Imaging Findings of Mantle Cell Lymphoma Involving Gastrointestinal Tract

정환훈,YunHwanKim,JinHyungKim,차상훈,김백현,Taik-KunKim,AeRheeKim,SeongJinCho 연세대학교의과대학 2003 Yonsei medical journal Vol.44 No.1

경간동맥 색전술후에 발생하는 간위축에 관한 고찰:CT 소견을 중심으로

정환훈 대한영상의학회 1995 대한영상의학회지 Vol.32 No.2

Purpose; Hepatic atrophy has been recognized as a complication of hepatic and biliary disease but we haveoften found it in follow up CT after transcatheter arterial embolization (TACE). The purpose of this study is toevaluate the characteristics of hepatic atrophy after TACE. Material and Methods; Of 53 patients who had TACE, Weevaluated the relationship between the incidence of hepatic atrophy and the number of TACE, and also evaluated theaverage number of TACE in patients with hepatic atrophy. Of 20 patients who had received more than average numberof TACE for development of hepatic atrophy ( 2 times with portal vein obstruction, 2.7 times without portal veinobstruction in this study ), we evaluated the relationship between the lipiodol uptake pattern of tumor and theincidence of hepatic atrophy. Results; There were 8 cases of hepatic atrophy ( 3 with portal vein obstruction, 5without portal vein obstruction ), average number for development of hepatic atrophy were 2.5 times. As the numberof TACE were increased, the incidence of hepatic atrophy were also increased. Of 20 patients who received morethan average number of TACE for development of hepatic atrophy, we noted 6 cases of hepatic atrophy in 11 patientswith dense homogenous lipiodol uptake pattern of tumor and noted only 1 case of hepatic atrophy in 9 patient withinhomogenous lipiodol uptake pattern. Conclusion; Hepatic atrophy was one of the CT findings after TACE evenwithout portal vein obstruction. average number of TACE was 2.5 times and risk factors for development of hepaticatrophy were portal vein obstruction, increased number of TACE, and dense homogenous lipiodol uptake pattern oftumor.

대퇴 동맥 천자에 관한 연구: 서혜부 피부 주름선과 골격 지표의 비교

정환훈,하종수,차상훈,김백현,이기열,김택군,이승화,김정혁,설혜영 대한영상의학회 2006 대한영상의학회지 Vol.54 No.4

나선형 CT를 이용한 문맥조영 CT의 위양성소견에 관한 고찰

정환훈 대한영상의학회 1994 대한영상의학회지 Vol.31 No.6

간세포암 혈관성 검출능의 각 영상검사방법간 비교연구

정환훈,김윤환,김홍인,하종수,김정혁,정규병,서원혁,팔레와트아루나 대한영상의학회 2001 대한영상의학회지 Vol.45 No.2

목적: 결절성 간세포암에 대한 혈관조영술. 삼중시기 나선 7CT. 간동맥조영 CT. 단일평면 역동적 간동맥조영 CT(이하 역동적 간동맥조영 CT로 약함)의 혈관성 검출능을 비교 평가하고자 하였다 대상과 방법: 77명의 환자에서 병리조직학적으로 확진된 79예의 결절성 간세포암을 대상으로하였다. 남자 60예, 여자 17예였으며, 나이는 31-77세(평균 57.4세)였다. 간세포암의 크기는 2cm 이하(n=20). 2-4 cm(n=32). 4 cm이상(n=27)으로 나누었다 각 검사방법에서 주위 정상 간조직의 조영정도와 비교하여 조영정도가 더 높은 부분을 가지고 있는 경우 혈관성이 있다고 평가하였고. 비슷하거나 더 낮은 부분만을 가지고 있는 경우는 혈관성이 없는 것으로 평가 하였다 혈관성을 검출할 수 있는 간세포암을 대상으로 각 검사방법들의 혈관성 검출능을 비교 평가하였으며 . 간세포암의 크기에 따른 각 검사방법들의 혈관성 검출능의 타이를 평가하였다 결과: 전테 간세포암의 혈관성 검출능은 역동적 간동맥조영 CT가90.9%(40/44)로 가장 우수 하였고, 간동맥조영 CT가 88.0%(66/75), 혈관조영술 80.3%(61/76). 삼중시기 나선 CT 72.4%(42/58)이었다. 2 cm 이하 군에서 삼중시기 나선 CT의 혈관성 검출능은 53.3% (8/15), 혈관조영술은 55.6%(10/18). 간동맥조영 CT는 76.5%(13/17), 역동적 간동맥조영 CT는 85.7%(6/7)이었고. 2-4 cm군에서는 삼중시기 나선 CT 71 4%(15/21). 혈관조영술 78.1%(25/32) 간동맥조영 CT 84.4%(27/32), 역동적 간동맥조영 CT는 86.4%(19/22)이 었으며 .4 cm이상 군에서는 삼중시기 나선 7786.4% (19/22) , 혈관조영술 100% (26/26) , 간동맥조영 CT 100% (26/26) . 역동적 간동맥조영 CT 100% (15/15)이었다 결론: 전체적인 혈관성 검출능과 4 cm이하의 크기를 갖는 간세포암의 혈관성 검출능은 역동적 간동맥조영 CT, 간동맥조영 CT. 혈관조영술. 삼중시기나선 CT의 순이었지만. 4 cm 이상의 크기가 큰 간세포암의 혈관성 검출능은 삼중시기 나선 CT와만 타이를 보이고, 혈관조영술, 간동맥조영 CT. 역동적 간동맥조영 CT간에 타이가 없었다 혈관조영술은 간세포암의 크기변화 에 따라 가장 큰 검출율의 타이를 보였다 Purpose: To compare the detectability of tumor vascularity using triphasic spiral CT, angiography, CT during hepatic arteriography(CTHA) and single-level dynamic CTHA(SLD-CTHA). Materials and Methods: Seventy-nine pathologically confirmed nodular hepatocellular carcinomas(HCCs) in 77 patients were included in this study. Sixty patients were male and 17 were female, and their ages ranged from 31 to 77 (average,57.4) years. HCCs were classified into three groups according to the size: less than 2 cm (n=20),2-4 cm (n= 32), and more than 4 cm (n =27) in diameter. If a portion of tumor demonstrated greater enhancement than surrounding liver parenchyma, vascularity was deemed to be present. Detectability by each imaging technique was compared according to size and overall. Results: Hypervascularity was frequently detected by SLD-CTHA (90.7% (40/44)], followed by CTHA (88.0%(66/75)], angiography (80.3%(61/76)], triphasic spiral CT [72.4%(42/58)]. In the less than 2 cm group, detectability rates for triphasic spiral CT, angiography, CTHA and SLD-CTHA were 53.3%(8/15) , 55.6%(10/18) , 76.5%(13/17) and 87.5%(6/7), respectively. while the 2-4 cm group demonstrated corresponding figures of 71.4%(15/21),78.1%(25/32), 84.4%(27/32) and 86.4%(19/22). In the more than 4 cm group, the rate for triphasic spiral CT was 86.4%(19/22), while for angiography, CTHA and dynamic CTHA, it was 100%. Conclusion: In the detection of hypervascularity of HCC, SLD-CTHA showed the highest rate, followed by CTHA, angiography, and triphasic spiral CT In HCCs less than 4 cm in diameter, the corresponding ordering was SLD-CTHA, CTHA, angiography and triphasic spiral CT, but in HCCs of more than 4 cm, angiography, CTHA and SLD-CTHA detected hypervascularity equally well. Lesion size most affected the findings of angiography.

무기폐를 일으키는 기관지결핵과 기관지폐암의 감별진단에 대한 연구:CT 소견을 중심으로

정환훈 대한영상의학회 1995 대한영상의학회지 Vol.33 No.4

Purpose ; Endobronchial tuberculosis and bronchogenic cancer are common causes of atelectasis or obstructivepneumonitis in Korea. Differntiation between endobronchial tuberculosis and bronchogenic carcinoma is importantfor the treatment and prognosis but it is sometimes difficult to differentiate these two lesions with radiologicexaminations. The purpose of this study was to find the differential points between endobronchial tuberculosis andbronchogenic carcinoma associated with atelectasis or obstructive pneumonitis. Materials and Methods ; Fortypatients in whom atelectasis or obstructive pneumonitis was detected on chest radiographs comprised the study. Adefinite mass opacity was not observed on chest radiographs in all patients. In these patients, the causes ofobstruction were endobronchial tuberculosis (n=20) and bronchogenic cancer (n=20) which were microbiologically orpathologically confirmed. Results ; Double obstructive lesions were more frequently found in endobronchialtuberculosis (8/20) than in bronchogenic cancer (1/20). Multiple calcifications along the bronchial wall andsevere distortion of bronchi were observed only in endobronchial tuberculosis (4/20) and associated low densitymass at obstruction site was only observed in bronchogenic cancer (6/20). Bronchial dilatation (11/20) andparenchymal calcifications (14/20) distal to obstruction site, air containing bronchogram at post obstructivebronchus (14/20) were more frequently found in endobronchial tuberculosis. Contour bulging at obstruction site(14/20), and only mucus bronchogram at post obstructive bronchus (14/20) are more frequently found in bronchogeniccarcinoma. Conculusion : In patients with atelectasis or obstructive pneumonitis, endobronchial tuberculosis ischaracterized by double obstructive lesion, multiple calcifications at the bronchial wall, and severe distortionof the bronchi. Endobronchial carcinoma is characterized by a low density mass at the obstructive site.

저혈관성 간세포암의 방사선학적 소견

정환훈 ( Hwan Hoon Chung ),김윤환 ( Yun Hwan Kim ) 대한간암학회 2001 대한간암학회지 Vol.1 No.-

저혈관성 증례 저혈관성을 보인 간세포암

정환훈 ( Hwan Hoon Chung ),김윤환 ( Yun Hwan Kim ),김영선 ( Young Sun Kim ),엄순호 ( Soon Ho Um ),원남희 ( Nam Hee Won ) 대한간암학회 2001 대한간암학회지 Vol.1 No.-

Venogram of the Upper Extremity Using the Tourniquet Technique for the Evaluation of Central Vein Patency: A Comparison to Conventional and CO_2 Venogram

이선아,정환훈,이승화,차상훈,제보경,서보경,김백현,서형석 대한영상의학회 2011 대한영상의학회지 Vol.65 No.1

Purpose: To compare the tourniquet technique (TT) with the conventional venogram (CV) and the carbon dioxide venogram (CO2V) for the evaluation of central vein patency of the upper extremity. Materials and Methods: CO_2V, TT, and CV were performed on 100 upper extremities prior to an arteriovenous fistula operation. The central vein was divided into four segments. The best image of the venograms for each segment was chosen as a reference, and the venogram techniques for each segment were graded from 1 (invisible) to 5 (excellent) compared with those of the reference image. The grades of the various venogram techniques at each segment of the vein were compared statistically. Results: For the SVC segment, the mean grades of CO_2V, TT, and CV were 4.32, 3.60, and 2.45, respectively. TT is statistically superior to CV but inferior to CO_2V. On the brachiocephalic vein, the mean grades of CO_2V, TT, and CV were 4.41, 4.37, and 2.77 and were 4.81, 4.85, and 3.78 for the subclavian vein and 4.75, 4.93, and 4.57, respectively, on the axillary vein. On these segments, TT was statistically superior to CV, but no difference was noted with CO_2V. Conclusion: TT is superior to CV in every segment of the central vein and presents similar values to those of the CO_2V, except for the SVC.

Target Balloon-Assisted Antegrade and Retrograde Approach for Recanalization of Thrombosed Fem-Pop Bypass Graft Using the Outback Catheter

곽정원,정환훈,이승화,염석규,차상훈 대한영상의학회 2016 대한영상의학회지 Vol.74 No.1

The subintimal arterial flossing with antegrade-retrograde intervention (SAFARI) technique is reportedly effective in severe peripheral vascular disease that cannot be treated with standard endovascular techniques including subintimal angioplasty. In this report, we used a target balloon with the Outback catheter to recanalize a thrombosed bypass graft that could not be treated successfully with SAFARI.