A5060275852- Advanced MRI Techniques and Applications
- Atomic and Subatomic Physics Research
- Image Processing Techniques and Applications
- Lower Extremity Biomechanics and Pathologies
- Concrete Corrosion and Durability
- Medical Imaging Techniques and Applications
- Infrastructure Maintenance and Monitoring
- Industrial Vision Systems and Defect Detection
- Glioma Diagnosis and Treatment
- Lanthanide and Transition Metal Complexes
- MRI in cancer diagnosis
- Cardiac Imaging and Diagnostics
- Fire effects on concrete materials
- Cerebrovascular and Carotid Artery Diseases
- Bone and Joint Diseases
- NMR spectroscopy and applications
- Concrete Properties and Behavior
- Sparse and Compressive Sensing Techniques
Dongguk University
2021
University of Ulsan
2014-2021
Asan Medical Center
2014-2021
Ulsan College
2014-2020
Objective: To compare conventional sensitivity encoding (SENSE) to compressed sensing plus SENSE (CS) for highresolution magnetic resonance imaging (HR-MRI) of intracranial and extracranial arteries.Materials Methods: HR-MRI was performed in 14 healthy volunteers.Three-dimensional T1-weighted (T1WI) proton density-weighted (PD) were acquired using CS or under the same total acceleration factors (AFt)-5.5, 6.8, 9.7 T1WI 3.2, 4.0, 5.8 PD-to achieve reduced scanning times comparison with...
본 연구에서는 디지털 이미지 분석기술을 이용하여 콘크리트 구조물의 대표적인 열화인자인 콘크리트의 균열을 검지할 수 있는 기술을 개발하기 위해 형태수리학에 근거한 모폴로지 기법이 도입된 분석기법을 적용한 균열검출 시스템을 개발하였다. 개발된 시스템에는 분석결과의 효율적인 관리를 고려하여 촬영된 다수의 이미지를 하나의 전체 이미지로 재구성하는 조합기술이 추가로 적용되었다. 그리고 시스템의 적용성 및 신뢰도 검증은 균열이 발생된 암거를 이용한 현장검증 실험을 통해 이루어졌으며, 실험에 사용된 촬영장비로는 40m까지 0.2mm의 성능을 확인하였다. 분석을 산정된 균열폭의 경우 실측 균열폭과의 차이가 최대 0.08mm로 나타나 일정 수준 이상의 정확도를 구명하였고, 조합의 추상 패턴 면에 대한 분할 촬영 조합한 결과 실제 전체촬영 원본 이미지와 육안으로 차이를 확인할 없을 정도로 우수한 조합결과를 도출하였다. In this study, the crack detecting system...
Purpose To compare the ability of 2-hydroxyglutarate (2HG)–to–lipid and lactate (2HG/[lipid + lactate]) ratio with 2HG concentration alone to predict isocitrate dehydrogenase (IDH) mutation status in patients glioma. Materials Methods In this retrospective study, consecutive histopathologically proven glioma were enrolled between July 2016 February 2019. A total 79 (mean age, 44 years; 49 men). The other MR spectroscopic parameters measured by single-voxel point-resolved spectroscopy before...
Incomplete fat suppression induced by magnetic field inhomogeneity is difficult to compensate for with hardware magnetic-field shimming.To evaluate the effectiveness of a silicone device used obtain homogeneous during 3T resonance imaging (MRI) scans foot.Thirty-eight healthy volunteers were enrolled and examined twice, before (group A) after B) application device. Fat-saturated, T2-weighted, fast spin-echo images acquired using same scanning protocol at both examinations. Signal-...
This study compared sensitivity encoding (SENSE) and compressed sensing (CS-SENSE) for phase oversampling distance assessed its impact on image quality acquisition time. The experiment was performed with a large diameter phantom using 16-channel anterior body coils. All imaging data were divided into three groups according to the parallel technique distances: A (SENSE of 150 mm), B (CS-SENSE 100 C 75 mm). No statistically significant differences observed among A, B, regarding both T2 T1...
Abstract In this study, we assessed how image quality depends on the angle of tilt a flex coil supporting device during an MRI examination. All measurements were performed with American College Radiology (ACR) phantom using device. images analyzed automatic assessment method following ACR accreditation guidance. Image was compared between acquisitions grouped according to device: group A (Flat mode), B (10˚), and C (18˚). measured qualities within recommended criteria, regardless However,...
기존 콘크리트 구조물 내력은 변위 및 스트레인 게이지를 통해 기지의 가력에 따른 변화량을 계측하고, 그 결과를 수치해석 결과와 비교하여 평가한다. 이는 결과적으로 현존 콘크리트의 잔류응력을 계측 평가하므로써 완성될 수 있다. 본 논문은 실험적 응력해석법의 일환으로 구조물에 대한 비파괴적인 방식으로 평가하는 IITC (Instrumented Indentation Technique for Concrete) 시스템 개발과 관련된 것으로 표면에서 압입하중과 압입깊이와의 상관관계를 이용한 평가방법을 논하였다. 연구에서는 구성되는 H/W 분석용 S/W는 새롭게 개발하였으며, 다각도의 실험결과를 이용하여 구조물에서의 잔류응력 추정식을 창출하였고, 자동으로 평가케 함으로써 구조물의 축성단계에서부터 유지관리 단계에까지 자유롭게 내력을 산정할 있도록 하였다. The carrying capacity of existing concrete structures is evaluated by the...