• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.817-818
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• 2006

In Magnetic Resonance Imaging(MRI), the QRS complex of ECG is used as a trigger signal for MRI scan. But, gradient and RF(radio frequency) artifacts which are caused to static and dynamic field in MRI scanner cause interference in the ECG. Also, the signal shape of theses artifacts can be similar to the QRS-complex, causing possible misinterpretation during patient monitoring and false gating of the MRI. In case of using general FIR or IIR band-pass filters for minimizing the artifacts, artifact-reduction-ratio is not excellent. So, an adaptive real-time digital filter is proposed for reduction of noise by gradient and RF(radio frequency) artifacts. The proposed filter for MRI-Gating is based on the noise-canceller with NLMS(Normalized Least Mean Square) algorithm. The reference signals of the adaptive noise canceller are a combination of the noisy three channel ECG signals. In conclusions, the proposed method showed the acceptable quality of ECG signal with sufficient SNR for gating the MRI and possibility of real time implementation.

• 대한임상독성학회지
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• 제20권2호
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• pp.82-85
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• 2022

Traditionally, most cases of nicotine poisoning have been due to ingestion of nicotine pesticides. However, the increasing use of electronic cigarettes (e-cigarettes) has resulted in both intentional and unintentional exposure to concentrated liquid nicotine or "e-liquid" leading to an increase in nicotine poisoning cases. However, fatalities following the ingestion of the e-liquid are extremely rare. We report a rare case of cardiac arrest and severe encephalopathy following the intentional ingestion of e-liquid. We present the case of a 20-year-old woman who intentionally ingested liquid nicotine intended for e-cigarette use. She was found in asystole and experienced a return of spontaneous circulation (ROSC) after undergoing approximately 46 mins of cardiopulmonary resuscitation. Her plasma nicotine levels were >500 ng/ml. Despite aggressive supportive care, she was found to have encephalopathy consistent with severe anoxic brain injury on magnetic resonance imaging. In recent times, there have been some reports of deaths following liquid nicotine ingestion. Our case illustrates the potential for fatal nicotine toxicity from ingestion of e-cigarettes.

• 대한영상의학회지
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• 제82권5호
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• pp.1321-1327
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• 2021

신경섬유종증 1형은 비교적 흔한 유전 질환이며 신경섬유종 형성, 피부의 색소 이상, 홍채의 리쉬결절 및 골격 이상들을 특징으로 한다. 다발성 피부 신경섬유종은 양성 신경초 종양이며 신경섬유종증 1형의 특징적인 병변이다. 신경섬유종증 1형과 관련된 심장 신경섬유종은 매우 드물며 문헌에 몇 가지 사례가 보고되었다. 이에 저자들은 신경섬유종증 1형을 가진 32세 여성에서 수술로 확진된 좌심실 신경섬유종의 컴퓨터단층촬영 및 자기공명영상 소견을 보고한다.

• 대한핵의학회지
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• 제32권5호
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• pp.433-435
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• 1998

Recent progress of technology permits us to assess ventricular function and wall motion as well as myocardial perfusion using electrocardiographic gated myocardial perfusion single photon emission computed tomography (GM-SPECT). It is interesting that echocardiography and magnetic resonance imaging are moving in the same direction with the use of contrast medium to assess myocardial perfusion. A valid fundamental basis for a new technology is essential for a successful competition. Lee et al. report in this issue the reproducibility of serial measurement of left ventricular function including systolic wall thickening using a novel statistical method. It has important implications such as nitroglycerin or dobutamine application during GM-SPECT. The field of nuclear cardiology must continue to strive toward more sophisticated but straightforward evaluation of cardiac diseases.

• The Korean Journal of Pain
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• 제10권1호
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• pp.127-130
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• 1997

A 67-year old man with a history of cardiac disease underwent epidural catheterization for pain control of postherpetic neuralgia. Patient had severe back pain and pus discharge at catheter insertion site after dischange from medical part. Patient received anticoagulant therapy with $Aspirin^{(R)}$ and $Coumadin^{(R)}$ prescribed for 15 days in medical part. Magnetic resonance imaging(MRI) showed a diffuse $T_{4-7}$ anterior epidural mass compressing the spinal cord. Emergency surgical exploration revealed a thoracic epidural hematoma without abcess formation. Operation was successful and patient recovered satisfactory without any sequelae.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.2031-2032
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• 2011

일반적으로 심장자기공명영상을 이용하여 우관상동맥을 영상화 하기 위해서 3차원 데이터를 얻는다. 그렇게 하는 경우 데이터를 받는 시간이 오래 걸리고, 받은 3차원 데이터에서 차원 원하는 부분만을 2차원으로 재구성하는 작업을 해야 하는 번거러움이 있다. 반면에 호흡 정지상태에서 우관상동맥의 위치를 잘 선택하게 되면 한번 숨을 참을 수 있는 시간안에 원하는 영상을 얻을 수 있는 이점이 있다. 그렇게 하기 위해서는 우관상동맥을 찾아서 그 부분만 영상화해야 하는데, 본 논문에서는 한 영상에 같이 나타내기 어려운 대동맥에서 시작하여 심장 뒤편으로 돌아 들어가는 전체 우관상동맥을 쉽게 찾고, 한번 호흡을 참는 시간안에 영상화 하는 방법을 제안한다.

• Journal of Chest Surgery
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• 제28권8호
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• pp.784-787
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• 1995

A 3-year old female who underwent modified Fontan operation for the double outlet right ventricle with hypoplastic left ventricle at the age of 15 month was admitted with hemoptysis, which was developed 4 days prior to visit. Cardiac catheterization revealed that multiple collaterals from descending thoracic aorta supplied the right lung and drained to the right pulmonary artery. Chest magnetic resonance imaging [MRI showed that the right lung was consolidated by the secondary long-term pulmonary congestion. We decided to perform pneumonectomy because the consolidated right lung and the back-flow from the right pulmonary aretry would worsen the present hemodynamic state of patient. Post-operative course was uneventful, and she could be discharged with good general conditions.

• Journal of Chest Surgery
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• 제53권1호
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• pp.34-37
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• 2020

Cerebral air embolism combined with cardiomyopathy secondary to pulmonary barotrauma is rare. Here, we report an unusual case of cerebral air embolism combined with transient cardiomyopathy secondary to large bulla rupture during a pulmonary function test after lung cancer surgery. The patient experienced loss of consciousness. Computed tomography and magnetic resonance imaging suggested a cerebral air embolism. Electrocardiography showed ST-segment elevation and abnormally high plasma levels of cardiac enzymes. Echocardiography and coronary angiography suggested cardiomyopathy. The patient was discharged with no sequelae.

• Journal of Chest Surgery
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• 제48권1호
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• pp.95-97
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• 2015

We report the case of a 69-year-old woman who was diagnosed with intracardiac schwannoma without symptoms. Preoperative echocardiography and cardiac magnetic resonance imaging showed a mass attached to the interatrial septum. The initial diagnosis was a myxoma or a bronchogenic cyst. The tumor was successfully excised under cardiopulmonary bypass. However, the pathology of the excised tumor was consistent with schwannoma. We suggest that cardiovascular surgeons consider schwannoma to be a possible differential diagnosis for a mass close to the interatrial septum.

• Journal of Chest Surgery
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• 제54권3호
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• pp.232-234
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• 2021

Ependymomas arise from ependymal cells and can grow at any site in the central nervous system (CNS), as well as in some locations outside of the CNS. The latter is rare, contributing to the frequent misdiagnoses of such cases. Herein, we present the case of a 54-year-old man with a history of lower limb weakness and numbness. Magnetic resonance imaging revealed an extradural, heterogeneously enhanced solid lesion with a regular and well-defined border in the posterior mediastinum. A post-resection histopathological examination revealed tumor-forming perivascular pseudo-rosettes that showed immunoreactivity against glial fibrillary acidic protein, epithelial membrane antigen, and vimentin, as well as a high Ki-67 labeling index. Based on pathological features, a diagnosis of anaplastic ependymoma was established.