A5068922436- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Radiomics and Machine Learning in Medical Imaging
- Lung Cancer Diagnosis and Treatment
- Radiation Detection and Scintillator Technologies
- Head and Neck Cancer Studies
- Effects of Radiation Exposure
- Management of metastatic bone disease
- Helicobacter pylori-related gastroenterology studies
- Advanced MRI Techniques and Applications
- Breast Cancer Treatment Studies
- Nuclear Physics and Applications
- Prostate Cancer Diagnosis and Treatment
- Gastric Cancer Management and Outcomes
- Radiation Effects and Dosimetry
- Medical Imaging and Analysis
- Material Properties and Processing
- Skin Protection and Aging
- Radiation Effects in Electronics
- Digital Radiography and Breast Imaging
- Anatomy and Medical Technology
- Photochromic and Fluorescence Chemistry
Seoul National University
2016-2025
Inha University
2025
Seoul Veterans Hospital
2018-2024
Pusan National University
2004-2024
Korea University Medical Center
2024
University of Michigan
2024
Seoul National University Hospital
2014-2023
Advanced Institute of Convergence Technology
2014-2023
Korea Meteorological Administration
2023
Hyundai Motors (South Korea)
2022
The aim of this study is to present a modulation index (MI) for volumetric modulated arc therapy (VMAT) based on the speed and acceleration analysis modulating-parameters such as multi-leaf collimator (MLC) movements, gantry rotation dose-rate, comprehensively. performance presented MI (MIt) was evaluated with correlation analyses pre-treatment quality assurance (QA) results, differences in between VMAT plans versus dynamic log files, dose-volumetric parameters reconstructed using files. For...
To investigate the sensitivity of various gamma criteria used in gamma-index method for patient-specific volumetric modulated arc therapy (VMAT) quality assurance (QA) stereotactic body radiation (SBRT) using a flattening filter free (FFF) photon beam.Three types intentional misalignments were introduced to original high-definition multi-leaf collimator (HD-MLC) plans. The first type, referred Class Out, involved opening each bank leaves. second In, closing third Shift, shifting leaves...
Discrepancies between planned and delivered movements of multi-leaf collimators (MLCs) are an important source errors in dose distributions during radiotherapy. In this work we used machine learning techniques to train models predict these discrepancies, assessed the accuracy model predictions, examined impact have on quality assurance (QA) procedures dosimetry. Predictive leaf motion parameters for were calculated from plan files, such as position velocity, whether was moving towards or...
Purpose The aim of this study was to assess the feasibility and advantages a patient-specific breast bolus made using 3D printer technique. Methods We used anthropomorphic female phantom with attachments, which volumes are 200, 300, 400, 500 650 cc. simulated treatment for right patient parallel opposed tangential fields. Treatment plans were investigate effect unwanted air gaps under on dose distribution whole breast. commercial Super-Flex 3D-printed polylactic acid (PLA) applied skin...
The aim of this study was to compare the plan quality magnetic-resonance image-based intensity modulated radiation therapy (MRI-based-IMRT) with MRIdian Linac system that volumetric arc (VMAT) TrueBeam STx for lung stereotactic ablative radiotherapy (SABR). A total 22 patients tumors located in lower lobe were retrospectively selected study. For each patient, both MRI-based-IMRT and VMAT plans generated using an identical CT image set structures exception planning target volume (PTV). PTVs...
Metal Material Extrusion Additive Manufacturing (M-MEAM) is a building process by extruding filaments composed of metal powders and polymer binder layer-by-layer. M-MEAM has been getting spotlighted because its superior economic feasibility accessibility than other AMs. In this study, 17-4PH steels were manufactured with post sintering process. Heat treatments (HT) also applied to MEAM sintered parts the microstructures, mechanical properties, corrosion properties investigated according HT...
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...
We investigate the gamma passing rate (GPR) consistency when applying different types of analyses, linacs, and dosimeters for volumetric modulated arc therapy (VMAT).A total 240 VMAT plans various treatment sites, which were generated with Trilogy (140 plans) TrueBeam STx (100 plans), retrospectively selected. For each plan, planar dose distributions measured both MapCHECK2 ArcCHECK dosimeters. During distribution measurements, actual multileaf collimator (MLC) positions, gantry angles,...
The aim of this study is to present a modulation index considering both mechanical and dose calculation uncertainties for volumetric modulated arc therapy (VMAT). As only uncertainty VMAT, MIt has been previously suggested. In study, we developed weighting factor which represents based on the aperture shapes fluence maps at every control point VMAT plans. order calculate factor, thinning algorithm image processing techniques was applied measure field irregularity. By combining with suggested...
Abstract Background Dyspigmentation is a common cosmetic concern among Asians. Many individuals exhibit mixed pigmentary entities including melasma, flat/small seborrheic keratoses, ephelides, solar lentigines and acquired bilateral nevus‐of‐Ota‐like macules (ABNOM). We term this phenomenon complex dyspigmentation (CD) suggest that combination strategy may be more efficacious than any singular modality. Objective To determine the effectiveness of combined intense‐pulsed light (IPL) for...
Abstract One of the physiologic consequences excessive UV radiation (UVR) exposure is apoptosis. This critical response serves to eliminate genetically injured cells and arises, in part, from activation DNA damage p53 signaling. Other contributory pathways, however, likely exist but have not been fully characterized. In a recent global screen UVR genes melanocytes, we identified receptor tyrosine kinase EPHA2. Using combination genetic pharmacologic approaches, set out investigate upstream...
We investigated the effect of mixing high- and low-energy photon beams on quality intensity-modulated radiation therapy (IMRT) plans for patients with prostate cancer. Three different each twenty were generated using either 6 MV or 15 alone, both beams. All planning parameters, goals, constraints set to be identical except beam energy. The dose distributions similar in terms target coverage, conformity, homogeneity regardless V(70Gy) rectal wall MV, mixed-energy was 16.7%, 17.9%, 16.3%,...
Purpose: Texture analysis on fluence maps was performed to evaluate the degree of modulation for volumetric modulated arc therapy (VMAT) plans. Methods: A total six textural features including angular second moment, inverse difference contrast, variance, correlation, and entropy were calculated generated from 20 prostate head neck VMAT For each features, particular displacement distances ( d ) 1, 5, 10 adopted. To investigate deliverability plan, gamma passing rates pretreatment quality...