Mr. Younsu Kim Profile

Younsu Kim

at Johns Hopkins Univ

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Author

Publications (15)

Proceedings Article | 15 March 2019 Paper

Deep learning image reconstruction method for limited-angle ultrasound tomography in prostate cancer

Alexis Cheng, Younsu Kim, Emran M. Anas, Arman Rahmim, Emad Boctor, Reza Seifabadi, Bradford Wood

Proceedings Volume 10955, 1095516 (2019) https://doi.org/10.1117/12.2512533

KEYWORDS: Image restoration, Prostate, Ultrasound tomography, Prostate cancer, Image sensors, Biopsy, Sensors, Acoustics, Transducers, Magnetic resonance imaging

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Proceedings Article | 8 March 2019 Presentation + Paper

Enabling low-cost point-of-care ultrasound imaging system using single element transducer and delta configuration actuator

Keshuai Xu, Younsu Kim, Emad Boctor, Haichong Zhang

Proceedings Volume 10951, 109510W (2019) https://doi.org/10.1117/12.2513169

KEYWORDS: Ultrasonography, Printing, Actuators, 3D printing, Image quality, Imaging systems, Transducers, 3D image processing

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Proceedings Article | 8 March 2019 Paper

Conformal radiofrequency ablation to validate ultrasound thermometry

Chloé Audigier, Younsu Kim, Jens Ziegle, Michael Friebe, Emad Boctor

Proceedings Volume 10951, 1095122 (2019) https://doi.org/10.1117/12.2512788

KEYWORDS: Ultrasonography, Radiofrequency ablation, Thermometry, Liver, Tumors, Diagnostics

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Proceedings Article | 5 October 2018 Paper

Simulation of high intensity focused ultrasound ablation to enable ultrasound thermal monitoring

Chloé Audigier, Younsu Kim, Nicholas Ellens, Emad Boctor

Proceedings Volume 10576, 105762T (2018) https://doi.org/10.1117/12.2293770

KEYWORDS: Ultrasonography, Computer simulations, Wave propagation, Magnetic resonance imaging, Thermography, Thermal modeling, Thermometry, 3D modeling

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High Intensity Focused Ultrasound (HIFU) is a non-invasive ablative therapy. It is usually performed under MR monitoring, which provides reliable real-time thermal information to ensure a complete tumor ablation while preserving as much healthy tissue as possible. Unfortunately, many patients do not necessarily have access to this expensive and cumbersome cutting-edge technology, which is prohibitive for a widespread use of MRI to guide thermal ablation procedures. Ultrasound (US) is a promising low cost and portable alternative, that allows real-time monitoring and can easily be deployed outside hospitals. However, US-based thermometry alone is not robust enough for the monitoring of in-vivo tissue ablation, and its feasibility is demonstrated only on in-vitro cases for small range of temperatures, up to 50°C. Computational models can simulate the biophysical phenomena and mechanisms which govern this complex thermal therapy. The US wave propagation, the temperature evolution as well as the resulted necrotic lesion can be modeled. A method integrating those sources of information to intra-operative US data would allow to recover the accurate temperature in a wider range. Therefore, US thermometry could be improved and provide an inexpensive yet comprehensive method for intra-procedural monitoring of the ablative process through HIFU. In this paper, we propose to study the rise in temperature induced by high intensity US propagation in biological tissue, which is particularly difficult to simulate due to the complexity of the involved phenomena. The physics-based HIFU model simulates the nonlinear US propagation using a k-space model coupled with the heat propagation in biological tissue using a reaction-diffusion equation. We analyze numerically the model to evaluate its accuracy and related computational cost. Finally, our simulation approach is validated against MR thermometry, the gold-standard monitoring tool used in clinical setting. Three consecutive HIFU ablations were performed on a 2% agar and 2% silicon phantom using the Sonalleve V2 MR-HIFU system (Profound Medical, Toronto, Canada).

Proceedings Article | 13 April 2018 Open Access

Speed of sound reconstruction for HIFU ultrasound thermometry using an ultrasound element: simulation study (Withdrawal Notice)

Younsu Kim, Chloé Audigier, Nicholas Ellens, Emad Boctor

Proceedings Volume 10580, 1058013 (2018) https://doi.org/10.1117/12.2293141

KEYWORDS: Ultrasonography, Tissues, Error analysis, Thermometry, Acoustics, Computer simulations, Iterative methods, Optimization (mathematics), Medical imaging modalities, Temperature metrology

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SPIE Journal Paper | 2 April 2018

Toward dynamic lumbar puncture guidance using needle-based single-element ultrasound imaging

Haichong Zhang, Younsu Kim, Melissa Lin, Mateo Paredes, Karun Kannan, Abhay Moghekar, Nicholas Durr, Emad Boctor

JMI, Vol. 5, Issue 02, 021224, (April 2018) https://doi.org/10.1117/12.10.1117/1.JMI.5.2.021224

KEYWORDS: Ultrasonography, Computer programming, Bone, Tissues, Imaging systems, Transducers, Data acquisition, Image quality, Image processing, Signal processing

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SPIE Journal Paper | 27 March 2018

Photoacoustic-based catheter tracking: simulation, phantom, and in vivo studies

Alexis Cheng, Younsu Kim, Yuttana Itsarachaiyot, Haichong Zhang, Clifford Weiss, Russell Taylor, Emad Boctor

JMI, Vol. 5, Issue 02, 021223, (March 2018) https://doi.org/10.1117/12.10.1117/1.JMI.5.2.021223

KEYWORDS: Photoacoustic spectroscopy, Ferroelectric materials, Sensors, In vivo imaging, Acoustics, Chemical elements, Distance measurement, Image segmentation, Fluoroscopy, Imaging systems

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Proceedings Article | 2 May 2017 Presentation

Speed of sound estimation for thermal monitoring using an active ultrasound element during liver ablation therapy (Conference Presentation)

Younsu Kim, Chloé Audigier, Austin Dillow, Alexis Cheng, Emad Boctor

Proceedings Volume 10139, 101390F (2017) https://doi.org/10.1117/12.2254453

KEYWORDS: Chemical elements, Error analysis, High power microwaves, Ultrasonography, Tissues, Liver, Transducers, Temperature metrology, Ultrasound tomography

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Proceedings Article | 3 March 2017 Presentation + Paper

Toward dynamic lumbar punctures guidance based on single element synthetic tracked aperture ultrasound imaging

Haichong Zhang, Melissa Lin, Younsu Kim, Mateo Paredes, Karun Kannan, Nisu Patel, Abhay Moghekar, Nicholas Durr, Emad Boctor

Proceedings Volume 10135, 101350J (2017) https://doi.org/10.1117/12.2256040

KEYWORDS: Ultrasonography, Transducers, Bone, Imaging systems, Synthetic aperture radar, Emergency medicine, Diagnostics and therapeutics, Computer programming, Spine, Image resolution, Detection and tracking algorithms, Metals

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Proceedings Article | 3 March 2017 Paper

Computational modeling of radiofrequency ablation: evaluation on ex vivo data using ultrasound monitoring

Chloé Audigier, Younsu Kim, Austin Dillow, Emad Boctor

Proceedings Volume 10135, 1013525 (2017) https://doi.org/10.1117/12.2254986

KEYWORDS: Radiofrequency ablation, Ultrasonography, Data modeling, Computer simulations, Computational modeling, Liver cancer, Tissues, Blood vessels, Modeling, Error analysis, Liver, Ferroelectric materials, Temperature metrology, Tumors

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Proceedings Article | 3 March 2017 Paper

Consistent evaluation of an ultrasound-guided surgical navigation system by utilizing an active validation platform

Younsu Kim, Sungmin Kim, Emad Boctor

Proceedings Volume 10135, 1013524 (2017) https://doi.org/10.1117/12.2254464

KEYWORDS: Ultrasonography, Navigation systems, Optical tracking, Error analysis, Sensor technology, Detection and tracking algorithms, System identification, Calibration, Data acquisition

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Proceedings Article | 3 March 2017 Paper

Catheter tracking in an interventional photoacoustic surgical system

Alexis Cheng, Yuttana Itsarachaiyot, Younsu Kim, Haichong Zhang, Russell Taylor, Emad Boctor

Proceedings Volume 10135, 1013527 (2017) https://doi.org/10.1117/12.2254099

KEYWORDS: Photoacoustic spectroscopy, Chemical elements, Stereoscopic cameras, Photoacoustic imaging, Imaging systems, Ferroelectric materials, Acoustics, Image segmentation, Distance measurement, Fluoroscopy

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Proceedings Article | 3 March 2017 Paper

Software-based approach toward vendor independent real-time photoacoustic imaging using ultrasound beamformed data

Haichong Zhang, Howard Huang, Chen Lei, Younsu Kim, Emad Boctor

Proceedings Volume 10064, 100643O (2017) https://doi.org/10.1117/12.2252769

KEYWORDS: Ultrasonography, Signal processing, Photoacoustic imaging, Software development, Imaging systems, Transducers, Scanners, Image processing, Data acquisition

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Proceedings Article | 5 May 2016 Paper

New platform for evaluating ultrasound-guided interventional technologies

Younsu Kim, Xiaoyu Guo, Emad Boctor

Proceedings Volume 9790, 97901J (2016) https://doi.org/10.1117/12.2217242

KEYWORDS: Ultrasonography, Optical tracking, Ferroelectric materials, Data modeling, 3D acquisition, Data acquisition, Field programmable gate arrays, Breast, Receivers, Signal detection

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Proceedings Article | 5 May 2016 Paper

Speed of sound estimation with active PZT element for thermal monitoring during ablation therapy: feasibility study

Younsu Kim, Xiaoyu Guo, Alexis Cheng, Emad Boctor

Proceedings Volume 9790, 97901K (2016) https://doi.org/10.1117/12.2217086

KEYWORDS: Ultrasonography, Ferroelectric materials, Tissues, Temperature metrology, Control systems, Computer simulations, Chemical elements, Error analysis, Tumors, Thermal effects

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Showing 5 of 15 publications

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