Prof. Okkyun Lee Profile

Prof. Okkyun Lee

Assistant Professor at Daegu Gyeongbuk Institute of Science & Technology

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 18 October 2022 Open Access

Deep learning-based prior toward normalized metal artifact reduction in computed tomography

Jeonghyeon Nam, Dong Hye Ye, Okkyun Lee

Proceedings Volume 12304, 1230434 (2022) https://doi.org/10.1117/12.2646436

KEYWORDS: Computed tomography, X-ray computed tomography, Image processing, X-rays, X-ray detectors

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 18 October 2022 Open Access

Likelihood-based bilateral filtration in material decomposition for photon counting CT

Okkyun Lee

Proceedings Volume 12304, 123040X (2022) https://doi.org/10.1117/12.2647049

KEYWORDS: Computed tomography, Statistical analysis, Spatial resolution, Photon counting, Image filtering, Gaussian filters, X-ray computed tomography, Signal attenuation

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 18 October 2022 Open Access

Iodine-enhanced liver vessel segmentation in photon counting detector-based computed tomography using deep learning

Sumin Baek, Okkyun Lee, Donghye Ye

Proceedings Volume 12304, 1230432 (2022) https://doi.org/10.1117/12.2646541

KEYWORDS: Liver, Image segmentation, Iodine, X-ray computed tomography, Computed tomography, Photon counting, 3D image processing, Image processing, Machine learning, Volume segmentation

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 9 March 2018 Paper

Spatio-energetic cross-talk in photon counting detectors: N×N binning and sub-pixel masking

Katsuyuki Taguchi, Karl Stierstorfer, Christoph Polster, Okkyun Lee, Steffen Kappler

Proceedings Volume 10573, 105734X (2018) https://doi.org/10.1117/12.2293885

KEYWORDS: Photon counting, Sensors, X-rays, Data modeling, Visibility, Tissues, Distortion, X-ray computed tomography, Tissue optics, Image quality

Read Abstract +

Proceedings Article | 9 March 2018 Paper

Spatio-energetic cross-talk in photon counting detectors: numerical detector model (PcTK) and workflow for CT image quality assessment

Katsuyuki Taguchi, Karl Stierstorfer, Christoph Polster, Okkyun Lee, Steffen Kappler

Proceedings Volume 10573, 1057310 (2018) https://doi.org/10.1117/12.2293881

KEYWORDS: Image quality, X-rays, Sensors, Process modeling, X-ray computed tomography, Photon counting, Systems modeling, 3D modeling, Computed tomography

Read Abstract +

Proceedings Article | 9 March 2017 Paper

Projection-based motion estimation for cardiac functional analysis with high temporal resolution: a proof-of-concept study with digital phantom experiment

Yuki Suzuki, George S. Fung, Zeyang Shen, Yoshito Otake, Okkyun Lee, Luisa Ciuffo, Hiroshi Ashikaga, Yoshinobu Sato, Katsuyuki Taguchi

Proceedings Volume 10132, 1013230 (2017) https://doi.org/10.1117/12.2254723

KEYWORDS: X-ray computed tomography, Heart, Medical imaging, Error analysis, Motion estimation, Motion analysis, Functional analysis, Temporal resolution, Image registration, Statistical analysis, Image resolution, 3D image processing, Image quality, Image restoration

Read Abstract +

Proceedings Article | 9 March 2017 Paper

A study of modeling x-ray transmittance for material decomposition without contrast agents

Okkyun Lee, Steffen Kappler, Christoph Polster, Katsuyuki Taguchi

Proceedings Volume 10132, 101323G (2017) https://doi.org/10.1117/12.2254688

KEYWORDS: X-rays, Transmittance, X-ray detectors, Photon counting, Sensors, Performance modeling, Computed tomography, Algorithm development, Bone, Medicine

Read Abstract +

Proceedings Article | 9 March 2017 Presentation + Paper

Estimating basis line-integrals in spectral distortion-modeled photon counting CT: K-edge imaging using dictionary learning-based x-ray transmittance modeling

Okkyun Lee, Steffen Kappler, Christoph Polster, Katsuyuki Taguchi

Proceedings Volume 10132, 101321A (2017) https://doi.org/10.1117/12.2254663

KEYWORDS: X-rays, Transmittance, Photon counting, Algorithm development, X-ray computed tomography, X-ray detectors, X-ray imaging, Sensors, Data modeling, Gadolinium, Bone

Read Abstract +

Proceedings Article | 9 March 2017 Presentation + Paper

False dyssynchrony: problem with image-based cardiac functional analysis using x-ray computed tomography

Masafumi Kidoh, Zeyang Shen, Yuki Suzuki, Luisa Ciuffo, Hiroshi Ashikaga, George S. Fung, Yoshito Otake, Stefan Zimmerman, Joao A. Lima, Takahiro Higuchi, Okkyun Lee, Yoshinobu Sato, Lewis Becker, Elliot Fishman, Katsuyuki Taguchi

Proceedings Volume 10132, 101321U (2017) https://doi.org/10.1117/12.2250257

KEYWORDS: X-ray computed tomography, Functional analysis, Heart, Computed tomography, Motion estimation, CT reconstruction, Magnetic resonance imaging, Temporal resolution, Reconstruction algorithms

Read Abstract +

Proceedings Article | 31 March 2016 Paper

Beam hardening and motion artifacts in cardiac CT: evaluation and iterative correction method

Zeyang Shen, Okkyun Lee, Katsuyuki Taguchi

Proceedings Volume 9783, 978336 (2016) https://doi.org/10.1117/12.2217150

KEYWORDS: X-ray imaging, X-rays, Computed tomography, Defect detection, Data acquisition, Image filtering, Iodine, Iterative methods, Image quality, Image restoration, Image segmentation, Heart, X-ray computed tomography

Read Abstract +

Proceedings Article | 25 March 2016 Paper

Spatio-energetic cross-talks in photon counting detectors: detector model and correlated Poisson data generator

Katsuyuki Taguchi, Christoph Polster, Okkyun Lee, Steffen Kappler

Proceedings Volume 9783, 97831R (2016) https://doi.org/10.1117/12.2217133

KEYWORDS: Photon counting, Sensors, Data modeling, X-rays, Monte Carlo methods, Luminescence, Photoelectric effect, X-ray fluorescence spectroscopy, X-ray detectors, Clouds

Read Abstract +

Proceedings Article | 21 September 2015 Paper

Joint sparse recovery in inverse scattering

Okkyun Lee, Jong Chul Ye

Proceedings Volume 9600, 96000C (2015) https://doi.org/10.1117/12.2188764

KEYWORDS: Inverse scattering, Inverse scattering problem, Optical tomography, Electroluminescent displays, Tomography, Scattering, Biomedical optics, Reconstruction algorithms, Tissues, Tissue optics

Read Abstract +

Proceedings Article | 27 September 2011 Paper

Coherent source imaging and dynamic support tracking for inverse scattering using compressive MUSIC

Okkyun Lee, Jong Min Kim, Jaejoon Yoo, Kyunghwan Jin, Jong Chul Ye

Proceedings Volume 8138, 81380G (2011) https://doi.org/10.1117/12.893457

KEYWORDS: Coherence imaging, Detection and tracking algorithms, Inverse scattering, Algorithm development, Compressed sensing, Inverse scattering problem, Reconstruction algorithms, Magnetoencephalography, Signal processing, Scattering

Read Abstract +

Showing 5 of 13 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years