슬내장 : 자기공명영상 진단의 정확도

안중모 대한영상의학회 1993 대한영상의학회지 Vol.29 No.4

Recent technological advances have made magnetic resonance images (MR) of the knee a clinical reality. MR is rapidly replacing the conventional arthrography as the imaging modality of choice of the knee joints. To evaluate the diagnostic accuracy of MR in the internal derangement of the knee, MR findings of 244 menisci and 488 ligaments of 122 knees were correlated with those of subsequent arthroscopy or surgery in all cases. The sensitivity, specificity, and accuracy of MR diagnosis for the medial meniscus were 87%, 93%, 91%, for the lateral meniscus 91%, 95%, 93%, for the anterior cruciate ligament 80%, 97%, 92%, for the posteriior cruciate ligamant 73%, 99%, 97%, for the medial collateral ligament 67%, 100%, 99%, for the lateral collateral ligament 100%, 100%, and 100%. These results imply that MR is an excellent diagnostic modality in the preoperative evaluation of clinically suspected internal derangement of the knee.

척추 압박골정의 자기공명영상 : 급성 및 만성 외상과 전이성 압박골절의 비료 - 신 호 강도와 조영 증강을 중심으로 -

안중모 대한영상의학회 1993 대한영상의학회지 Vol.29 No.5

Magnetic resonance (MR) imaging was performed in 41 patients with compression fracture of the spine. MR images of 14 patients with acute spinal trauma (within recent 1 month), eight patients with chronic trauma (over 1 month) and 19 patients with malignant cause without history of trauma were analyzed, retrospectively. Low signal intencities on T1-weighted images and high signal intensities on T2- weighted images were noted in 86% (12/14) of patients with acute trauma. Iso-signal intensities on all pulse sequences were noted in 50%(4/8) of patients with chronic trauma showed enhancement. Fragmentation was seen in 35%(5/14) of patients with acute trauma, in 25% (2/8) with chronic trauma, and not seen in the patients with metastasis. In conclusion, acute traumatic compression fracture can not be differentiated from malignant cause by MR signal intensity or contrast enhancement, but chronic compression fracture can be distinguished from metasasis. Fragmentation may suggest traumatic compression fracture. So, MRI could be a useful mehtod in differentiating the benign compression fractures from the pathologic ones caused by malignancy.

뇌 전이암의 자기공명영상 소견

안중모 대한영상의학회 1993 대한영상의학회지 Vol.29 No.3

The purpose of this study is to describe the magnetic resonance imaging (MR) findings of metastatic brain tumors with emphasis on the signal intensities of the lesion on MR. Thirty four patients with intracranial metastases were studies with MR imaging. The diagnosis was established on the basis of either brain biopsy or combination of brain MR findings and the presence of primary tumors. The primary tumors include lung cancer (n=18), breast cancer (n=3), stomach cancer (n=3), rectal cacer (n=1), renal cell carcinoma (n=1), hepatocellular carcinoma (n=4), The parenchymal lesions were solitary in 35% (12/34) and multiple in 65% (22/34). The size of the lesions was variable, ranging from several millimeters to 5cm in diameter. The corticomedullar junction of the cerebral heispheres was the most common location of the lesions (68%) The signal intensity of solid portion of the lesions was usually either isointense (44%) or hypointense(29%) on T1-weighted images. whereas it appeared in isointense (47%), hypointense (8%) or hyperintense (11%) on proton density-weighted images, whereas it appeared in isointense (47%), hypointense (8%) or hyperintense (11%) on proton density -weighted or T2-weighted images. The remaining cases showed mixed signal intensities. The enhancement patterns were variable including nodular (<1cm) (6%), homogeneous (19%), heterogenous (10%), ring-like enhancement (22%) or mixed pattern (43%). The size of surrounding edema was larger than the tumor diameter in 76%. In conclusion, although there are no specific MR findings of intracranial metastasis except mulitplicity, intracranial metastasis should be included in differential diagnosis with high priority, when a solitary mass showing isointensity on boty T1-and T2-weighted images with massive surrounding edema, especially in the corticomedullary junction of the cerebral hemispheres is encountered.

풍선 확장술에 의한 결핵성 기관지 협착의 치료

안중모 대한영상의학회 1993 대한영상의학회지 Vol.29 No.3

The purpose of this study is to evaluate the efficacy of the balloon bronchoplasty in the treatment of the tuberculous bronchostenosis. Balloon bronchoplasty was performed in thirteen patients with stenosis of the left main bronchus(two with combined left upper and lower lobar bronchostenosis) using a inflatable balloon catheter under a fluoroscopic guide. We analysed the changes in the severity of dyspnea and wheezing, serial FEV1/FVC as a parameter of the airflow obsturction, and bronchial diameter and lung volume on chest radiographs. The extent of pulmonary tuberculosis was correlated with the improvement of FEV1/FVC. There was an improvement of dyspnea in 69%(9/13), decrease of wheezing in 69%(9/13), significant increase of FEV1/FVC in 18% (2/11) The increase of the bronchial diameter and lung volume were seen in 84%(11/13) and 53%(7/13), respectively. The significant increase of FEV1/FVC was seen in 28% (2/7) of the patients with lung involvement of tuberculosis less than one third of left upper lobe, whereas there was no increase in those of more than one third. There was no complication except transient leukocytosis, fever and blood-tinged sputum. In conclusion, balloon bronchoplasty is effective in the treatment of medically intractable tuberculous bronchostenosis. and can be considered as an initial method of treatment.

특발성 폐섬유화증 환자에서의 CT상 종격동 림프절 확대

안중모 대한영상의학회 1992 대한영상의학회지 Vol.28 No.5

The increase in size of lymph node on CT scan is the single most important finding of lymphadenopathy. The purpose of this study was to evaluate the size of mediastinal lympy nodes in patients with idiopathic pulmonary fibrosis with no evidence of malignancy or current infection. CT scans of 70 patients (16 with conventional CT and 54 with high-resolution CT) were assessed for lymph node size and locations. The duration of symptoms, and the extent and patterns of th parenchymal lung disease on CT scans were correlated with lymph node enlargement. In 54 of 70 patients, more than one lymph nodes were larger than 1-1.5cm. The prevalence of mnode enlargement increased significantly with a longer duration of symptom (p=0.001), larger extent of the disease (p=0.043), and with a greater proportion of honeycomb pattern (p=0033). Right paratracheal, subcarinal, right tracheobronchial, and paraesophageal nodes were the most common sites of node enlargement. In conclusion, mediastinal ly ph node enlargement is common in patients with idiopathic pulmonary fibrosis and is more frequently seen in patients with a longer duration of clinical symptoms, greater extent of the disease, and with a larger proportion of honeycomb pattern.

기관지 확장증의 방사선학적 소견 : 결핵성 및 비결핵성의 비교

안중모 대한영상의학회 1994 대한영상의학회지 Vol.31 No.2

슬관절 인대 손상의 자기공명영상

안중모 대한영상의학회 1992 대한영상의학회지 Vol.28 No.2

To evaluate the value of MR imaging in the examination of ligament injury of the knee. we rretrospectively analysed the MR images of 61 injured knees of 60 patients. The presence of tear was determined by arthroscopy in all cases. Anterior/pasterior curciate ligaments (ACL/PCL) were demonstrated by sagittal images, Medial/lateral collateral ligaments(MCL/LCL) were evaluated on coronal images. The diagnostic accuracy were 91.8%, 96.7%, and 100% for ACL,PCL, and MCL respectively. The specificity for the lateral collateral ligament was 100% It is concluded that magnetic resonance imaging is an accurate method in detecting injury of the ligaments of the knee.

슬관절 색소융모결절성 활막염의 자기공명영상

안중모 대한영상의학회 1994 대한영상의학회지 Vol.31 No.1

X밴드 개구결합 마이크로스트립 원형편파 안테나

안중모 ( Jung Mo Ahn ),서용석 ( Yong Seok Seo ),정진우 ( Jin Woo Jung ),이현진 ( Hyeon Jin Lee ),임영석 ( Yeong Seog Lim ) 전남대학교 전자통신기술연구소 2008 전자통신기술논문지 Vol.11 No.1

본 논문은, 개구결합 안테나의 마이크로스트립 선로를 L형태로 변형하였고, 슬롯의 위치는 선로의 끝단으로부터 λg/4 지점에 위치한다. T-Junction으로부터 수직, 수평선로의 길이차이를 λg/4로 하여 원형편파를 얻을 수 있는 X밴드의 소형 마이크로 스트립 안테나를 제안하였다. 제안된 안테나를 HFSS 해석기를 이용하여 해석하였으며, 파라미터 값을 최적화 하였다. 그 결과 반사계수는 -10dB를 기준으로 9.28GHz~10.26GHz까지의 980MHz의 대역폭과 원형 편파에 의한 대역은 350MHz의 대역폭을 갖으며, 최대 이득은 5.09dBi을 얻었다. In this paper, we changed microstrip line of aperture coupled antenna to L type and located slot in λg/4 where its end from the line. We suggested small-sized microstrip antenna of X-band, which can achieved with difference of λg/4 length, between horizon and a perpendicular line from T-junction. The suggested antenna was analyzed by using HFSS analyzer and parameters were optimized. For result reflection coefficient is to 9.28GHz~10.26GHz base -10dB with 980MHz bandwidth and 350MHz bandwidth by circularized polarization, and acquired 5.09dBi of maximum gain.

거골하 유합: 측면 방사선 사진에서 C징후의 유용성

김성현,안중모,김성문,이민희,윤혜경,신명진,강홍식 대한영상의학회 2001 대한영상의학회지 Vol.44 No.5

목적: 거골하 유합의 진단에 있어 측면 방사선 사진에서 거-종골 C징후의 유용성을 알아보고자 하였다. 대상과 방법: 거골하 유합으로 진단된 11명, 12예 (1명에서는 양측성)을 대상으로 하였다 거를 하 유합은 수술 (n=6)과 CT또는 MR (n=6)로 확진하였고, 측면 방사선 사진을 분석하여 거-종골 C징후의 유무를 분석하였다. 결과: 거-능골 C징후는 모든 예에서 관찰되었는데 6예는 연속적이었고 6예는 불연속적이 떴다. 거골하 유합은 2예에서 중간 거골하 관절(middle subtalar joint)과 후 거골하 관절(posterior Subtalar joint)을 같이 침범하였고, 6예에서 후 거골하 관절을 그리고 4예에서 중간 거골하 관절을 침범하였다. 수술을 시행 받은 6예에서 거골하 유합은 모두 골 유합과 비 골 유합 (연골 및 섬유 유합)의 혼합으로 이루어졌고 1예에서 중간 거골하 관절에 골교가 보였다. CT 및 MR로 확진된 6예 중 1예는 거골하 유합이 골 유합과 비 골 유합의 혼합으로 이루어졌고, 5예는 비 골 유합만으로 이루어졌다. 결론: 족부의 측면 방사선 사진에서 거-종골 C징후는 거골하 유합을 진단하는데 유용한 소견이 라고 생각한다. Purpose: To assess the usefulness of the talocalcaneal C sign in the diagnosis of subtalar coalition, as seen on lateral radiographs of the ankle. Materials and Methods: Lateral radiographs of 12 ankles in 11 patients were included in this study. Twelve subtalar coalitions were confirmed by surgery (n=6), or by CT and/or MR (n= 6). The presence of the talocalcaneal C sign on lateral ankle radiographs was determined. Results: The C sign was continuous in six feet and interrupted in the remaining six. Subtalar coalition occurred simultaneously in the middle and posterior subtalar joints in two cases, the posterior subtalar joint only in six, and in the middle subtalar joint only in four. In six cases confirmed at surgery, subtalar coalitions consisted of both synostosis and non-osseous fusion (synchondrosis and/or syndesmosisl and in one case of middle subtalar coalition, there was a bony bridge. The remaining six cases, confirmed at CT or MRI, involved both synostosis and non-osseous fusion (n = 1) or non-osseous fusion only (n = 5). Conclusion: In the diagnosis of subtalar coalition, the talocalcaneal C sign, seen on lateral radiographs of the ankle, is a useful indicator