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Dive into the research topics where Byung Gi Park is active.

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Featured researches published by Byung Gi Park.


IEEE Transactions on Nuclear Science | 2008

Measurement of Two-Dimensional Photon Beam Distributions Using a Fiber-Optic Radiation Sensor for Small Field Radiation Therapy

Bongsoo Lee; Kyoung Won Jang; Dong Hyun Cho; Wook Jae Yoo; Sang Hun Shin; Hyung Sik Kim; Jeong Han Yi; Sin Kim; Hyosung Cho; Byung Gi Park; Joo Hyun Moon; Siyong Kim

In this study, a fiber-optic radiation sensor with an organic scintillator is fabricated to measure high-energy photon beam from a clinical linear accelerator (CLINAC) and a fiberoptic sensor array is also fabricated to measure two-dimensional, high-resolution and real-time dose distributions for small field radiotherapy dosimetry. The scintillating lights generated from each organic sensor probe embedded and arrayed in a water phantom are guided by 10 m plastic optical fibers to the light- measuring device. The two-dimensional photon beam distributions in a water phantom are measured with different energies and field sizes of photon beams. Also, percent depth dose curves for 6 and 15 MV photon beams are obtained.


IEEE Transactions on Nuclear Science | 2010

Measurements of Relative Depth Doses Using Fiber-Optic Radiation Sensor and EBT Film for Brachytherapy Dosimetry

Bongsoo Lee; Wook Jae Yoo; Kyoung Won Jang; Dong Hyun Cho; Jeong Ki Seo; Ji Yeon Heo; Sang Hun Shin; Joo Hyun Moon; Byung Gi Park; Young-Ho Cho; Sin Kim

In this study, we have fabricated a fiber-optic radiation sensor using an organic scintillator for brachytherapy dosimetry. Organic scintillators are made from a polystyrene base with wavelength-shifting fluors, and they do not disturb the radiation field due to their tissue or water-equivalent characteristics in a wide range of energies. The fiber-optic radiation sensor developed for this study provides a fast real-time response and convenient usage for brachytherapy dosimetry. For more accurate measurement, we have measured Cerenkov light using a dummy fiber and avoided dose measurement errors arising from high dose gradients in brachytherapy dosimetry. The Cerenkov light has been eliminated using a modified subtraction method. Also, the relative depth dose without the dose generated from Cerenkov lights is measured and compared with the results obtained using conventional EBT dosimetry films.


IEEE Transactions on Nuclear Science | 2008

Characterization of One-Dimensional Fiber-Optic Scintillating Detectors for Electron-Beam Therapy Dosimetry

Bongsoo Lee; Kyoung Won Jang; Dong Hyun Cho; Wook Jae Yoo; Sang Hun Shin; Gye-Rae Tack; Soon-Cheol Chung; Sin Kim; Hyosung Cho; Byung Gi Park; Joo Hyun Moon; Siyong Kim

In this study, a one-dimensional fiber-optic scintillating detector was developed for electron-beam therapy dosimetry. Each fiber-optic detector contains an organic scintillator as a sensitive volume and it is embedded and arrayed in a plastic phantom to measure one-dimensional high-energy electron-beam profiles of clinical linear accelerators. Plastic optical fibers guide the scintillating light which each detector probe generates to a photodiode array. The one-dimensional electron-beam profiles in the plastic phantom were measured in two different field sizes and for two electron-beam energies. Also, isodose and two-dimensional dose distributions in the plastic phantom were obtained using the one-dimensional scintillating detector array with two different electron beam energies.


Journal of Sensor Science and Technology | 2012

Development of Fiber-optic Radiation Sensor Using LYSO Scintillator for Gamma-ray Spectroscopy

Ki-Tek Han; Wook Jae Yoo; Sang Hun Shin; Dayeong Jeon; Jang-Yeon Park; Byung Gi Park; Bongsoo Lee

A fiber-optic radiation sensor was fabricated using a sensing probe, a plastic optical fiber, a photomultiplier tube, and a multichannel analyzer for gamma-ray spectroscopy. As an inorganic scintillator of the sensing probe, a LYSO crystal was used. In this study, we obtained the relationship between the photon counts of the fiber-optic radiation sensor and the activity of the radioactive isotope. In addition, the gamma-ray energy spectra were also measured using a fiber-optic radiation sensor to discriminate species of gamma-ray emitters.


Sensors | 2012

Integral T-Shaped Phantom-Dosimeter System to Measure Transverse and Longitudinal Dose Distributions Simultaneously for Stereotactic Radiosurgery Dosimetry

Wook Jae Yoo; Jinsoo Moon; Kyoung Won Jang; Ki-Tek Han; Sang Hun Shin; Dayeong Jeon; Jang-Yeon Park; Byung Gi Park; Bongsoo Lee

A T-shaped fiber-optic phantom-dosimeter system was developed using square scintillating optical fibers, a lens system, and a CMOS image camera. Images of scintillating light were used to simultaneously measure the transverse and longitudinal distributions of absorbed dose of a 6 MV photon beam with field sizes of 1 × 1 and 3 × 3 cm2. Each optical fiber has a very small sensitive volume and the sensitive material is water equivalent. This allows the measurements of cross-beam profile as well as the percentage depth dose of small field sizes. In the case of transverse dose distribution, the measured beam profiles were gradually become uneven and the beam edge had a gentle slope with increasing depth of the PMMA phantom. In addition, the maximum dose values of longitudinal dose distribution for 6 MV photon beam with field sizes of 1 × 1 and 3 × 3 cm2 were found to be at a depth of approximately 15 mm and the percentage depth dose of both field sizes were nearly in agreement at the skin dose level. Based on the results of this study, it is anticipated that an all-in-one phantom-dosimeter can be developed to accurately measure beam profiles and dose distribution in a small irradiation fields prior to carrying out stereotactic radiosurgery.


Journal of Sensor Science and Technology | 2009

Spectroscopic study on the development of fiber-optic pH sensor

Wook Jae Yoo; Ji Yeon Heo; Dong Hyun Cho; Kyoung Won Jang; Jeong Ki Seo; Bongsoo Lee; Young-Ho Cho; Joo Hyun Moon; Byung Gi Park

In this study, we have fabricated a fiber-optic pH sensor which is composed of a light source, plastic optical fibers and a spectrometer. As an indicator, a phenol red is used, and a pH liquid solution is prepared by mixing of phenol red and various kinds of pH buffer solutions in these experiments. The emitting light from a light source is guided by plastic optical fibers to the pH liquid solution, and the optical characteristic of a light is changed in the pH liquid solution according to its color change. Therefore, we have measured the intensities and wavelength shifts of the modulated lights, which are changed due to the color variations of phenol red at different pH values, by using of a spectrometer for spectral analysis. Also, the relationships between the pH values of liquid solutions and the optical properties of modulated light according to the change of color of phenol red are obtained.


Sensors | 2011

Development of a 2-Channel Embedded Infrared Fiber-Optic Temperature Sensor Using Silver Halide Optical Fibers

Wook Jae Yoo; Kyoung Won Jang; Jeong Ki Seo; Jinsoo Moon; Ki-Tek Han; Jang-Yeon Park; Byung Gi Park; Bongsoo Lee

A 2-channel embedded infrared fiber-optic temperature sensor was fabricated using two identical silver halide optical fibers for accurate thermometry without complicated calibration processes. In this study, we measured the output voltages of signal and reference probes according to temperature variation over a temperature range from 25 to 225 °C. To decide the temperature of the water, the difference between the amounts of infrared radiation emitted from the two temperature sensing probes was measured. The response time and the reproducibility of the fiber-optic temperature sensor were also obtained. Thermometry with the proposed sensor is immune to changes if parameters such as offset voltage, ambient temperature, and emissivity of any warm object. In particular, the temperature sensing probe with silver halide optical fibers can withstand a high temperature/pressure and water-chemistry environment. It is expected that the proposed sensor can be further developed to accurately monitor temperature in harsh environments.


Journal of Sensor Science and Technology | 2010

Measurement of relative dose irradiated from a Co-60 source using a scintillating fiber-optic dosimeter

Kyoung Won Jang; Dong Hyun Cho; Wook Jae Yoo; Jeong Ki Seo; Ji Yeon Heo; Bongsoo Lee; Sang Hun Shin; Byung Gi Park; Sin Kim

In this study, we have fabricated a scintillating fiber-optic dosimeter for a radiotherapy dosimetry. And -rays generated by a Co-60 are measured using a scintillating fiber-optic dosimeter and percent depth dose curves are obtained according to the different depths of solid water phantoms. Also, Cerenkov radiations generated by primary or secondary electrons are measured at different depths of water phantom using a background optical fiber.


Journal of Sensor Science and Technology | 2011

Development of Reflection-type Fiber-optic pH Sensor Using Sol-gel Film

Wook Jae Yoo; Jeong Ki Seo; Kyoung Won Jang; Jinsoo Moon; Ki-Tek Han; Jang-Yeon Park; Bongsoo Lee; Seunghyun Cho; Ji Yeon Heo; Byung Gi Park

A reflection-type fiber-optic pH sensor, which is composed of a pH sol-gel film, plastic optical fibers, a mirror, a light source and a spectrometer, is developed in this study. As pH indicators, a bromthymol blue, a cresol red and a thymol blue are used, and they are immobilized in the sol-gel films. The emitted light from a light source is guided by a fiber-optic Y-coupler and plastic optical fibers to the pH sol-gel film in a pH sensing probe. The pH change in the sensing probe gives rise to a change in the color of the pH sol-gel film, and the optical characteristic of reflected light through the pH sol-gel film is also changed. Therefore, we have measured the spectra of reflected lights, which are changed according to the color variations of the pH sol-gel films with different pH values, by using of a spectrometer. Also, the relationships between the pH values and the intensities of reflected lights are obtained on the basis of the color variations of the pH sol-gel films.


Journal of Sensor Science and Technology | 2008

Measurements of relative depth dose rates for a brachytherapy Ir-192 sourceusing an organic scintillator fiber-optic radiation sensor

Sang Hun Shin; Kyoung Won Jang; Dong Hyun Cho; Wook Jae Yoo; Jeong Ki Seo; Bongsoo Lee; Joo Hyun Moon; Sin Kim; Byung Gi Park

In this study, we have fabricated a fiber-optic radiation sensor using an organic scintillator and plastic optical fiber for brachytherapy dosimetry. Also, we have measured relative depth dose rates of Ir-192 source using a fiber-optic sensor and compared them with the results obtained using a conventional EBT film. Cerenkov lights which can be a noise in measuring scintillating light with a fiber-optic sensor are measured and eliminated by using of a background optical fiber. It is expected that a fiber-optic radiation sensor can be used in brachytherapy dosimetry due to its advantages such as a low cost, simple usage and a small volume.

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Dong Hyun Cho

Soonchunhyang University

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Sin Kim

Jeju National University

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