Mr. Jin Ho Choi Profile

Jin Ho Choi

at Kyung Hee University

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 7 April 2023 Poster + Paper

Operation of multi-beam compact tomosynthesis system using carbon nanotube emitters

Jinho Choi, Hanna Lee, Amar Prasad Gupta, Mrinal Bhusal Sharma, Jaekyu Jang, Jaeik Jung, Won Jung Lee, Seung Jun Yeo, Moonkyoo Kong, Jehwang Ryu

Proceedings Volume 12463, 124634I (2023) https://doi.org/10.1117/12.2655802

KEYWORDS: X-ray sources, Tomosynthesis, Anodes, Vacuum, X-rays, X-ray imaging, X-ray detectors, Electric fields, Carbon nanotubes

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Proceedings Article | 7 April 2023 Poster + Paper

Geometric comparison of chest tomosynthesis system with thermionic filament and carbon nanotube field emitter-based x-ray sources

Jinho Choi, Junho Yu, Hanna Lee, Amar Prasad Gupta, Mrinal Bhusal Sharma, Jaekyu Jang, Jaeik Jung, Won Jung Lee, Seung Jun Yeo, Moonkyoo Kong, Jehwang Ryu

Proceedings Volume 12463, 124634H (2023) https://doi.org/10.1117/12.2655799

KEYWORDS: X-ray sources, X-rays, Tomosynthesis, X-ray imaging, Chest, 3D image processing, Anodes, Motion blur, Carbon nanotubes, Dielectrophoresis

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Proceedings Article | 7 April 2023 Poster + Paper

Development of reflective type digital cell irradiation system based on carbon nanotube for biological research of low-dose radiation

Hanna Lee, Jinho Choi, Amar Prasad Gupta, Jaeik Jung, Jaekyu Jang, Kyung-Sik Yoon, Jehwang Ryu

Proceedings Volume 12463, 124634M (2023) https://doi.org/10.1117/12.2655840

KEYWORDS: Anodes, Electric fields, X-rays, Carbon nanotubes, Vacuum chambers, Scanning electron microscopy, Medicine, Field effect transistors, Dosimetry

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Proceedings Article | 7 April 2023 Poster + Paper

A comparison of digital-based CNT and analogue-based filament x-ray source in regard to intraoperative specimen x-ray system’s development

Amar Prasad Gupta, Taewon Kim, Mrinal Bhusal Sharma, Jinho Choi, Jaekyu Jang, Seung Jun Yeo, Jaeik Jung, Jeung Sun Ahn, Beom-Seok Ko, Jehwang Ryu

Proceedings Volume 12463, 124634F (2023) https://doi.org/10.1117/12.2655782

KEYWORDS: X-rays, X-ray sources, X-ray imaging, Windows, Mammography, Digital x-ray imaging, Breast, Computed tomography, Anodes, Vacuum chambers

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Proceedings Article | 4 April 2022 Poster + Paper

Development of 120 kV ceramic x-ray tube for dental imaging and its comparison with commercial glass x-ray tube

Jaekyu Jang, Amar Prasad Gupta, Keunhwa Park, Jinho Choi, Hanna Lee, Mrinal Bhusal Sharma, Deokwon Seo, Jaeik Jung, Seung Jun Yeo, Jeung Sun Ahn, Jehwang Ryu

Proceedings Volume 12031, 120314D (2022) https://doi.org/10.1117/12.2613461

KEYWORDS: X-rays, Ceramics, X-ray imaging, Glasses, Panoramic photography, Tungsten, Image resolution, X-ray detectors, X-ray characterization, Spatial resolution

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When designing an X-ray monoblock for portable systems, the size and compactness of X-ray tube plays an important role. The monoblocks normally contains high voltage unit and X-ray tube immersed together inside the sea of insulating oil and sealed by Aluminum or plastic frame. Normally, mononblocks built for 100 kV or higher X-ray tube are quite bulky, not because of the high voltage source unit but because of the huge size of glass enveloped X-ray tube. The compactness of X-ray tube can decrease the size of mononblock and it can subsequently increase the portability of X-ray system. There are efforts done to decrease the size of X-ray tube by replacing the glass envelope with metal ceramic frames in CT X-ray tubes which are categorized as Rotating X-ray tubes. However, there are few or almost no researches on looking for an alternative to avoid making bulky glass X-ray tubes for Stationary tubes. It might be partially because the discovery of Xray tubes is all connected to the glass vacuum tubes. Other reasons could be due to matureness of glass making technology, which though still lacks automation but is cheaper and easier. Our group has realized that using ceramic to maintain vacuum and use it as an alternative to glass envelop can increase the robustness and compactness of filament X-ray tubes. Moreover, it can also help engineers to develop smaller and lighter monoblock for high-end X-ray systems. Thus, in this study, we report a development of compact 120 kV ceramic-based filament type X-ray tube for panoramic dental imaging. We have compared in-house built ceramic X-ray tube with commercial glass X-ray tube which is most commonly used for 100 kV panoramic dental X-ray imaging system. The result shows that despite the 38 % reduction in size, ceramic tube has better IV characteristic with similar filament size and higher limiting spatial resolution compared to glass X-ray tube. Moreover, we have successfully performed all the X-ray experiments using 100 kV 500W custom built high voltage source which can be used for making monoblocks.

Proceedings Article | 4 April 2022 Poster + Paper

Effect of self-focusing gate structure length in CNT-based E-gun for intraoperative specimen radiographic system

Amar Prasad Gupta, Jinho Choi, Jaekyu Jang, Deokwon Seo, Mrinal Bhusal Sharma, Seung Jun Yeo, Jaeik Jung, Jeung Sun Ahn, Beom-Seok Ko, Jehwang Ryu

Proceedings Volume 12031, 120314F (2022) https://doi.org/10.1117/12.2613549

KEYWORDS: X-rays, X-ray sources, X-ray imaging, X-ray detectors, Digital imaging, Spatial resolution, Digital x-ray imaging, Ceramics, X-ray optics, Surgery

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Proceedings Article | 4 April 2022 Poster + Paper

Design of CNT-based electron microbeam cell irradiation system for low-dose radiobiology research

Hanna Lee, Jinho Choi, Amar Prasad Gupta, Jaeik Jung, Jaekyu Jang, Moonkyoo Kong, Yeong Heum Yeon, Moon Shik Chae, Byeong-No Lee, Shalini Rajpoot, Kyung-Sik Yoon, Jehwang Ryu

Proceedings Volume 12031, 120314I (2022) https://doi.org/10.1117/12.2613347

KEYWORDS: Radiation effects, Beryllium, 3D modeling, Scanning electron microscopy, Radiation oncology, Radiotherapy, Particles, Metals, Medicine, Medical research

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Proceedings Article | 4 April 2022 Poster + Paper

Compact x-ray tube based on carbon nanotube cold cathode emitter for handheld type x-ray application

Jongmin Lim, Amar Prasad Gupta, Jaeik Jung, Jaekyu Jang, Jinho Choi, Shalini Rajpoot, Seung Jun Yeo, Jeung Sun Ahn, Jehwang Ryu

Proceedings Volume 12031, 120314H (2022) https://doi.org/10.1117/12.2613310

KEYWORDS: X-rays, X-ray imaging, Teeth, Field effect transistors, Ceramics, Carbon nanotubes, Metals, Transformers, X-ray sources, Chemical vapor deposition

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

X-ray tube based on carbon nanotube field emitter for low dose mini C-arm fluoroscopy

Jongmin Lim, Amar P. Gupta, Hangyeol Park, Jinho Choi, Jaeik Jung, Jaekyu Jang, Seung Jun Yeo, Jeung Sun Ahn, Byeong-No Lee, Moon Shik Chae, Jehwang Ryu

Proceedings Volume 11595, 1159539 (2021) https://doi.org/10.1117/12.2582090

KEYWORDS: Fluoroscopy, X-rays, Carbon nanotubes, X-ray sources, Image acquisition, Carbon, X-ray imaging, Switching, Safety, Electrons

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Development of microfocus x-ray source based on CNT emitter for intraoperative specimen radiographic system

Amar Prasad Gupta, Seung Jun Yeo, Jaekyu Jang, Jaeik Jung, Jinho Choi, Jongmin Lim, Wooseob Kim, Junyoung Park, Hangyeol Park, Moon Shik Chae, Yeong Heum Yeon, Jeung Sun Ahn, Seung Hoon Kim, Namkug Kim, Beomseok Ko, Jehwang Ryu

Proceedings Volume 11595, 115953J (2021) https://doi.org/10.1117/12.2582087

KEYWORDS: X-ray sources, X-rays, Breast, Target detection, Chemical vapor deposition, Metals, Detector development, Carbon nanotubes

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Characterization of compact alumina vacuum sealed x-ray tube for medical imaging: interpretation with simulation program

Jinho Choi, Amar Prasad Gupta, Jaekyu Jang, Seung Jun Yeo, Jaeik Jung, Moon Shik Chae, Yeong Heum Yeon, Byeong-No Lee, Kyungmin Oh, Jeung Sun Ahn, Seung Hoon Kim, Hyung-Soo Mok, Moonkyoo Kong, Jehwang Ryu

Proceedings Volume 11595, 115953C (2021) https://doi.org/10.1117/12.2582295

KEYWORDS: X-rays, X-ray imaging, X-ray characterization, Medical imaging, Power supplies, Glasses, Ceramics, Breast

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