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Full-range k-domain linearization in spectral-domain optical coherence tomography
Jeon, Mansik,Kim, Jeehyun,Jung, Unsang,Lee, Changho,Jung, Woonggyu,Boppart, Stephen A. The Optical Society 2011 Applied Optics Vol.50 No.8
<P>A full-bandwidth k-domain linearization method for spectral-domain optical coherence tomography (SD-OCT) is demonstrated. The method uses information of the wavenumber-pixel-position provided by a translating-slit-based wavelength filter. For calibration purposes, the filter is placed either after a broadband source or at the end of the sample path, and the filtered spectrum with a narrowed line width (??.5?m) is incident on a line-scan camera in the detection path. The wavelength-swept spectra are co-registered with the pixel positions according to their central wavelengths, which can be automatically measured with an optical spectrum analyzer. For imaging, the method does not require a filter or a software recalibration algorithm; it simply resamples the OCT signal from the detector array without employing rescaling or interpolation methods. The accuracy of k-linearization is maximized by increasing the k-linearization order, which is known to be a crucial parameter for maintaining a narrow point-spread function (PSF) width at increasing depths. The broadening effect is studied by changing the k-linearization order by undersampling to search for the optimal value. The system provides more position information, surpassing the optimum without compromising the imaging speed. The proposed full-range k-domain linearization method can be applied to SD-OCT systems to simplify their hardware/software, increase their speed, and improve the axial image resolution. The experimentally measured width of PSF in air has an FWHM of 8? at the edge of the axial measurement range. At an imaging depth of 2.5?m, the sensitivity of the full-range calibration case drops less than 10?B compared with the uncompensated case.</P>
Jeon, Mansik,Song, Wentao,Huynh, Elizabeth,Kim, Jungho,Kim, Jeesu,Helfield, Brandon L.,Leung, Ben Y. C.,Goertz, David E.,Zheng, Gang,Oh, Jungtaek,Lovell, Jonathan F.,Kim, Chulhong SPIE--the International Society for Optical Engine 2014 Journal of biomedical optics Vol.19 No.1
Ultrasound and photoacoustic imaging are highly complementary modalities since both use ultrasonic detection for operation. Increasingly, photoacoustic and ultrasound have been integrated in terms of hardware instrumentation. To generate a broadly accessible dual-modality contrast agent, we generated microbubbles (a standard ultrasound contrast agent) in a solution of methylene blue (a standard photoacoustic dye). This MB2 solution was formed effectively and was optimized as a dual-modality contrast solution. As microbubble concentration increased (with methylene blue concentration constant), photoacoustic signal was attenuated in the MB2 solution. When methylene blue concentration increased (with microbubble concentration held constant), no ultrasonic interference was observed. Using an MB2 solution that strongly attenuated all photoacoustic signal, high powered ultrasound could be used to burst the microbubbles and dramatically enhance photoacoustic contrast (>800-fold increase), providing a new method for spatiotemporal control of photoacoustic signal generation. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Jeon, Mansik,Kim, Jeehyun,Song, Jae-Won,Lee, Ho,Choi, Sanghoon,Nelson, J. Stuart Wiley Subscription Services, Inc., A Wiley Company 2008 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.50 No.5
<P>A simple, compact, and low cost tunable ring laser with a commercial semiconductor optical amplifier (SOA) was demonstrated. The tunable ring laser is based on an external wavelength filter cavity that is analogous with the Littman configuration with a diffraction grating, a mirror, and a simple slit. The unique structural advantage of this new system is that the slit is displaced to select a desired wavelength instead of tilting the mirror as in the Littman configuration. This allows easy control over the selected wavelength by the translating action of the slit. The full width half maximum (FWHM) wavelength turning range is 45 nm, and the wavelength resolution is about 2 pm. The demonstrated tunable ring laser has 2 mW output power. The side mode suppression ratios is 70–73 dB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1317–1320, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23340</P>
Jeon, Mansik,Jenkins, Samir,Oh, Junghwan,Kim, Jeehyun,Peterson, Tara,Chen, Jingyi,Kim, Chulhong Future Medicine Ltd 2014 Nanomedicine Vol.9 No.9
<P>The objectives of this study were to demonstrate nonionizing photoacoustic tomography (PAT) of bladders with near-infrared absorbing gold nanocages (GNCs) as an optical-turbid tracer and to investigate the fate of GNCs after photoacoustic imaging.</P>
Lee, Changho,Jeon, Mansik,Jeon, Min Yong,Kim, Jeehyun,Kim, Chulhong The Optical Society 2014 Applied Optics Vol.53 No.18
<P>We have utilized a single pulsed broadband supercontinuum laser source to photoacoustically sense total hemoglobin concentration (HbT) and oxygen saturation of hemoglobin (SO2) in bloods in vitro. Unlike existing expensive and bulky laser systems typically used for functional photoacoustic imaging (PAI), our laser system is relatively cost-effective and compact. Instead of using two single wavelengths, two wavelength bands were applied to distinguish the concentrations of two different chromophores in the mixture. In addition, we have successfully extracted the total dye concentration and the ratio of the red dye concentration to the total dye concentration in mixed red and blue dye solutions in phantoms. The results indicate that PAI with a cheap and compact fiber based laser source can potentially provide HbT and SO2 in live animals in vivo.</P>
화학물질관리법 조사·보고자료를 활용한 화학물질취급 안전보건관리에 대한 효율적인 체계 마련
전다영(DaYoung Jeon),황만식(ManSik Hwang),임지영(JiYoung Im),류지성(JiSung Ryu),김영호(YoungHo Kim),이지호(JiHo Lee) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.2
Objectives: The purpose of this study is to develop a management system for the safe handling of chemicals and related health management based on reporting under the Chemical Control Act (CCA). It is used to search handling information by constructing data linked to the name of companies, chemicals, products, etc. Methods: Due to the differences in submission periods for each reporting regulation of the Chemical Control Act, the data used is as follows: A statistical survey collected 26,222 companies in 2014 and 2016, Pollutant Release Transfer Registers (PRTR) collected 4,234 companies in 2015-2017, performance reports by handlers of hazardous chemical substances collected 14,658 companies in 2016-2018, and declarations for import of toxic chemicals collected 892 companies in 2016-2017. The total information on 36,080 companies is standardized based on company ID, name, business registration number, address, and more. The data were classified into information such as company, chemical, and product name and amounts handled and released, and then extracted according to criteria to establish relationships among classified information. Results: A search service was developed for handling information on chemical substances for reporting data by linking four reporting data: statistical survey, PRTR, performance report by handler of hazardous chemical substances, and declaration for import of toxic chemicals under the CCA. It was composed of five menus to search by regulation type, reporting regulation, companies and chemicals, and system management. Conclusion: It is necessary to use data linked by company, region, and chemical to respond and to prevent chemical accidents. In addition, these items can be utilized to perform handling and safety management of chemicals according to whether regulations under the CCA may be implemented.
Handheld Optical Coherence Tomography Scanner for Primary Care Diagnostics
Jung, Woonggyu,Kim, Jeehyun,Jeon, Mansik,Chaney, Eric J.,Stewart, Charles N.,Boppart, Stephen A. IEEE 2011 IEEE Transactions on Biomedical Engineering Vol.58 No.3
<P>The goal of this study is to develop an advanced point-of-care diagnostic instrument for use in a primary care office using handheld optical coherence tomography (OCT). This system has the potential to enable earlier detection of diseases and accurate image-based diagnostics. Our system was designed to be compact, portable, user-friendly, and fast, making it well suited for the primary care office setting. The unique feature of our system is a versatile handheld OCT imaging scanner which consists of a pair of computer-controlled galvanometer-mounted mirrors, interchangeable lens mounts, and miniaturized video camera. This handheld scanner has the capability to guide the physician in real time for finding suspicious regions to be imaged by OCT. In order to evaluate the performance and use of the handheld OCT scanner, the anterior chamber of a rat eye and in vivo human retina, cornea, skin, and tympanic membrane were imaged. Based on this feasibility study, we believe that this new type of handheld OCT device and system has the potential to be an efficient point-of-care imaging tool in primary care medicine.</P>
Super-resolution visible photoactivated atomic force microscopy
Lee, Seunghyun,Kwon, Owoong,Jeon, Mansik,Song, Jaejung,Shin, Seungjun,Kim, HyeMi,Jo, Minguk,Rim, Taiuk,Doh, Junsang,Kim, Sungjee,Son, Junwoo,Kim, Yunseok,Kim, Chulhong Nature Publishing Group 2017 Light, science & applications Vol.6 No.11
<P>Imaging the intrinsic optical absorption properties of nanomaterials with optical microscopy (OM) is hindered by the optical diffraction limit and intrinsically poor sensitivity. Thus, expensive and destructive electron microscopy (EM) has been commonly used to examine the morphologies of nanostructures. Further, while nanoscale fluorescence OM has become crucial for investigating the morphologies and functions of intracellular specimens, this modality is not suitable for imaging optical absorption and requires the use of possibly undesirable exogenous fluorescent molecules for biological samples. Here we demonstrate super-resolution visible photoactivated atomic force microscopy (pAFM), which can sense intrinsic optical absorption with ~8 nm resolution. Thus, the resolution can be improved down to ~8 nm. This system can detect not only the first harmonic response, but also the higher harmonic response using the nonlinear effect. The thermoelastic effects induced by pulsed laser irradiation allow us to obtain visible pAFM images of single gold nanospheres, various nanowires, and biological cells, all with nanoscale resolution. Unlike expensive EM, the visible pAFM system can be simply implemented by adding an optical excitation sub-system to a commercial atomic force microscope.</P>