Prof. Hyung Ham Kim Profile

Prof. Hyung Ham Kim

Professor at Pohang Univ of Science and Technology

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 12 March 2024 Presentation + Paper

A highly sensitive and wideband transparent ultrasound transducer designed for advanced in vivo ultrasound and photoacoustic imaging

Seonghee Cho, Minsu Kim, Joongho Ahn, Jeongwoo Park, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 12842, 1284203 (2024) https://doi.org/10.1117/12.3002160

KEYWORDS: Ultrasound transducers, Acoustics, Ultrasonography, Photoacoustic imaging, In vivo imaging, Visualization, Transmittance

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Proceedings Article | 12 March 2024 Presentation + Paper

High-resolution label-free ultraviolet photoacoustic microscopy via an ultraviolet-transparent ultrasound transducer

Donggyu Kim, Eunwoo Park, Jeongwoo Park, Bjarne Perleberg, Sora Jeon, Joongho Ahn, Mingyu Ha, Hyung Ham Kim, Jin Young Kim, Chan Kwon Jung, Chulhong Kim

Proceedings Volume 12842, 1284205 (2024) https://doi.org/10.1117/12.3000818

KEYWORDS: Histopathology, Ultrasound transducers, Photoacoustic microscopy, Photoacoustic imaging

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Proceedings Article | 9 March 2023 Presentation + Paper

High-resolution photoacoustic and ultrasound endoscope based on the transparent ultrasound transducer

Jaewoo Kim, Dasom Heo, Jeongwoo Park, Seonghee Cho, Joongho Ahn, Jongbeom Kim, Mingyu Ha, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 12379, 1237905 (2023) https://doi.org/10.1117/12.2650804

KEYWORDS: Acoustics, Ultrasound transducers, Ultrasonography, Biomedical optics, Vagina, Rectum, Transducers, Photoacoustic spectroscopy, Optical alignment, GRIN lenses

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Proceedings Article | 9 March 2023 Poster + Paper

Tapered fiber-based shear force scanning photoacoustic microscopy

Moongyu Han, Byullee Park, Hongyoon Kim, Jinhee Yoo, Dong Kyo Oh, Seongwon Moon, Joongho Ahn, Hae Gyun Lim, Inki Kim, Hyung Ham Kim, Junsuk Rho, Chulhong Kim

Proceedings Volume 12379, 123791H (2023) https://doi.org/10.1117/12.2648171

KEYWORDS: Gold, Near field, Glasses, Photoacoustic microscopy, Aluminum, Photoacoustic spectroscopy, Near field optics, Image resolution, Wave propagation, Ultrasonography

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Proceedings Article | 9 March 2023 Poster + Paper

Integrated wearable and mobile ultrasound and photoplethysmography device via transparent ultrasound transducer

Jeongwoo Park, Byullee Park, Donggyu Kim, Joongho Ahn, Jin Young Kim, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 12379, 123791G (2023) https://doi.org/10.1117/12.2648164

KEYWORDS: Sensors, Wearable devices, Ultrasound transducers, Ultrasonography, Light emitting diodes, Heart, Signal detection, Mobile devices, Photoplethysmography, Oxygen

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Proceedings Article | 9 March 2023 Poster + Paper

Photoacoustic-only preamplification in simultaneous photoacoustic and ultrasound imaging using switchable preamplifier

Donghyeon Oh, Jinhee Yoo, Jiyong Um, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 12379, 123791D (2023) https://doi.org/10.1117/12.2648110

KEYWORDS: Photoacoustic spectroscopy, Photoacoustic imaging, Signal to noise ratio, Circuit switching, Imaging systems, In vivo imaging

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Sharing the same acoustic imaging principle, photoacoustic (PA) imaging is available to be done simultaneously with ultrasound (US) imaging, while still discrepancy between two modalities exists as PA imaging relatively suffers with higher depth attenuation and low signal contrast compared to the US imaging. In order to balance the PA to the level of US, we designed an application-specific integrated circuit (ASIC) preamplifier built in with selective switching protocol to amplify only the PA signal. The preamplifier accepts two distinct triggers: synchronized to the Q-switch trigger given with actual beam emission, preamplifier switches and amplifies the PA signal with customized gain. On the other hand, within the flashlamp trigger given before the Q-switch trigger (approx. 300 μs), the preamp is switched off and the US acquisition bypasses amplification. The preamp affords single channel, and we implemented the designed preamplifier to the acoustic-resolution 3D PAUS scanner installed with 5-MHz single-element focused transducer. The signal-to-noise ratio (SNR) and according penetration depth enhancement was well validated by imaging both carbon leads and wire phantoms under optically turbid media (5% diluted milk), measured to be ~ 16.8 dB at 25 mm and 10.6 dB at 33.7 mm, respectively. To fully demonstrate the improvement of PA images under practical circumstance, the bimodal whole-body image of a healthy anesthetized nude Balb/c mouse was acquired with and without the preamplifier. As a result, the organs (spleen, liver, cecum) and vasculatures lying down in the deeper region were unveiled from preamplifier-applied PA images. Above all, our proposed switchable preamplifier well preserved PA signal of weak level against sequentially acquired with high intensity US signals, extending the penetration depth and increasing the PA image contrast. Further extension toward multichannel application would be helpful to translate array US transducer-based simultaneous PA/US imaging toward clinical practice.

Proceedings Article | 3 March 2022 Paper

High-resolution, high-speed photoacoustic microscopy and photoplethysmography for clinical applications in human fingers

Joongho Ahn, Jinwoo Baik, Hyojin Kim, Yeonggeun Kim, Jin Young Kim, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 11960, 119600H (2022) https://doi.org/10.1117/12.2608377

KEYWORDS: Blood vessels, Heart, Imaging systems, Photoplethysmography, In vivo imaging, Photoacoustic microscopy

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Proceedings Article | 9 December 2021 Paper

Multimodal preclinical imaging system using transparent ultrasonic transducer

Jeongwoo Park, Byullee Park, Tae Yeong Kim, Sungjin Jung, Woo June Choi, Joongho Ahn, Uijung Yong, Jinah Jang, Won Jong Kim, Hong Kyun Kim, Unyong Jeong, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 11923, 119230I (2021) https://doi.org/10.1117/12.2615887

KEYWORDS: Imaging systems, Optical coherence tomography, Multimodal imaging, Transducers, Ultrasonography, Ultrasonics, Preclinical imaging, Skin, System integration, Optical imaging

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Proceedings Article | 9 March 2021 Presentation + Paper

Seamlessly integrated multi-modal imaging system through transparent ultrasound transducer in vivo

Jeongwoo Park, Byullee Park, Seungwan Jeon, Tae Yeong Kim, Dong Hee Yoon, Hongkyun Kim, Donghyun Lee, Uijung Yong, Jinah Jang, Unyong Jeong, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 11642, 116420B (2021) https://doi.org/10.1117/12.2577208

KEYWORDS: Imaging systems, Ultrasonography, Transducers, Multimodal imaging, System integration, Optical coherence tomography, Injuries, In vivo imaging, Optical imaging, Ultrasonics

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Continuous blood flow monitoring using patch-type array transducer and portable ultrasound imaging system

Kyungmin Kim, Miji Kim, Yeonseong Park, Hae Gyun Lim, Changhan Yoon, Hyung Ham Kim

Proceedings Volume 11602, 116021B (2021) https://doi.org/10.1117/12.2582071

KEYWORDS: Ultrasonography, Imaging systems, Transducers, Blood circulation, Doppler effect, Arteries, Safety, Real time imaging, Neck

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Frequency-dependent calcium dynamics in ultrasound mechanotransduction

Jinhee Yoo, Hae Gyun Lim, Hyung Ham Kim

Proceedings Volume 11602, 116021E (2021) https://doi.org/10.1117/12.2581558

KEYWORDS: Ultrasonography, Calcium, Transducers, Tissues, Cell mechanics, Cancer, Calibration, Alzheimer's disease

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Proceedings Article | 17 February 2020 Paper

Seamlessly integrated optical and acoustical imaging systems through transparent ultrasonic transducer

Jeongwoo Park, Byullee Park, Taeyeong Kim, Donghyun Lee, Uijung Yong, Jinah Jang, Unyong Jeong, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 11240, 112401P (2020) https://doi.org/10.1117/12.2544037

KEYWORDS: Signal detection, Transducers, Imaging systems, Ultrasonography, Ear, Ultrasonics, Optical sensors, In vivo imaging, Photoacoustic spectroscopy, Transparency

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Proceedings Article | 27 February 2019 Paper

Sub-wavelength convertible Bessel-beam and Gaussian-beam photoacoustic microscope in reflection-mode for in-vivo application

Byullee Park, Hoyong Lee, Seungwan Jeon, Joongho Ahn, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 10878, 1087869 (2019) https://doi.org/10.1117/12.2506562

KEYWORDS: In vivo imaging, Imaging systems, Photoacoustic microscopy, Photoacoustic spectroscopy, Signal detection, Image resolution, Objectives, Ear, Carbon, Microscopes

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SPIE Journal Paper | 10 December 2015

High-frequency ultrasound imaging for breast cancer biopsy guidance

Thomas Cummins, Changhan Yoon, Hojong Choi, Payam Eliahoo, Hyung Ham Kim, Mary Yamashita, Linda Hovanessian-Larsen, Julie Lang, Stephen Sener, John Vallone, Sue Martin, K. Kirk Shung

JMI, Vol. 2, Issue 04, 047001, (December 2015) https://doi.org/10.1117/12.10.1117/1.JMI.2.4.047001

KEYWORDS: Ultrasonography, Biopsy, Tissues, Pathology, Breast, Breast cancer, Imaging systems, Visualization, Transducers, Cancer

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SPIE Journal Paper | 13 April 2015

Dual-element needle transducer for intravascular ultrasound imaging

Sangpil Yoon, Min Gon Kim, Jay Williams, Changhan Yoon, Bong Jin Kang, Nestor Cabrera-Munoz, K. Kirk Shung, Hyung Ham Kim

JMI, Vol. 2, Issue 02, 027001, (April 2015) https://doi.org/10.1117/12.10.1117/1.JMI.2.2.027001

KEYWORDS: Transducers, Tissues, Chemical elements, Intravascular ultrasound, Blood, Acoustics, Solids, Image resolution, Visualization, Natural surfaces

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Showing 5 of 15 publications

Conference Committee Involvement (11)