Dr. Hyoung K. Lee Profile

Dr. Hyoung K. Lee

Professor at The Univ. of New Mexico

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Publications (11)

Proceedings Article | 7 April 2023 Poster

Thermal analysis and electron beam optics for a rotating cylindrical anode based distributed x-ray source

Ashish Avachat, Jordan Fox, Wesley Tucker, Hyoung Lee

Proceedings Volume 12463, 124633T (2023) https://doi.org/10.1117/12.2654365

KEYWORDS: Electron beams, X-ray sources, Thermography, Thermal analysis, X-ray optics, X-ray computed tomography, Tungsten, Switching, Sensors, Real time imaging

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Proceedings Article | 19 March 2014 Paper

Determination of minor and trace elements in kidney stones by x-ray fluorescence analysis

Anjali Srivastava, Brianne Heisinger, Vaibhav Sinha, Hyong-Koo Lee, Xin Liu, Mingliang Qu, Xinhui Duan, Shuai Leng, Cynthia McCollough

Proceedings Volume 9033, 90335R (2014) https://doi.org/10.1117/12.2043733

KEYWORDS: Renal calculi, Molybdenum, Germanium, Selenium, Strontium, Zirconium, Bromine, Copper, Niobium, Kidney

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Proceedings Article | 7 June 2013 Paper

Construction of a ultrananocrystalline diamond-based cold cathode arrays for a flat-panel x-ray source

E. Grant, C. Posada, R. Divan, A. Sumant, D. Rosenmann, L. Stan, A. Avachat, C. Castano, H. Lee

Proceedings Volume 8709, 87090U (2013) https://doi.org/10.1117/12.2015846

KEYWORDS: Copper, Finite element methods, Tungsten, X-ray sources, Prototyping, Etching, Silica, Transmission electron microscopy, Photomasks, X-rays

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Proceedings Article | 29 May 2013 Paper

Feasibility studies on explosive detection and homeland security applications using a neutron and x-ray combined computed tomography system

V. Sinha, A. Srivastava, H. Lee, X. Liu

Proceedings Volume 8710, 87100W (2013) https://doi.org/10.1117/12.2017988

KEYWORDS: X-ray imaging, X-rays, Explosives detection, Image fusion, Homeland security, Sensors, Explosives, Expectation maximization algorithms, Imaging systems, X-ray detectors

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The successful creation and operation of a neutron and X-ray combined computed tomography (NXCT) system has been demonstrated by researchers at the Missouri University of Science and Technology. The NXCT system has numerous applications in the field of material characterization and object identification in materials with a mixture of atomic numbers represented. Presently, the feasibility studies have been performed for explosive detection and homeland security applications, particularly in concealed material detection and determination of the light atomic number materials. These materials cannot be detected using traditional X-ray imaging. The new system has the capability to provide complete structural and compositional information due to the complementary nature of X-ray and neutron interactions with materials. The design of the NXCT system facilitates simultaneous and instantaneous imaging operation, promising enhanced detection capabilities of explosive materials, low atomic number materials and illicit materials for homeland security applications. In addition, a sample positioning system allowing the user to remotely and automatically manipulate the sample makes the system viable for commercial applications. Several explosives and weapon simulants have been imaged and the results are provided. The fusion algorithms which combine the data from the neutron and X-ray imaging produce superior images. This paper is a compete overview of the NXCT system for feasibility studies of explosive detection and homeland security applications. The design of the system, operation, algorithm development, and detection schemes are provided.

This is the first combined neutron and X-ray computed tomography system in operation. Furthermore, the method of fusing neutron and X-ray images together is a new approach which provides high contrast images of the desired object. The system could serve as a standardized tool in nondestructive testing of many applications, especially in explosives detection and homeland security research.

Proceedings Article | 11 April 2013 Paper

Performance evaluation of a combined neutron and x-ray digital imaging system

V. Sinha, A. Srivastava, H. Lee, X. Liu

Proceedings Volume 8694, 86940R (2013) https://doi.org/10.1117/12.2009931

KEYWORDS: X-ray imaging, Imaging systems, Sensors, Modulation transfer functions, X-rays, Microchannel plates, Digital imaging, Image quality, Spatial frequencies, Digital x-ray imaging

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Proceedings Article | 6 March 2013 Paper

Monte Carlo simulation of bowtie filter scatter on a wide-cone low-dose CT system

Xin Liu, Anjali Srivastava, Hyoung-Koo Lee, Jiang Hsieh

Proceedings Volume 8668, 86685W (2013) https://doi.org/10.1117/12.2006618

KEYWORDS: Monte Carlo methods, X-rays, Optical filters, Image filtering, X-ray computed tomography, Sensors, Aluminum, Scanners, Photon transport, X-ray detectors

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Proceedings Article | 14 February 2013 Paper

Multiscale based adaptive contrast enhancement

Muhammad Abir, Fahima Islam, Daniel Wachs, Hyoung Lee

Proceedings Volume 8657, 86570X (2013) https://doi.org/10.1117/12.2005567

KEYWORDS: Breast, Mammography, Image filtering, Nonlinear filtering, X-rays, Image contrast enhancement, Image resolution, Image processing, Tissues, Digital filtering

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Proceedings Article | 17 March 2011 Paper

Electron field emission Particle-In-Cell (PIC) coupled with MCNPX simulation of a CNT-based flat-panel x-ray source

Edwin Grant, Chrystian Posada, Carlos Castaño, Hyoung Lee

Proceedings Volume 7961, 796108 (2011) https://doi.org/10.1117/12.878292

KEYWORDS: X-rays, Monte Carlo methods, X-ray sources, Tungsten, Electron beams, Rhodium, Photonic integrated circuits, Molybdenum, X-ray imaging, Electrodes

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Proceedings Article | 14 March 2009 Paper

Quasi-monochromatic x-ray filter with thin film multilayer for a large area radiation field

Youngsei Park, Sejin Han, Jangyeol Chae, Changkyu Kim, Kwon Chon, Hyoung-Koo Lee, D. Han

Proceedings Volume 7258, 72583L (2009) https://doi.org/10.1117/12.811537

KEYWORDS: X-rays, Reflectors, X-ray imaging, Polymethylmethacrylate, Optical filters, Aluminum, Thin films, Image filtering, Multilayers, X-ray sources

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Proceedings Article | 20 April 2005 Paper

An iterative method for flat-field correction of digital radiography when detector is at any position

Hyoung-Koo Lee, Do-Il Kim, Sung-Hyeon Kim, Dae-Sop Park, Bo-Young Choe, Tae-Suk Suh

Proceedings Volume 5745, (2005) https://doi.org/10.1117/12.595394

KEYWORDS: Sensors, X-ray detectors, X-rays, X-ray imaging, Nonuniformity corrections, Iterative methods, Detection and tracking algorithms, X-ray sources, Radiography, Solids

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Proceedings Article | 1 May 1994 Paper

Hydrogenated amorphous silicon (a-Si:H) based gamma camera--Monte Carlo simulations

Hyoung-Koo Lee, John Drewery, Wan Hong, Tao Jing, Selig Kaplan, Ali Mireshghi, Victor Perez-Mendez

Proceedings Volume 2163, (1994) https://doi.org/10.1117/12.174282

KEYWORDS: Cameras, Point spread functions, Device simulation, Medical imaging, Image restoration, Monte Carlo methods, Scattering, Photodetectors, Collimators, Photodiodes

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Showing 5 of 11 publications

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