imaging is commonly used for finding manufacturing defects, cargo inspection, or security screening. These tasks can be regarded as examples of a detection problem where a target is either present or not. Task-specific information (TSI) [J. Opt. Soc. Am. A 24, B25 (2007); Appl. Opt. 47, 4457 (2008)] bounds, an information-theoretic based metric, are presented for a threat detection task. A system using polychromatic x-ray pencil beam object illumination and energy-resolving detectors for both absorption and diffraction measurements is employed for this task. Water and diesel are two liquids chosen as non-threat and threat materials, respectively, for this study. Three different threat class configurations are examined: a homogeneous object with fixed thickness, a homogeneous object with stochastic thickness, and a dual-material object (i.e., representing a target and clutter) with stochastic thickness, where the threat material has a fixed thickness. We find for the threat class composed of a dual-material object that a minimum threat thickness of 4.5 cm is needed to achieve a desired TSI ≥ 0.7 using a joint absorption and diffraction measurement.
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U2 - 10.1364/AO.57.001977
DO - 10.1364/AO.57.001977
M3 - Article
AN - SCOPUS:85044116553
VL - 57
SP - 1977
EP - 1992
JO - Applied Optics
JF - Applied Optics
SN - 1559-128X
IS - 9
ER -