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정상인 경수에 대한 확산텐서영상과 PC기법을 이용한 뇌척수액 속도 측정에 관한 연구
손봉경,곽소영,한용희,유장선,김옥화,고현윤,문치웅 대한자기공명의과학회 2013 Investigative Magnetic Resonance Imaging Vol.17 No.2
목적 : 정상인 경수에 대한 내부 부위별, 경수 레벨별 확산텐서영상과 뇌척수액 속도에 대한 정상인 기준을 마련하고자 하였다. 대상 및 방법 : 정상인을 대상으로 3T MRI를 이용하여 영상을 획득하였다. 확산텐서영상은 척수 레벨별로 각각 미리 정의해둔 백질의 후삭, 좌, 우 측삭과 회백질에 관심영역을 정하여 FA, MD에 대한 평균값을 구하였다. PC 기법을 이용한 뇌척수액속도 측정은 C2-3, C4-5, C5-6 척수레벨을 각각 스캔한 후, 척수 레벨별 최대 수축기 및 이완기 속도를 측정하였다. 결과 : FA 값과 MD 값에서 회백질과 백질의 내부 구조 사이에서는 통계적으로 유의한 차이 (p < 0.05)를 보였다. 경수 레벨별에서는 회백질의 FA 값에서 통계적으로 유의한 차이(p < 0.05)를 보였으며, 나머지 부분에서는 통계적으로 유의한 차이를 보이지 않았다 (p > 0.05). 뇌척수액 속도 측정 결과, 평균 최대 수축기 속도 5.18 ± 2.00 cm/sec, 평균 최대 이완기속도 -7.32 ± 3.18 cm/sec 이었으며, 경수 레벨별로는 통계적으로 유의한 차이를 보이지 않았다 (p > 0.05). 결론 : 정상인에 대한 경수 확산텐서영상의 정량적 수치 및 경수 레벨에 영향을 받지 않는 뇌척수액 속도에 대한 평균치를 알수가 있었다. Purpose : We report the results of the various parameters of diffusion tensor imaging (DTI) and CSF flow study ofthe cervical spinal cord using magnetic resonance (MR) imaging techniques. Materials and Methods: Intramedullary FA and MD were measured in the gray matter and posterior cord of thewhite matter and both lateral cords of the white matter at the C2-3, C4-5, C5-6 spinal levels. For the CSF flowstudy, velocity encoding was obtained at the C2-3, C4-5, C5-6 spinal levels. Results: There was a significant difference of the FA and MD between the white matter and gray matter (p <0.05). The FA of the gray matter was significantly different according to the cervical spinal cord levels (p < 0.05). Otherwise, the FA and MD parameters were not significantly different (p > 0.05). The mean peak systolic velocityand mean peak diastolic velocity were 5.18±2.00 cm/sec and -7.32±3.18 cm/sec, respectively from C2 to C6spinal cords. There was no significant difference in these velocities among the cervical spinal cord (p > 0.05). Conclusion: This basic information about DTI and CSF dynamics of the cervical spinal cord may be useful forassessing cervical spinal cord abnormalities using MR imaging.
K-공간 영상잡음 소거 딥러닝 기술을 이용한 안면부 자기공명영상검사의 영상 품질에 관한 연구
김성건,손봉경,김성진,유장선,정영진,곽종혁 대한자기공명기술학회 2023 대한자기공명기술학회지 Vol.33 No.2
Facial MRI examination is being utilised for anatomical structure identification and disease diagnosis, providing high contrastand resolution of the surrounding tissues. Deep learning, which aims to enhance image quality while reducing examinationtime has gained attention in recent years. In this study, the usefulness of deep learning in facial MRI examination wasinvestigated. Thirty-four patients were included, while both deep learning T2-weighted images and conventional T2-weightedimages were acquired in axial and coronal planes. The images were quantitatively evaluated employing Natural Image QualityEvaluator (NIQE) and Neural Image Assessment (NIMA), as well as qualitatively assessed using a Likert 4-point scale. TheNIQE results indicated that the deep learning T2-weighted images had superior image quality compared with the conventionalT2-weighted images. In terms of NIMA results, no statistically significant difference was found in the axial plane betweenthe two image types, but a statistically significant difference was observed in the coronal plane of the deep learning T2-weightedimages. Qualitative evaluation demonstrated qualitative benefits in the oral and pharyngeal regions. The research findingssuggest that the application of deep learning in areas of the face with unconscious movement can provide higher image qualitythan conventional T2-weighted images. Additionally, deep learning can maintain quality in structures with relatively less motion,reduce examination time by more than two minutes and decrease artefacts caused by movement, thus proving useful in thediagnosis of emergency and uncooperative patients.
녹색 염료 파이핑 라인의 환자 가운에서 발생한 복부 화상 사례 보고
곽종혁,손봉경,유장선,임현화,김성진 대한자기공명기술학회 2023 대한자기공명기술학회지 Vol.33 No.3
This case report presents an MRI artifact image and a case study of an abdominal burn safety accident caused by the use of a green dye contaminated piping line on a patient gown, which was intended for size differentiation and therefore not due to negligence on the part of the radiographer conducting the examination. Chemical dyes are produced using various metals, primarily metal chlorides, and the green dye involved in this burn incident mainly contained copper, chromium, andiron components with high thermal conductivity. To prevent burn safety accidents, it is necessary to understand the composition of the dye and create a gap between the skin and the patient gown using non-thermally conductive materials such as sponges or cotton pads. This burn case demonstrates that despite rigorous pre-screening procedures, burn safety accidents can occur, highlighting the value of reviewing MRI artifact images in order to take preventive measures against burn safety accidents.
뇌 백질과 회 백질 영역의 확산텐서영상의 비등방도 계측 값 (30-50세 이하의 남성을 대상으로)
곽종혁,손봉경,박현아,유장선 대한자기공명기술학회 2018 대한자기공명기술학회 학술대회 Vol.2018 No.04
Purpose:Korean versions of alcohol use disorders identification test According to the questionnaire score, non– comprehension was classified into appropriate drinking group (below 10 points). After obtaining the brain diffusion tensor image, we present an fractional anisotropy measurement value of normal brain area by TBSS method. Materials and Methods:Subjects were recruited from men aged 30 to 50 years who explained and agreed on the purpose and method of the study from June 1, 2018 to August 31, 2017. The Magnetic Resonance Imaging System(MAGNETOM Skyra 3.0T) was used for the examination. The subjects of this study were 59 non-smokers who belonged to the normal drinking group with a score of 10 or less on the Korean version of the Alcohol Disorders Test (AUDIT-K). After obtaining the brain diffusion tensor image, The fractional anisotropy (FA) values of Nerve fiber of white matter, Lobe region of gray matter, Gyrus region of gray matter, Areas of the basal ganglia of gray matter, and the hippocampus region of gray matter were analyzed using the SPSS 21.0 Version statistical program Technical statistical analysis. Results:While the fractional anisotropy value of the white matter was the highest of 0.7527±0.02481 in posterior of the corpus callosum, it was the lowest of 0.2302±0.04323 in the choroid plexus. In the gray matter region, the FA value of the occipital lobe superior division was the highest with 0.2004 ± 0.00669 and the superior frontal lobe was the lowest with 0.1759 ± 0.00704. The fractional anisotropy values of the Gyrus region were highest at 0.2403±0.00703 in Cingulate gyrus anterior division and lowest at 0.2223±0.00617 in Cingulate gyrus posterior division. FA values of basal ganglia were highest in Lt. globus pallidus of 0.3994±0.01041 and lowest in Rt. caudate nucleus of 0.2116±0.01442. The fractional anisotropy value of the hippocampus area was highest at 0.1827±0.01036 in the para hippocampal gyrus anterior division and lowest in the left hippocampus of 0.1675±0.01136. Conclusion:The fractional anisotropy of the corpus callosum was the highest, and the Lt. globus pallidus of the cerebral gray matter area was also highly fractional anisotropy. It is generally known that the cerebral white matter region has higher fractional anisotropy than the gray matter, but the fractional anisotropy of all white matter regions is not higher than that of the gray matter. The fractional anisotropy measurements of the anatomic diffusion tensor images of the brain white matter and gray matter were presented to normal males aged 30 to 50 years by TBSS(Tract-Based Spatial statistics) method.