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        • KCI등재

          동맥경화성 폐쇄성혈관질환의 경피경관 혈관성형술

          정용연 대한영상의학회 1991 대한영상의학회지 Vol.27 No.5

          In order to evaluated the efficacy of percutaneous transluminal angioplasty(PTA) in the treatment of atherosclerotic obstructive disease in the lower extremities, the results of the procedure were retrospectively analyzed for 36 lesions in 27 patients. The 36 lesions were at 23 sites in the iliac arteries and 13 sites in the femoro-popliteal arteries. The overall initial success rate was 89%. The initial success rate was 91% for the iliac artery and 85% for the femoro-popliteal artery. Complications were hematoma(1 case) at the puncture site and arterial wall dissection(1 case), but they did not necessitate emergency intervention. PTA is considered to be an effective treatment of atherosclerotic obstructive disease.

        • KCI등재

          성인에서 발생한 석회화성 중배엽성 신종: 1예 보고$^1$

          정용연,강형근,Jeong,,Yong-Yeon,Gang,,Hyeong-Geun 대한영상의학회 2002 대한영상의학회지 Vol.46 No.3

          중배엽성 신종은 신생아에서 흔하지 않게 보고되고 있으며, 성인에서 발생한 경우는 매우 드물다. 저자들은 성인에서 종괴 내부에 석회화를 동반하고 있어 신세포암과 감별이 어려운 중배엽성 신종 1예를 보고하는 바이다. Mesoblastic nephroma is an uncommon renal tumor reported in infants but rarely in adults. We describe a case of calcified mesoblastic nephroma occurring in an adult. It is difficult, on the basis of radiologic images, to differentiate between calcified mesoblastic nephroma and calcified renal cell carcinoma.

        • KCI등재후보SCOPUS

          MR Imaging Findings of Clonorchiasis

          정용연,강형근,김진웅,윤웅,Tae,Woong,Chung,Seog,Wan,Ko 대한영상의학회 2004 Korean Journal of Radiology Vol.5 No.1

          Clonorchiasis is an important parasitic disease of the bile ducts caused by chronic infestation of Clonorchiasis sinensis following ingestion of raw freshwater fish flesh in East and South-east Asia (1, 2). Clonorchiasis is one of the most frequent causes of cholangiocarcinoma and cholangitis in endemic countries, and therefore its early diagnosis is critical for the prevention of complications (3 5). Several reports have described the radiological features of clonorchiasis on holangiography, ultrasonography and CT (6 10). MR imaging has been used in the diagnosis of various diseases of the biliary system, and MR cholangiography (MRC) is a relatively new noninvasive type of imaging for evaluation of the extrahepatic biliary pathology (i.e. strictures, stones, and obstruction). MR cholangiography is generally comparable with endoscopic retrograde cholangiopancreatography (ERCP) for the demonstration of segmental and peripheral intrahepatic bile ducts, and may show intrahepatic ductal abnormalities in a comparable fashion to that of ERCP (11 14). To our knowledge, only one radiological report has briefly reviewed the MR findings of clonorchiasis (15). The purpose of our study was to evaluate the MR imaging and MRC findings of clonorchiasis.

        • KCI등재

          자궁 경부암이 있는 가임기 여성에서 방사선치료 전후 자기공명영상에서 난소의 변화

          정용연,강형근,임효순,윤웅,정태웅,서정진,Jeong,,Yong-Yeon,Gang,,Hyeong-Geun,Im,,Hyo-Sun,Yun,,Ung,Jeong,,Tae-Ung,Seo,,Jeong-Jin 대한영상의학회 2001 대한영상의학회지 Vol.45 No.6

          목적: 자궁 경부암을 가진 가임기 여성에서 방사선 치료 전후 난소의 변화를 자기 공명(Magnetic Resonance, MR)영상에서 알아보고자 하였다. 대상과 방법: 자궁경부암이 있는 가임기 여성에서 방사선치료를 하고 치료 전과 후에 MR 검사를 시행한 33명을 대상으로 하였다. 총 방사선 조사량은 평균 11,279cGy (체외 평균:5,352 cGy, 체내 평균:5,927 cGy)였다. MR 추적 영상은 치료 도중(n=29)혹은 치료 후(n=4)에 얻었다. MR 영상은 환자의 횡단면 T1 강조영상, 횡단면과 시상면 T2강조영상을 얻었다. 두 명의 방사선과 의사의 합의 하에 난소의 존재 유무, 난소의 크기, 난소당 낭종의 수와 난소의 수질과 피질의 구역 구분 유무를 분석하였다. 결과: 모든 환자는 월경의 소실이 있었다.방사선치료 전 MR 영상에서는 94%(62/66), 치료 후 MR 영상에서는 39%(26/66)에서 난소가 발견되었다(p <.05). 난소의 평균 크기는 방사선치료 전 2.6 $\times$1.9 $\times$2.2 cm, 치료 후에는 1.7 $\times$1.3 $\times$1.4 cm 였다(p <.05). 난소 당 낭종의 수는 방사선치료 전 평균 5.1개, 치료 후 평균 3.1개였다(p <.05). T2강조영상에서 난소의 구역 구분은 방사선치료 전 74%(46/62), 치료 후에는 15%(4/26)에서 가능하였다(p <.05). 결론: 자궁 경부암 환자에서 방사선 치료 후 난소 발견율 및 크기가 감소하였고, 난소의 구역 구분이 불가능해진 경우가 많았다. 이는 정상적인 폐경기 난소의 변화와 유사하며 MR 영상이 방사선 치료후 난소의 구조적 변화를 반영할 수 있다고 생각된다. Purpose: To investigate changes in the ovary revealed by MR imaging before and after radiotherapy in premenopausal patients with cervical carcinoma. Materials and Methods: Thirty-three premenopausal patients with cervical carcinoma underwent radiation therapy at an average dosage of 11,279 (external: 5,352; internal: 5,927) cGy. Before and after this therapy, all underwent pelvic MR imaging using a 1.5T MR scanner (GE Medical Systems, Milwaukee, U.S.A.). The average interval of follow-up MR imaging was 7.2 months, and axial T1-weighted and axial and sagittal T2-weighted MR images were obtained. The presence, size number of follicles, and differentiation of the zonal anatomy of the ovary were determined by two radiologists, who reached a consensus. Results: After radiation therapy, all patients ceased menstruation. For ovaries, the detection rates before and after radiation therapy were 94% (62/66) and 39% (26/66) (p<0.05), respectively, and average ovary size was 2.6${\times}$1.9${\times}$2.2 cm before and 1.7${\times}$1.3${\times}$1.4 cm after therapy (p<0.05). The average number of ovarian follicles before and after therapy was 5.1 and 3.1, respectively (p<0.05). T2-weighted imaging, demonstrated differentiation of zonal anatomy in 74% of cases (46/62) before radiotheraphy, and 15% (4/26) after (p<0.05). Conclusion: Our study has shown that after radiation therapy in premenopausal patients with cervical cancer, detection rates, average size, and the number of ovaries decreased, findings which are similar to those for normal postmenopausal ovary. MR imaging can reveal structural change in ovaries.

        • KCI등재
        • KCI등재

          간동맥 Multidetector-row CT 혈관조영술: 고식적 혈관조영술과 비교

          정용연,윤웅,김재규,박진균,서정진,강형근,Jeong,,Yong-Yeon,Yun,,Ung,Kim,,Jae-Gyu,Park,,Jin-Gyun,Seo,,Jeong-Jin,Gang,,Hyeong-Geun 대한영상의학회 2003 대한영상의학회지 Vol.48 No.3

          목적: 간동맥의 해부학을 평가하는데 있어서 Multidetector now CT(MDCT)를 이요한 삼차원 CT 혈관조영술의 유용성을 알아보고자 하였다. 대상과 방법: 간동맥화학색전술을 받기 위하여 고식적 혈관조영술과 MDCT를 같이 시행한 45 예를 대상으로 하였다. 사용된 CT기기는 MDCT(Lightspeed Qx/I, GE Medical systems, Milwaukee)로, 촬영조건은 초기동맥기를 절편두께(slice thickness) 2.5 mm, 테이블 이동속도 7.5 mm/rotation, pitch 3으로 하여 얻었다. 초기동맥기 영상은 한명의 방사선과 의사에 의해서 최대투시강도 기법을 이용하여 삼차원 CT 혈관조영술을 얻었다. 고식적 혈관조영술 소견을 모르는 두 명의 방사선과 전문의가 각각 독립적으로 간동맥의 형태와 영상의 질을 분석하였다. 결과: 삼차원 CT 혈관조영술에서 간동맥의 해부학적 평가는 방사선과의사 A는 총 45예중 38예(84%)에서, 방사선과의사 B는 40예(89%)에서 일치하게 평가하였다. 두 방사선과의사간 상호일치도(interobserver agreement)는 Kappa value가 0.73으로 우수하였다. 영상의 질은 두 방사선과의사 모두 우수하게 평가하였다. 결론: MDCT를 이용한 삼차원 CT 혈관조영술은 간동맥의 해부학적 구조를 정확히 진단할 수 있으며, 두 명의 방사선과의사간에 상호일치도가 우수하여 고식적 혈관조영술의 시술전의 환자에서 간동맥의 해부학적 변이에 관한 정보를 제공하리라 생각한다. Purpose: To determine the usefulness of three-dimensional CT angiography using multidetector-row CT (MDCT) for delineating the arterial anatomy of the liver. Materials and Methods: Hepatic arterial three-dimensional CT angiography was performed using MDCT (Lightspeed Qx/I; GE Medical Systems, Milwaukee, Wis., U.S.A.) in 45 patients with HCC undergoing conventional angiography for transcatheter hepatic arterial chemoembolization. The scanning parameters during the early arterial phase were 2.5 mm slice thickness, 7.5 mm rotation of table speed, and a pitch of 3. Images were obtained by one radiologist using maximum intensity projection from axial CT images obtained during the early arterial phase. Two radiologists blinded to the findings of conventional angiography independently evaluated the hepatic arterial anatomy and the quality of the images obtained. Results: Compared with conventional angiography, reader A correctly evaluated the hepatic arterial anatomy depicted at three-dimensional CT angiography. Reader B's evaluation was correct in 40 of 45 patients. Interobserver agreement was good (kappa value, 0.73), and both readers assessed the quality of three-dimensional CT angiography as excellent. Conclusion: Three-dimensional CT angiography using MDCT was accurate for delineating the arterial anatomy of the liver, and interobserver agreement was good. The modality may provide, prior to conventional angiography, valuable information regarding a patient's hepatic arterial anatomy.

        • KCI등재

          뇌종양의 병기결정에서 자기공명영상의 유용성:가토를 이용한 실험 모델과 임상 증례 비교

          정용연,강형근,서정진,김윤현,박진균,김재규,정현대,오종석,이민철 대한영상의학회 1997 대한영상의학회지 Vol.37 No.6

          Purpose:The purpose of this study is to evaluate th usefulness of MR imaging in the staging of brain abscesses and to determine the correlations between pathologic and MR findings. Materials and Methods: Experimental brain abscesses were induced by direct inoculation of 1ml suspension of $10^6$/ml Streptococcus pneumoniae into the brain parenchyma of ten New Zealand white rabbits. The evolution of abscess formation was divided inro four stages, based on pathological, criteria : early cerebritis (days 1 to 5), late cerebritis )days 6 to 10), early capsular (days 11 to 15), and late capsular (day 16 and later). The brain abcsess of each animal was exmained by MR imaging and light microscopy at 3, 8, 13, and 28 days;T1-weighted, T2-weighted and Gd-enhanced images were obtained. The MR images and pathologic findings of 13 pathologically confirmed clinical cases were compared to MR images of the experimental model. Results:In the experimental model, signal intensity of the abcsess content was at all stages hypointense on T1-weighted and hyperintense on T2-weighted images. In all ten cases, Gd-enhanced images showed an ill-defined contrast-enhanced leison at the early cerebritis stage, and in four of seven cases, irregular ring enhancement at the late cerebritis stage. Pathologic specimens at this latter stage revealed prominent vascular proliferation and infiltration to chronic inflammatory cells. Signal intensity of the abscess wall during the capsular stage showed isointense relative brain parenchyma on T1-weighted images and this was hypointense on T2-weighted images. Gd-enhanced images demonstrated smooth ring enhancement of the abscess wall. At the early capsular stage, pathologic specimens revealed a discrete necrotic center surrounded by infiltration of reticulin and some collagen;at the late capsular stage, these specimens showed marked infiltration of collagen. In clinical cases, the signal intensity of abscess content was at all stages demonstrated ill-defined subtle contrast enhancement at the early cerebritis stage and irresular ring enhancement at the late cerebritis stage. In all cases, signal intensity of the abscess wall during the capsular stage was hypointense on T2-weighted images;at this stage, the abscess wall was showed a pattern of smooth ring enhancement. In clinical cases, hypointensity of the abscess wall, as seen on T2-weighted images, and the enhancement pattern of this wall were identical to these findings in the experimental model. Conclusion:In an experimental model, correlation between sequential MR findinds can be used to predict the stage of a brain abscess;in clinical cases essential indicators are hypointensity and enhancement pattern of the abscess wall, as seen on T2-weighted images. In cases of brain abscess, MRI is a useful diagnostic modality, and in such cases, also helps determine the most suitable treatment.

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