1.Principle and Experiments in Diffusion Tensor Imaging.
Journal of the Korean Society of Magnetic Resonance in Medicine 2002;6(2):107-113
No abstract available.
Diffusion Tensor Imaging*
;
Diffusion*
2.A Diffusion-based Model Theory of Passive-Targeted Drug Delivery in Solid Tumors.
Joon Hyuck CHOI ; Nam Lyong KANG ; Sang Don CHOI
Korean Journal of Medical Physics 2007;18(3):161-166
A model theory of passive-targeted drug delivery in sphere-shaped solid tumors is introduced on the basis of Fick's law of diffusion, with appropriate boundary and initial conditions. For a uniform initial concentration inside the tumor, the concentration is obtained as a function of time and radial position. The concentration is shown to approach the equilibrium distribution as the time elapses, as is expected by the Gedanken Experiment. The time-evolution rate is found to be determined by the diffusion coefficient of the drug in the tissue, the size of the tumor, the volume of the drug-injected region, and the concentration gradient at the boundary.
Diffusion
;
Jurisprudence
3.In vitro antibacterial potency of teicoplanin by the disc diffusion method.
Pyung Han HWANG ; Jung Soo KIM ; Yang Keun LEE ; Mi Ae YOON ; Sam Im CHOI
Korean Journal of Infectious Diseases 1993;25(1):33-43
No abstract available.
Diffusion*
;
Teicoplanin*
4.Diffusion Tensor Imaging Findings in Two Cases of Internal Capsular Genu Infarction.
Kyoung Mo AHN ; Jung Mi KIM ; Sang Won HA ; Ki Moo HONG ; Seung Yun LEE ; Doo Eung KIM
Journal of the Korean Neurological Association 2010;28(2):104-107
Internal capsular genu infarcts infrequently cause cognitive impairment and behavioral changes, and little is known about the underlying mechanism. Using diffusion-tensor imaging (DTI) and the fractional anisotropy (FA) index in the region of interest (ROI) and ipsilesional frontal cortex, we evaluated two patients with internal capsular genu infarction who presented with frontal dysfunction and cognitive impairment. The reported findings help to elucidate the mechanism underlying cognitive deterioration in internal capsular genu infarction.
Anisotropy
;
Diffusion
;
Diffusion Tensor Imaging
;
Humans
;
Infarction
5.Mini-Review of Studies Reporting the Repeatability and Reproducibility of Diffusion Tensor Imaging
Jeong Pyo SEO ; Young Hyeon KWON ; Sung Ho JANG
Investigative Magnetic Resonance Imaging 2019;23(1):26-33
PURPOSE: Diffusion tensor imaging (DTI) data must be analyzed by an analyzer after data processing. Hence, the analyzed data of DTI might depend on the analyzer, making it a major limitation. This paper reviewed previous DTI studies reporting the repeatability and reproducibility of data from the corticospinal tract (CST), one of the most actively researched neural tracts on this topic. MATERIALS AND METHODS: Relevant studies published between January 1990 and December 2018 were identified by searching PubMed, Google Scholar, and MEDLINE electronic databases using the following keywords: DTI, diffusion tensor tractography, reliability, repeatability, reproducibility, and CST. As a result, 15 studies were selected. RESULTS: Measurements of the CSTs using region of interest methods on 2-dimensional DTI images generally showed excellent repeatability and reproducibility of more than 0.8 but high variability (0.29 to 1.00) between studies. In contrast, measurements of the CST using the 3-dimensional DTT method not only revealed excellent repeatability and reproducibility of more than 0.9 but also low variability (repeatability, 0.88 to 1.00; reproducibility, 0.82 to 0.99) between studies. CONCLUSION: Both 2-dimensional DTI and 3-dimensional DTT methods appeared to be reliable for measuring the CST but the 3-dimensional DTT method appeared to be more reliable.
Diffusion Tensor Imaging
;
Diffusion
;
Methods
;
Pyramidal Tracts
6.Alternating Hemiplegia of Childhood in a Person of Malay Ethnicity with Diffusion Tensor Imaging Abnormalities
Ai Huey TAN ; Tien Lee ONG ; Norlisah RAMLI ; Li Kuo TAN ; Jia Lun LIM ; Mohamad Addin AZHAN ; Azlina AHMAD-ANNUAR ; Khairul Azmi IBRAHIM ; Zariah ABDUL-AZIZ ; Laurie J OZELIUS ; Allison BRASHEAR ; Shen Yang LIM
Journal of Movement Disorders 2019;12(2):132-134
No abstract available.
Diffusion Tensor Imaging
;
Diffusion
;
Hemiplegia
;
Humans
7.MR Imaging of Anoperineal Tuberculous Abscess: A Case Report.
Woo Young KANG ; Deuk Jae SUNG ; Na Yeon HAN ; Beom Jin PARK ; Min Ju KIM ; Sung Bum CHO
Journal of the Korean Society of Magnetic Resonance in Medicine 2012;16(2):184-188
Anoperineal tuberculosis is a rare extrapulmonary form of the disease and may present as abscess. We report a case of anoperineal tuberculous abscess, which showed low signal intensity on T1-weighted images, high signal intensity on T2-weighted images and diffusion restriction on diffusion weighted images.
Abscess
;
Diffusion
;
Tuberculosis
8.A Study on the Fiber Tracking Using a Vector Correlation Function in DT-MRI.
Sung Won JO ; Bong Su HAN ; In Sung PARK ; Sung Hee KIM ; Dong Youn KIM
Korean Journal of Medical Physics 2007;18(4):214-220
Diffusion tensor tractorgraphy which is based on line propagation method with brute force approach is implemented and the vector correlation function is proposed in addition to the conventional fractional anisotrophy value as a criterion to select seed points. For the whole tractography, the proposed method used 41% less seed points than the conventional brute force approach for FA > or =0.3 and most of the fiber tracks in the outer region of white matter were removed. For the corticospinal tract passing through region of interest, the proposed method has produced similar results with 50% less seed points than conventional one.
Diffusion
;
Pyramidal Tracts
9.Two Cases of Cerebral Venous Thrombosis with High Signal Intensity of Intravascular Clots on Diffusion Weighted Image.
Sang Won HA ; Sang Eun PARK ; Kyoung Mo AHN ; Ki Moo HONG ; Jeong Seon CHO ; Jeong Ho HAN ; Eun Kyoung CHO ; Doo Eung KIM
Journal of the Korean Neurological Association 2007;25(4):561-564
High signal intensity on diffusion-weighted image (DWI) at the site of venous occlusion has previously been reported in cerebral venous thrombosis (CVT). The frequency and diagnostic value of these signal changes in CVT were unknown. Some authors suggest that the presence of high signal intensity on DWI in occluded veins might help diagnose CVT and suggest low rate of recanalization. We experienced two cases of CVT with high signal intensity at the site of intravascular clot on DWI.
Diffusion*
;
Veins
;
Venous Thrombosis*
10.A Novel GFAP Mutation in Late-Onset Alexander Disease Showing Diffusion Restriction.
Tai Seung NAM ; Jeeyoung OH ; Michael LEVY ; Kyung Wook KANG ; Seok Yong CHOI ; Myeong Kyu KIM
Journal of Clinical Neurology 2017;13(4):426-428
No abstract available.
Alexander Disease*
;
Diffusion*