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A Functional MR Imaging Study of Reading.

Jae Wook RYOO ; Dong Gyu NA ; Hong Sik BYUN ; Dae Seob CHOE ; Chan Hong MOON ; Eun Jeong LEE ; Woo In CHUNG

Journal of the Korean Society of Magnetic Resonance in Medicine.1999;3(1):78-83.

PURPOSE: To evaluate the language areas activated by fMRI during different reading tasks and to assess the difference of activated areas according to each reading task MATERIALS AND METHODS: Functional maps of the language area were obtained during three reading tasks(Korean consonant letter, pseudoword, and word) in nine right-handed volunteers(7 males, 2 females). MR examinations were performed at 1.5T scanner with EPI BOLD technique(gradient echo shot EPI, TR/TE 3000/60, flip angle 90, matrix64 64, 5mm thickness, no slice gap). Each task consisted of three resting periods and two activation periods and each period lasted 30 seconds. We used SPM program for the postprocessing of images and siginficance level was set at p<0.01. Activated areas were topographically analyzed in each stimulus. RESULTS: Significant activated signals were demonstrated in all volunteers. Activated signals were seen in the frontal, temporal, parietal and occipital lobes during reading tasks and they were lateralized to the left hemisphere except occipital lobe. Letter and pseudoword produced stronger activated signals than word, and the activated signals were more lateralized to the left hemisphere in pseudoword reading than in letter reading. CONCLUSION: Activated signals were induced in the language areas by reading task of letter or wordform. Greater activation of language areas was induced when letter or pseuowords were presented than familiar words.
Brain ; Humans ; Magnetic Resonance Imaging* ; Male ; Occipital Lobe ; Rabeprazole ; Volunteers

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Diagnosis of Meniscal Tear of the Knee Using Proton-weighted Fast Spin-Echo MR Imaging: Can be an Alternative to Conventional Spin-Echo Imaging?.

Ki Jun KIM ; Jae Hee LEE ; Jong Kwan JOO ; Sung Yong LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.1999;3(1):73-77.

PURPOSE: The purpose of this study was to evaluate the sensitivity and specificity of proton-weighted fast spin-echo MR imaging in diagnosing the meniscal tear of knee as an reasonable substitute for conventional spin-echo imaging. MATERIALS AND METHODS: 102 consecutive patients, proved by surgery, were participated in this study. All of them were suspected internal derangement of knee, examined by fast spin-echo MR imaging including sagittal and coronal images on a 1.5T MR imager and underwent arthroscopic or open surgery of knee joint within 2 months. These images were reviewed retrospectively by three radiologists. The sensitivity and specificity of meniscal tear were calculated. RESULTS: The sensitivity and specificity of meniscal tear reviewed by proton-weighted fast spin-echo MR imaging were 94%, 93% in medial meniscus and 92%, 88% in lateral meniscus. CONCLUSION: The sensitivity and specificity of meniscal tear using proton weighted fast-spin echo MR images were as high as those using conventional spin-echo MR imaging in diagnosing meniscal tear of the knee.
Diagnosis* ; Humans ; Knee Joint ; Knee* ; Ligaments ; Magnetic Resonance Imaging* ; Menisci, Tibial ; Protons ; Retrospective Studies ; Sensitivity and Specificity

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Primary Hepatic Lymphoma: MR Imaging and Pathologic Correlation.

Hanna KIM ; Yu Ri SHIN ; Sung Eun RHA ; Eun Sun JUNG ; Soon Nam OH ; Joon Il CHOI ; Seung Eun JUNG ; Young Joon LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):151-155. doi:10.13104/jksmrm.2010.14.2.151

Primary hepatic lymphoma is extremely rare, representing less than 1% of all extranodal lymphomas. We report MR imaging features and pathologic correlation of a case of primary hepatic lymphoma. MR images showed a large lobulated mass with gradual contrast enhancement, resembling intrahepatic cholangiocarcinoma. However, both hepatobiliary phase image obtained 20 minutes after injection of hepatocyte specific contrast agent and diffusion-weighted image demonstrated characteristic three layered pattern representing viable lymphoma in the outer layer, tumor necrosis in the middle layer and necrotic hepatic parenchyma in the center.
Cholangiocarcinoma ; Hepatocytes ; Liver ; Liver Neoplasms ; Lymphoma ; Necrosis

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Non-Functioning, Malignant Pancreatic Neuroendocrine Tumor in a 16-Year-old Boy: A Case Report.

Se Woong LIM ; Young Hwan LEE ; See Sung CHOI ; Hyun Sun CHO

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):145-150. doi:10.13104/jksmrm.2010.14.2.145

We report the case of a 16-year-old boy with a solid pancreatic mass which proved to be a nonfunctioning, malignant pancreatic neuroendocrine tumor (PNET). In pediatric patients, malignant pancreatic tumors are rare, especially malignant PNET. When dynamic contrast enhanced MRI showed a well enhancing solid pancreatic tumor on arterial and delayed phases and combined with malignant features, such as vascular invasion, invasion of adjascent organs, and lymphadenopathy, we should include malignant pancreatic neuroendocrine tumor in the differential diagnosis of childhood pancreatic tumors.
Adenoma, Islet Cell ; Adolescent ; Child ; Diagnosis, Differential ; Humans ; Lymphatic Diseases ; Neuroectodermal Tumors, Primitive ; Neuroendocrine Tumors

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MR Images and 1H MR Spectroscopy of Enteric Duplication Cyst of the Pancreas in an Adult.

Sung Hee PARK ; Mi Young KIM ; Chang Hae SUH ; Keon Young LEE ; Suk Jin CHOI ; Jae Young CHO

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):139-144. doi:10.13104/jksmrm.2010.14.2.139

Enteric duplications associated with the pancreas are especially uncommon, and the differential diagnosis of pancreatic duplication cysts is often difficult, and may be confused with various cystic lesions of the pancreas. We report a case of pancreatic duplication cyst; present the images and laboratory findings including cyst fluid tumor markers. MR and MRS findings enabled the detection of the location, contour, characteristics of cystic fluid and definition of tissue planes between the lesion and adjacent structures, providing useful information for an accurate surgical approach.
Adult ; Cyst Fluid ; Diagnosis, Differential ; Humans ; Magnetic Resonance Spectroscopy ; Pancreas ; Biomarkers, Tumor

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MR Imaging Findings of Parosteal Lipoma: Case Report.

Hyoung ju BAE ; Suk Joo HONG ; Yelim KIM ; Eun Young KANG ; Hak Jun KIM ; Young Jun RYU ; Woon Yong JUNG

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):134-138. doi:10.13104/jksmrm.2010.14.2.134

Parosteal lipoma is a rare benign tumor containing mature adipose tissue having an intimate relationship to the periosteum. Characteristically, this tumor presents as a lipomatous mass adjacent to bone, eliciting variable reactive changes in the underlying cortex. We report a case of parosteal lipoma of the foot. The MR findings consisted of juxtacortical lipomatous mass abutting to bony protuberance, with internal fibrous striations, and osseous reaction in the adjacent bone. By the aid of multiplanar imaging capability, high spatial and contrast resolution of MRI, characteristic features of parosteal lipoma can lead to diagnosis on imaging.
Adipose Tissue ; Foot ; Lipoma ; Periosteum

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Three-Dimensional Brain Surface Rendering Imaging of Cortical Dysplasia.

Seung Bae HWANG ; Hyo Sung KWAK ; Sang Yong LEE ; Gong Yong JIN ; Young Min HAN ; Gyung Ho CHUNG

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):126-133. doi:10.13104/jksmrm.2010.14.2.126

PURPOSE: The study was to evaluate the localization of the abnormal gyral and sulcal patterns obtained by means of brain surface rendering imaging. MATERIALS AND METHODS: Nineteen patients with cortical dysplasia who underwent brain surface rendering MR imaging were included in this study. We acquired MP-RAGE sequence and created the 3-D surface rendering MR images by using VoxelPlus(R). Anatomical locations and configurations of abnormal gyri and sulci were reviewed. RESULTS: Abnormal gyral and sulcal patterns were seen 18 in 19 patients. The configuration and orientation of affected gyri and sulci were clearly evaluated in the brain surface rendering images. In a lissencephaly, the a cortex was not delineated and showed markedly thick and smooth gyral pattern. In a schizencephaly, there were wheel shaped broad gyral pattern around the cleft. In a hemimegalencephaly, an affected hemisphere were enlarged and displayed thick and wide gyral pattern. In CBPS, the insular cortex was exposed and the gyri of the lesion were thickened. In focal cortical dysplasia, there were irregular serrated or thick and enlarged gyri. CONCLUSION: Brain surface rendering MR imaging is useful for the evaluation of a detailed gyral pattern and accurate involvement site of abnormal gyri.
Brain ; Humans ; Lissencephaly ; Malformations of Cortical Development ; Orientation

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Clinical Experience of 3T Breast MRI in Detecting the Additional Lesions in Breast Cancer Patients.

Ji Hye LEE ; Sung Hun KIM ; Bong Joo KANG ; Jae Jeong CHOI ; Ah Won LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):121-125. doi:10.13104/jksmrm.2010.14.2.121

PURPOSE: The purpose of this study was to evaluate the diagnostic accuracy of 3.0-T breast MRI for detecting additional breast cancer soon after the initial diagnosis of breast cancer. MATERIALS AND METHODS: From March to June 2009, 101 patients recently diagnosed breast cancer underwent breast MRI and surgery. Parameters analyzed on MRI were total extent of tumor, suspicious findings of multifocal, multicentric, or contralateral cancer. The diagnosis of MRI-detected cancer was confirmed by means of biopsy or surgical specimen evaluation after the localization. RESULTS: MRI showed 37 additional suspicious findings in 34 patients. Twenty nine findings were true-positive (29/37, 78.4%), including 16 cases of multifocality, 11 cases of multicentricity and 2 cases of contralateral cancer. Among these cancers, 13 (44.8%) were ductal carcinoma in situ (DCIS) and 16 (55.1%) were infiltrating cancer. Eight findings were false-positive (8/37, 21.6%) including 6 cases of benign disease and 2 cases of high-risk lesions. CONCLUSION: In women with recently diagnosed breast cancer, 3.0-T MR imaging showed additional suspicious findings in 33.7%. The sensitivity and specificity for detecting additional breast cancer was 100% and 89.3%, respectively.
Biopsy ; Breast ; Breast Neoplasms ; Carcinoma, Intraductal, Noninfiltrating ; Female ; Humans ; Magnetic Resonance Imaging ; Sensitivity and Specificity

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Low Frequency Fluctuation Component Analysis in Active Stimulation fMRI Paradigm.

Sung Min NA ; Hyun Jung PARK ; Yongmin CHANG

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):115-120. doi:10.13104/jksmrm.2010.14.2.115

PURPOSE: To separate and evaluate the low frequency spontaneous fluctuation BOLD signals from the functional magnetic resonance imaging data using sensorimotor active task. MATERIALS AND METHODS: Twenty female archery players and twenty three control subjects were included in this study. Finger-tapping task consisted of three cycles of right finger tapping, with a subsequent 30 second rest. Blood oxygenation level-dependent (BOLD) data were collected using T2*-weighted echo planar imaging at a 3.0 T scanner. A 3-D FSPGR T1-weighted images were used for structural reference. Image processing and statistical analyses were performed using SPM5 for active finger-tapping task and GIFT program was used for statistical analyses of low frequency spontaneous fluctuation BOLD signal. RESULTS: Both groups showed the activation in the left primary motor cortex and supplemental motor area and in the right cerebellum for right finger-tapping task. ICA analysis using GIFT revealed independent components corresponding to contralateral and ipsilateral sensorimotor network and cognitive-related neural network. CONCLUSION: The current study demonstrated that the low frequency spontaneous fluctuation BOLD signals can be separated from the fMRI data using finger tapping paradigm. Also, it was found that these independent components correspond to spontaneous and coherent neural activity in the primary sensorimotor network and in the motor-cognitive network.
Cerebellum ; Echo-Planar Imaging ; Female ; Fingers ; Humans ; Magnetic Resonance Imaging ; Motor Cortex ; Oxygen

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Development of a Korean Standard Structural Brain Template in Cognitive Normals and Patients with Mild Cognitive Impairment and Alzheimer's Disease.

Min Ji KIM ; Geon Ho JAHNG ; Hack Young LEE ; Sun Mi KIM ; Chang Woo RYU ; Won Chul SHIN ; Soo Yeol LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.2010;14(2):103-114. doi:10.13104/jksmrm.2010.14.2.103

PURPOSE: To generate a Korean specific brain template, especially in patients with Alzheimer's disease (AD) by optimizing the voxel-based analysis. MATERIALS AND METHODS: Three-dimensional T1-weighted images were obtained from 123 subjects who were 43 cognitively normal subjects and patients with 44 mild cognitive impairment (MCI) and 36 AD. The template and the corresponding aprior maps were created by using the matched pairs approach with considering differences of age, gender and differential diagnosis (DDX). We measured several characteristics in both our and the MNI templates, including in the ventricle size. Also, the fractions of gray matter and white matter voxels normalized by the total intracranial were evaluated. RESULTS: The high resolution template and the corresponding aprior maps of gray matter, white matter (WM) and CSF were created with the voxel-size of 1 x 1 x 1 mm. Mean distance measures and the ventricle sizes differed between two templates. Our brain template had less gray matter and white matter areas than the MNI template. There were volume differences more in gray matter than in white matter. CONCLUSION: Gray matter and/or white matter integrity studies in populations of Korean elderly and patients with AD are needed to investigate with this template.
Aged ; Alzheimer Disease ; Brain ; Diagnosis, Differential ; Humans ; Mild Cognitive Impairment

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