• Title/Summary/Keyword: Diffusion magnetic resonance

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Bone Involvement of Diffuse Large B Cell Lymphoma (DLBCL) Showing Unusual Manifestations Mimicking Chronic Osteomyelitis in a 58-Year-Old Man: Case Report and Clinical Application of Diffusion Weighted Magnetic Resonance Imaging

  • Lee, Kyung Ryeol;Maeng, Young Hee
    • Investigative Magnetic Resonance Imaging
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    • v.23 no.3
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    • pp.270-275
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    • 2019
  • This study presents a case of diffuse large B cell lymphoma (DLBCL) in a 58-year-old man showing unusual manifestations mimicking chronic osteomyelitis. In this case review, we describe the imaging findings of DLBCL which mimics chronic osteomyelitis and review existing reports regarding the differential diagnosis of bone involvement of lymphoma and osteomyelitis through imaging and laboratory findings and diffusion-weighted magnetic resonance imaging (DWI) such as the advanced MRI sequence.

Magnetic Resonance Neurography Using the Anisotropy of Diffusion Coefficients (확산계수의 이방성을 이용한 자기공명 신경망조영술)

  • Lee, Su-Yeol;Mun, Chi-Ung;Im, Tae-Hwan
    • Journal of Biomedical Engineering Research
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    • v.15 no.4
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    • pp.401-406
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    • 1994
  • A magnetic resonance neurography technique for exclusive imaging of nerve networks is proposed. In the proposed technique, the anisotropy of diffusion coefficients of the molecules inside nerve cells was utilized to effectively suppress the magnetic resonance signal radiating from ones other than nerve tissues. Two images were obtained with diffusionweighting magnetic field gradients applied in the parallel and perpendicular directions with respect to the nerve orientation. One image was then subtract- ted from the other to form the neurogram. Experimentally obtained neurograms of the squld are presented.

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Clear Cell Sarcoma of the Wrist: MRI Findings with Diffusion-Weighted Image and Histopathologic Correlation

  • Chung, Bo Yong;Lee, Seun Ah;Choi, Jung-Ah;Shim, Jung-Weon
    • Investigative Magnetic Resonance Imaging
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    • v.20 no.2
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    • pp.136-139
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    • 2016
  • Clear cell sarcoma is rare and difficult to diagnose. Herein, we present a case of clear cell sarcoma in the dorsum of the wrist with MRI findings, including diffusion-weighted imaging, and histopathologic correlation, which was initially diagnosed as giant cell tumor of tendon sheath.

Viscosity and Volume Effects on Convective Flows in PGSE-NMR Self-Diffusion Measurements at High Temperature

  • Seo, Ji Hye;Chung, Kee-Choo
    • Journal of the Korean Magnetic Resonance Society
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    • v.16 no.2
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    • pp.122-132
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    • 2012
  • The effects of the sample viscosity and volume on the convective flows induced by temperature gradient in PGSE-NMR self-diffusion measurements at high temperature have been investigated. The experimental results showed that the viscosity of the liquid sample strongly affects the magnitude of the convective flows as well as the diffusion coefficient itself. It was also found that the convective flows increase as the sample volume increase.

Quantification of Methanol Concentration in the Polymer Electrolyte Membrane of Direct Methanol Fuel Cell by Solid-state NMR

  • Kim, Seong-Soo;Paik, Youn-Kee;Kim, Sun-Ha;Han, Oc-Hee
    • Journal of the Korean Magnetic Resonance Society
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    • v.12 no.2
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    • pp.96-102
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    • 2008
  • Direct quantification of methanol in polymer electrolyte membrane (PEM) by solid-state nuclear magnetic resonance (NMR) spectroscopy was studied and the methanol concentrations in PEM produced by crossover and diffusion were compared. The error range of the quantification was not smaller than ${\pm}15%$ and the amount of the methanol crossed over in our direct methanol fuel cells (DMFCs) was less than the methanol diffused to PEM. The methanol concentration in the PEM of the DMFC operated at different current densities were equivalent.

Review of Recent Advancement of Ultra High Field Magnetic Resonance Imaging: from Anatomy to Tractography

  • Cho, Zang-Hee
    • Investigative Magnetic Resonance Imaging
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    • v.20 no.3
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    • pp.141-151
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    • 2016
  • Purpose: Advances of magnetic resonance imaging (MRI), especially that of the Ultra-High Field (UHF) MRI will be reviewed. Materials and Methods: Diffusion MRI data was obtained from a healthy adult young male of age 30 using a 7.0T research MRI scanner (Magnetom, Siemens) with 40 mT/m maximum gradient field. The specific imaging parameters used for the data acquisition were a single shot DW echo planar imaging. Results: Three areas of the imaging experiments are focused on for the study, namely the anatomy, angiography, and tractography. Conclusion: It is envisioned that, in near future, there will be more 7.0T MRIs for brain research and explosive clinical application research will also be developed, for example in the area of connectomics in neuroscience and clinical neurology and neurosurgery.

Brain Mapping Using Neuroimaging

  • Tae, Woo-Suk;Kang, Shin-Hyuk;Ham, Byung-Joo;Kim, Byung-Jo;Pyun, Sung-Bom
    • Applied Microscopy
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    • v.46 no.4
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    • pp.179-183
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    • 2016
  • Mapping brain structural and functional connections through the whole brain is essential for understanding brain mechanisms and the physiological bases of brain diseases. Although region specific structural or functional deficits cause brain diseases, the changes of interregional connections could also be important factors of brain diseases. This review will introduce common neuroimaging modalities, including structural magnetic resonance imaging (MRI), functional MRI (fMRI), diffusion tensor imaging, and other recent neuroimaging analyses methods, such as voxel-based morphometry, cortical thickness analysis, local gyrification index, and shape analysis for structural imaging. Tract-Based Spatial Statistics, TRActs Constrained by UnderLying Anatomy for diffusion MRI, and independent component analysis for fMRI also will also be introduced.

Bilateral Medial Medullary Infarction Demonstrated by Diffusion-Weighted Imaging : Case Report

  • Jang, Han-Won;Byun, Woo-Mok
    • Journal of Yeungnam Medical Science
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    • v.26 no.1
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    • pp.70-73
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    • 2009
  • A 78-year-old woman presented with weakness of the extremities, dysarthria, dizziness, and sensory impairment. Magnetic resonance imaging showed acute bilateral medial medullary infarction. Contrast enhanced magnetic resonance angiography demonstrated stenosis or occlusion of both intracranial vertebral arteries. We present a rare case of bilateral medullary infarction seen on diffusion-weighted imaging.

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Testicular Epidermoid Cyst on Diffusion-Weighted MR Imaging and ADC Map : A Case Report (확산강조영상과 현상확산계수(ADC) 영상을 통한 고환 표피 낭종의 진단: 증례 보고)

  • Kim, Mi-Sun;Kim, Kyung-Ah;Chang, Sun-Hee
    • Investigative Magnetic Resonance Imaging
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    • v.15 no.2
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    • pp.154-159
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    • 2011
  • Testicular epidermoid cyst is a rare benign tumor, accounting for 1-2% of all testicular tumors. It can be cured by organ preserving surgery, so accurate preoperative diagnosis is very important for preventing unneccessary and extensive orchiectomy. We experienced a case of an 18-year-old man who presented with a painless lump in his right testis. The testicular mass showed an onion ring sign on ultrasonography. Computed tomography images showed the mass as a low attenuating lesion with curvilinear calcification. On Magnetic resonance imaging (MRI), the mass appeared as high signal intensity with internal alternating low signal intensity patterns on T2-weighted images. The mass was displayed as having homogeneous high signal intensity on diffusion magnetic resonance imaging and showed lower apparent diffusion coefficient values than normal testis parenchyma, similar to intracranial epidermoid cysts. Testicular MRI with DWI and ADC map can help to more accurately diagnose testicular epidermoid cyst.