A5101826249- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced X-ray and CT Imaging
- Nuclear Physics and Applications
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Carbon Nanotubes in Composites
- Mechanical and Optical Resonators
- Advancements in Semiconductor Devices and Circuit Design
- Radiation Dose and Imaging
- Boron Compounds in Chemistry
- Metal and Thin Film Mechanics
- Radiation Effects in Electronics
- Magnetic Bearings and Levitation Dynamics
- Nonmelanoma Skin Cancer Studies
- Inertial Sensor and Navigation
- Digital Radiography and Breast Imaging
- Nanowire Synthesis and Applications
- Advanced Semiconductor Detectors and Materials
- Advanced MRI Techniques and Applications
- Copper Interconnects and Reliability
- Advanced X-ray Imaging Techniques
- Radiation Effects and Dosimetry
Seoul National University Hospital
2024-2025
Seoul National University
2024
Yonsei University
2017-2024
Chungbuk National University
2024
Korea Advanced Institute of Science and Technology
2009-2010
Abstract Colorectal cancer is among the most common cancers in terms of both incidence and mortality. External beam radiotherapy frequently used to treat colorectal cancer. In radiotherapy, gonad considered as an organ that must be spared owing its radiosensitivity. However, only a few medical facilities use gonadal shields. addition, contribution internal scatter dose should because it unavoidable. Therefore, this study aimed investigate effectiveness shield according thickness evaluate...
Background: The gamma emission tomography (GET) device has been reported a reliable technique to inspect partial defects within spent nuclear fuel (SNF) of pin-by-pin level. However, the existing GET devices have low accuracy owing high attenuation and scatter probability for SNF inspection condition. purpose this study is design optimize Yonsei single-photon computed version 2 (YSECT.v.2) fast in water storage by acquisition high-quality tomographic images.Materials Methods: Using Geant4...
Background Monte Carlo (MC) simulation is the most accurate for calculating radiation dose distribution and determining patient dose. In MC simulations of therapeutic accelerator, characteristics initial electron must be precisely determined in order to achieve simulations. However, It has been computation-, labor-, time-intensive predict beam through predominantly empirical approach. The aim this study was analyze relationships between parameters distribution, with goal simplifying...
An accurate knowledge of in vivo proton dose distribution is key to fully utilizing the potential advantages therapy. Two representative indirect methods for range verification, namely, prompt gamma (PG) imaging and positron emission tomography (PET), are available. This study proposes a PG-PET system that combines these two presents detector geometry background reduction techniques optimized system. The characteristics secondary radiations emitted by water phantom interaction with 150 MeV...
The International Atomic Energy Agency (IAEA) mandates safeguards to ensure non-proliferation of nuclear materials. Among inspection techniques used detect partial defects within spent fuel (SNF), gamma emission tomography (GET) has been reported be reliable for detection on a pin-by-pin level. Conventional GET, however, is limited by low efficiency due the high density rods and self-absorption. This paper proposes new type GET named Spent Fuel Internal Tomography (SFIT), which can acquire...
We report an experimental method to determine the spring constant of a multiwalled carbon nanotube (MWNT) cantilever as mechanical piconewton force transducer. Electrostatic actuation was employed investigate properties MWNT cantilever. In order measure nanotube’s deflection during actuation, fluorescent dyes were noncovalently attached end nanotubes. Also, length dependence is studied by adjusting via electrochemical etching. The results show that small 0.001 N/m and tunable in range 0.001–0.05 N/m.
The complex beam delivery techniques for patient treatment using a clinical linear accelerator (linac) may result in variations the photon spectra, which can lead to dosimetric differences patients that cannot be accounted by current planning systems (TPSs). Therefore, precise knowledge of fluence and energy spectrum (ES) therapeutic is very important. However, owing high flux beam, ES measured directly, validation modeled TPS difficult. aim this study develop an efficient transmission...
Abstract Despite the improvements in dose calculation models of commercial treatment planning systems ( TPS ), their ability to accurately predict patient is still limited. One limitations caused by simplified model multileaf collimator MLC ). The aim this study was develop a Monte Carlo MC ) method‐based independent validation system with an elaborate for more accurate evaluation. Varian Clinac 2300 IX simulated using Geant4 toolkits, after which commissioning measurements performed...
A method to measure the deflection of a nanotube cantilever with nanometer accuracy in an air or liquid environment is presented. We attached fluorescent dyes at end detect its deflection. The was fabricated multiwalled carbon that electrochemically etched tungsten tip, and it imaged epifluorescence microscope system. fluorescence intensity distribution particles approximated Gaussian fitted by least-squares method. Finally, we were able displacement during electrostatic actuation positional...
A new synthesized magnetic focusing (SMF) technology for multiple coaxial circular coils is proposed in this paper. The fundamental principle of the plane SMF provided comparing with previous as well transcranial stimulation (TMS) medical applications. theory determines appropriate currents coils, resulting a focused field distribution across three-dimensional space. Simulation results show that 4.2 times sharper cost reduced peak field. Experiments five 50 cm diameter at focal distance 10...
Purpose: Accurate operation of the multi-leaf collimator (MLC), a key technology in intensity modulated radiation therapy (IMRT), is essential for safe and optimal treatment.The Halcyon TM linear accelerator has with low leakage transmission, making it suitable IMRT.The limitations existing MLC quality assurance (QA) method were supplemented mathematical method, results analyzed.Methods: Electric portal imaging device (EPID) images obtained by performing QA plan on was analyzed using...
Yoonsuk Huh, Hyojun Park, Jin Jegal, Inbum Lee, Jaeman Son, Seonghee Kang, Chang Heon Choi, Jung-in Kim, Hyeongmin Jin. Progress in Medical Physics 2024;35:116-24. https://doi.org/10.14316/pmp.2024.35.4.116