Search Results - "Kim, Guna"

Super-spatial resolution method combined with the maximum-likelihood expectation maximization (MLEM) algorithm for alpha imaging detector by Kim, Guna, Lim, Ilhan, Song, Kanghyon, Kim, Jong-Guk

“…Recently, the demand for alpha imaging detectors for quantifying the distributions of alpha particles has increased in various fields. This study aims to…”
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Super-spatial resolution method combined with the maximum-likelihood expectation maximization (MLEM) algorithm for alpha imaging detector by Kim, Guna, Lim, Ilhan, Song, Kanghyon, Kim, Jong-Guk

“…Recently, the demand for alpha imaging detectors for quantifying the distributions of alpha particles has increased in various fields. This study aims to…”
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Feasibility study of deep-learning-based bone suppression incorporated with single-energy material decomposition technique in chest X-rays by Lim, Younghwan, Lee, Minjae, Cho, Hyosung, Kim, Guna, Choi, Jaegu, Cha, Bokyung, Kim, Sunkwon

“…To improve the detection of lung abnormalities in chest X-rays by accurately suppressing overlapping bone structures in the lung area. According to literature…”
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Feasibility Study of an Improved Single-Energy Material Decomposition Method for Computed Tomography by Kim, Guna, Park, Soyoung, Lim, Ilhan, Song, Kanghyon, Kim, Jong-Guk

“…Computed tomography (CT) scan that uses two distinct X-ray spectra in measurement allows for a dual-energy material decomposition (DEMD). DEMD performs…”
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Dual-isotope imaging method for Actinium-225 and Bismuth-213 using alpha imaging detector by Kim, Jong-Guk, Kim, Guna, Lee, Hyun Su, Kim, Byoungsoo, Lim, Il-Han, Kim, Kwangil, Lee, Kyochul

“…Recently, 225Ac has received considerable attention for its use in targeted alpha therapy because it has a relatively long half-life and yields four more…”
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Performance evaluation of compact input function measurement device for small animal PET by Kim, Jong-Guk, Kim, Guna, Kim, Byoung Soo, Kim, Kyeong Min, Lee, Kyo Chul

“…The aim of this study is to evaluate performance on developed compact blood input function measurement system for small-animal position emission tomography…”
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An X-ray spectrum estimation method from transmission measurement combined with scatter correction by Kim, Guna, Cho, Hyosung, Lim, Ilhan, Song, Kanghyon, Kim, Jong-Guk

“…•This study aims to apply the scatter correction in x-ray spectrum estimation.•Unknown x-ray spectrum can be successfully estimated using the proposed…”
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Evaluation of the image quality in digital breast tomosynthesis (DBT) employed with a compressed-sensing (CS)-based reconstruction algorithm by using the mammographic accreditation phantom by Park, Yeonok, Cho, Heemoon, Je, Uikyu, Cho, Hyosung, Park, Chulkyu, Lim, Hyunwoo, Kim, Kyuseok, Kim, Guna, Park, Soyoung, Woo, Taeho, Choi, Sungil

“…In this work, we have developed a prototype digital breast tomosynthesis (DBT) system which mainly consists of an x-ray generator (28kVp, 7mAs), a CMOS-type…”
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Dynamically-Collimated Digital Tomosynthesis Reconstruction by Using a Compressed-Sensing Based Algorithm by Park, Soyoung, Kim, Guna, Cho, Hyosung, Seo, Changwoo, Lee, Minsik

“…Conventional digital tomosynthesis (DTS) reconstruction by using the filtered-backprojection algorithm requires a full field-of-view scan and relatively dense…”
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Image reconstruction in region-of-interest (or interior) digital tomosynthesis (DTS) based on compressed-sensing (CS) by Park, Soyoung, Kim, Guna, Cho, Hyosung, Je, Uikyu, Park, Chulkyu, Kim, Kyuseok, Lim, Hyunwoo, Lee, Dongyeon, Lee, Hunwoo, Kang, Seokyoon, Park, Jeongeun, Woo, Taeho, Lee, Minsik

“…•A new type of digital tomosynthesis (DTS) examination was introduced.•DTS region-of-interest (ROI) reconstruction requires less radiation dose.•A CS-based…”
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Single-Energy Material Decomposition in Radiography Using a Three-Dimensional Laser Scanner by Kim, Guna, Lim, Younghwan, Park, Jeongeun, Kim, Woosung, Lee, Dongyeon, Cho, Hyosung, Park, Chulkyu, Kang, Seokyoon, Kim, Kyuseok, Park, Soyoung, Lim, Hyunwoo, Lee, Hunwoo, Jeon, Duhee

“…We investigated an efficient method for material decomposition in radiography, which can separate soft tissues and bones from a single radiograph with the aid…”
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Projection-based dual-energy digital tomosynthesis and its image characteristics by Kim, Guna, Park, Soyoung, Park, Chulkyu, Kang, Seokyoon, Kim, Kyuseok, Cho, Hyosung, Park, Jeongeun, Lim, Younghwan, Lee, Dongyeon, Lim, Hyunwoo, Lee, Hunwoo, Jeon, Duhee, Kim, Woosung, Seo, Changwoo

“…Digital tomosynthesis (DTS) images reconstructed from the limited-angle scanned projections are often limited in image performance due mainly to superimposed…”
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Improvement of image characteristics in high-voltage computed tomography (CT) by applying a compressed-sensing (CS)-based image deblurring scheme by Kim, Kyuseok, Cho, Hyosung, Je, Uikyu, Park, Chulkyu, Lim, Hyunwoo, Kim, Guna, Park, Soyoung, Park, Yeonok, Lee, Dongyeon, Lee, Hunwoo, Woo, Taeho

“…We have established a high-voltage computed tomography (CT) system with a 1–3MV LINAC x-ray generator for industrial nondestructive testing. However,…”
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Four-Dimensional CBCT Reconstruction Based on a Residual Convolutional Neural Network for Improving Image Quality by Lee, Dongyeon, Kim, Kyuseok, Kim, Woosung, Kang, Seokyoon, Park, Chulkyu, Cho, Hyosung, Lim, Younghwan, Kim, Guna, Park, Soyoung, Lim, Hyunwoo, Lee, Hunwoo, Jeon, Duhee, Park, Jeongeun, Seo, Changwoo, Lee, Minsik

“…In radiation treatment, a cone-beam computed tomography (CBCT) scan is conducted for precise positioning of tumors, and the image quality is usually degraded…”
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A New Voxelization Strategy in Compressed-Sensing (CS)-Based Iterative CT Reconstruction for Reducing Computational Cost: Simulation and Experimental Studies by Kim, Guna, Park, Soyoung, Je, Uikyu, Cho, Hyosung, Park, Chulkyu, Kim, Kyuseok, Lim, Hyunwoo, Lee, Dongyeon, Lee, Hunwoo, Park, Yeonok, Woo, Taeho

“…In recent computed tomography (CT) reconstruction, iterative methods have been often used owing to the potential to provide three-dimensional (3D) images of…”
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Model-Based Noise Reduction in Scatter Correction Using a Deep Convolutional Neural Network for Radiography by Kim, Kyuseok, Kim, Woosoung, Kang, Seokyoon, Lee, Dongyeon, Cho, Hyosung, Kim, Guna, Park, Soyoung, Lim, Younghwan, Park, Chulkyu, Park, Jeongeun, Lim, Hyunwoo, Lee, Hunwoo, Jeon, Duhee, Seo, Changwoo

“…In radiography, scattered X-rays cause contrast loss in X-ray images, limiting their clinical usefulness, and are often reduced using several scatter…”
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Soft-compression Mammography Based on Weighted l 1-norm Scatter Correction Scheme for Reducing Patient Pain during Breast Examination by Kang, Seokyoon, Kyuseok Kim, Kim, Woosung, Cho, Hyosung, Seo, Changwoo, Park, Chulkyu, Lee, Dongyeon, Park, Soyoung, Kim, Guna, Lim, Hyunwoo, Lee, Hunwoo, Park, Jeongeun, Doohee Jean, Oh, Jieun

“…In mammography examination, compression of the breast is essential for reducing scattered X-rays and the radiation dose and for preventing motion artifacts,…”
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Industrial x-ray inspection system with improved image characterization using blind deblurring based on compressed-sensing scheme by Kim, Kyuseok, Park, Soyoung, Kim, Guna, Cho, Hyosung, Je, Uikyu, Park, Chulkyu, Lim, Hyunwoo, Lee, Hunwoo, Lee, Dongyeon, Park, Yeonok, Woo, Taeho

“…An industrial x-ray inspection system has recently established by our group to examine large and dense objects available in industry. It consists of an…”
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Investigation of image characteristics in phase-contrast X-Ray imaging (PCXI)) using a conventional X-Ray grid by Lim, Hyunwoo, Lee, Hunwoo, Cho, Hyosung, Seo, Changwoo, Je, Uikyu, Park, Chulkyu, Kim, Kyuseok, Kim, Guna, Park, Soyoung, Lee, Dongyeon, Kang, Seokyoon, Lee, Minsik

“…Phase-contrast x-ray imaging (PCXI) is an emerging technology which allows for imaging of smaller features in the examined sample than conventional…”
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Indirect measurement of high grid strip densities over Nyquist sampling rate based on the moiré pattern analysis for quality assurance in grid manufacturing by Je, Uikyu, Kim, Jinsoo, Cho, Hyosung, Lim, Hyunwoo, Park, Chulkyu, Kim, Guna, Park, Soyoung, Park, Yeonok, Kim, Kyuseok, Woo, Taeho, Chung, Nagkun, Kim, Jinwon, Kim, Jinguk

“…•Highly precise carbon-interspaced antiscatter grids have been studied.•Actual grid strip densities over the Nyquist sampling rate are indirectly measured…”
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