Mr. Pil-Hyun Jeon Profile

Pil-Hyun Jeon

at Yonsei Univ

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Publications (6)

Proceedings Article | 1 June 2020 Paper

Noise reduction in direct multi-material decomposition for dual-energy CT

Haenghwa Lee, Dong-Hoon Lee, Pil-Hyun Jeon, Zhen Chao, Hee-Joung Kim

Proceedings Volume 11515, 115150B (2020) https://doi.org/10.1117/12.2566354

KEYWORDS: Bone, Denoising, X-ray computed tomography, Minerals, Tissues, Reconstruction algorithms, Neodymium, Dual energy imaging, Tomography, X-ray sources

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Proceedings Article | 27 March 2019 Paper

Comparison study of image quality between filtered back projection and iterative reconstruction algorithm for dose reduction in chest CT

Junyoung Son, Donghoon Lee, Pil-Hyun Jeon, Sunghoon Choi, Hyemi Kim, Hee-Joung Kim

Proceedings Volume 11050, 110500B (2019) https://doi.org/10.1117/12.2521248

KEYWORDS: Reconstruction algorithms, Image quality, Infrared imaging, Computed tomography, Image filtering, Infrared radiation, Chest, Optical filters, Detection and tracking algorithms, Radiology

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Proceedings Article | 22 March 2016 Paper

Optimization of exposure parameters in digital tomosynthesis considering effective dose and image quality

Seungyeon Choi, Sunghoon Choi, Ye-seul Kim, Haenghwa Lee, Donghoon Lee, Pil-Hyun Jeon, Dong-Hyuk Jang, Hee-Joung Kim

Proceedings Volume 9783, 978368 (2016) https://doi.org/10.1117/12.2216484

KEYWORDS: Image quality, Chest, Interference (communication), Imaging systems, Signal to noise ratio, Arteries, Quality systems, Computing systems, Computed tomography, Image resolution, Ions, X-rays, Radiography

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Proceedings Article | 18 March 2015 Paper

Evaluation of imaging characteristics in CTDI phantom size on contrast imaging

Pil-Hyun Jeon, Won-Hyung Lee, Seong-Su Jeon, Hee-Joung Kim

Proceedings Volume 9412, 94124J (2015) https://doi.org/10.1117/12.2082251

KEYWORDS: Iodine, Calcium, Image quality, Polymethylmethacrylate, Computed tomography, Diagnostics, Image analysis, X-ray computed tomography, Photons, Bone

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Proceedings Article | 31 March 2014 Paper

Scatter correction method with primary modulator for dual energy digital radiography: a preliminary study

Byung-Du Jo, Young-Jin Lee, Dae-Hong Kim, Pil-Hyun Jeon, Hee-Joung Kim

Proceedings Volume 9033, 90335U (2014) https://doi.org/10.1117/12.2043016

KEYWORDS: Modulators, Dual energy imaging, Aluminum, Modulation, Monte Carlo methods, Polymethylmethacrylate, Radiography, Image quality, X-rays, Imaging systems

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In conventional digital radiography (DR) using a dual energy subtraction technique, a significant fraction of the detected photons are scattered within the body, resulting in the scatter component. Scattered radiation can significantly deteriorate image quality in diagnostic X-ray imaging systems. Various methods of scatter correction, including both measurement and non-measurement-based methods have been proposed in the past. Both methods can reduce scatter artifacts in images. However, non-measurement-based methods require a homogeneous object and have insufficient scatter component correction. Therefore, we employed a measurement-based method to correct for the scatter component of inhomogeneous objects from dual energy DR (DEDR) images. We performed a simulation study using a Monte Carlo simulation with a primary modulator, which is a measurement-based method for the DEDR system. The primary modulator, which has a checkerboard pattern, was used to modulate primary radiation. Cylindrical phantoms of variable size were used to quantify imaging performance. For scatter estimation, we used Discrete Fourier Transform filtering. The primary modulation method was evaluated using a cylindrical phantom in the DEDR system. The scatter components were accurately removed using a primary modulator. When the results acquired with scatter correction and without correction were compared, the average contrast-to-noise ratio (CNR) with the correction was 1.35 times higher than that obtained without correction, and the average root mean square error (RMSE) with the correction was 38.00% better than that without correction. In the subtraction study, the average CNR with correction was 2.04 (aluminum subtraction) and 1.38 (polymethyl methacrylate (PMMA) subtraction) times higher than that obtained without the correction. The analysis demonstrated the accuracy of scatter correction and the improvement of image quality using a primary modulator and showed the feasibility of introducing the primary modulation technique into dual energy subtraction. Therefore, we suggest that the scatter correction method with a primary modulator is useful for the DEDR system.

Proceedings Article | 6 March 2013 Paper

Evaluation of reconstructed images from sparse data on the micro-CT system

Dae-Hong Kim, Hee-Joung Kim, Pil-Hyun Jeon

Proceedings Volume 8668, 86683K (2013) https://doi.org/10.1117/12.2007866

KEYWORDS: Reconstruction algorithms, Iodine, X-ray computed tomography, Data acquisition, Imaging systems, Image quality, X-rays, Image filtering, Sensors, Medical imaging

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Showing 5 of 6 publications

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