• 대한자기공명의과학회:학술대회논문집
• /
• 대한자기공명의과학회 2002년도 제7차 학술대회 초록집
• /
• pp.117-122
• /
• 2002

Contrast-enhanced MR angiography has become a widely used method useful for clinical diagnosis. Early studies identified a number of technical issues, and many of these have been addressed with various MRI physics innovations over the last several years. The quality of the results is high enough that CE MRA is replacing conventional x-ray angiography methods at many institutions. Ongoing research is expected to provide further improvements in performance, most notably in additional reductions in examination time, in time-resolved 3D imaging, and in improved imaging of the peripheral vasculature with extended fields of view.

• 대한디지털의료영상학회논문지
• /
• 제14권2호
• /
• pp.1-8
• /
• 2012

Purpose : We aim at presenting the optimum radiologic factor through the evaluation of dose variation and of image quality through the use of a grid in Humerus examination and the change of dose because of the change of radiologic factor. Materials and Methods : We divided it in 3 cases: when using a grid or not and when using IP(Image Plate) in a digital system. Also, as fixing kVp to 70kVp it changed mAs, and fixing mAs to 10 it changed kVp, we put up resolution chart and Burger rose phantom on the acrylic phantom of 7cm (the same level of Humerus) to evaluate the dose and image. We used Image J program to evaluate the quantitative resolution of the obtained image, and made the qualitative evaluation and statistical analysis of the image saved in PACS for 20 radiologic technologist with more than 10 years of experience in order of evaluate its contrast. We used SPSS10(SPSS Inc. Chicago, Illinois) for statistical analysis. Results : We observed the analytic result of resolution by the change of kVp that it was $4.539dGycm^2$ in 60kVp and $757.472dGycm^2$ in 75kVp, which increased about 64.6% of dose, while for the resolution it had the pixel value 30.7% better with 851 in 60kVp than 651 in 75kVp. Also, we analyzed the result of resolution by the change of mAs that it was $3.106dGycm^2$ in 5mAs, and $12.470dGycm^2$ in 20mAs, which increased about 400% of dose, while for the resolution DR had 678 in 5mAs, and 724 in 20mAs that increased about 6.8% of resolution. We made the qualitative evaluation of contrast by the change of kVp that DR showed the higher quality than CR, but the contrast by the change of kVp had no special different at the moment of visual evaluation, nor statistically significant difference(P>0.05). We observed the qualitative evaluation of contraste by the change of mAs that the contrast increased as DR increased mAs, and had statistically significant difference(P<0.05). On the other hand, CR had no significant difference for more than 10mAs nor statistically significant difference(P>0.05). Conclusion : In case of some patients with radiographic exposure by the repeated examination such as emergent patient or Follow up patient, they are considered to try to limit the use of a grid, to set kVp under 65kVp in fixed mode, to select less than 10mAs and to reduce the possibility of patient being bombed.

• 치과방사선
• /
• 제29권1호
• /
• pp.275-282
• /
• 1999

Purpose: The objective of this study was to compare clinical examination of dental caries and secondary caries with panoramic examination. and to examine bone lesions and dental anomaly of unerupted state. Materials and Methods: In this study. clinical records and panoramic radiographs were available for 89 first grade students in elementary school. Dental caries of occlusal surfaces. proximal surfaces. and buccolingual surfaces were examined. Secondary caries was examined too. In addition. the central lesion and dental anomaly of unerupted state were examined in panoramic radiographs. Results: The obtained results were as followed: 1. Carious detectability of clinical examination in occlusal and buccolingual surface was higher than that of panoramic examination. but it is statistically insignificant(p>0.05). In proximal surface. carious detect ability of panoramic examination was higher than that of clinical examination. and it is statistically significant(p<0.01). 2. In contrast to clinical examination only. when the two examination methods were combined. there was additional detection of dental caries(26.7％ in occlusal surface. 48.2％ in proximal surface. 33.3％ in buccolingual surface. and 38.3％ totally). 3. In detection of secondary caries. panoramic examination had lower ability than clinical examination in all three surfaces. but in case that both methods were combined. totally 36.0％ extra carious lesions were detected. 4. In panoramic examination. detectability of secondary caries in upper teeth is lower than lower teeth. 5. In panoramic examination. it was possible to detect the central lesions and dental anomalies of unerupted state which cannot be detected in clinical examination. Conclusion: It is useful to combine the panoramic examination with clinical examination in order to increase carious detectability and to evaluate the central lesions and dental anomalies of unerupted state

• 대한방사선협회지
• /
• 제25권1호
• /
• pp.23-23
• /
• 1999

We tested MC in barium suspension for the evaluation of the gastrointestinal tract on CT examination. A total of 30 subjects who underwent CT with use of 900 ml of MC in barium suspention ($1.5\%$ weight/volume) were included for the study. Ant

• 약학회지
• /
• 제53권6호
• /
• pp.328-333
• /
• 2009

Contrast media are substances that are used to enhance the contrast of structures or fluids within the body in medical imaging. Those are commonly used to enhance the visibility of blood vessels and the gastrointestinal tract. The aim of this study is to evaluate patients who got injected iopamidol, developed as one of contrast medium regarding changes in cardiovascular system and especially, adverse drug reactions. This study were performed on randomly selected a total of 51 patients (range of 15~85 years old) who got injected contrast medium, Iopamidol at a P hospital in Gyeonggi province from September 22nd, 2008 to January 24th, 2009. Data were collected by questionnaire though person to person. We analyzed the data by SPSS (Version 12. for windows). Methods of analysis were frequency and cross analysis. In results, 19.6% (n=10) were founded for adverse drug reactions of contrast medium. 25.0% (n=4) of 10 patients who had adverse drug reactions of contrast medium had took abdomen contrast test. 2 patients of those took contrast test for chest. Also, 3.9% (n=2) patients felt vomiting and nausea after injection of contrast medium. In conclusion, 19.6% patients experienced adverse drug reaction of contrast medium. Therefore, when taking radiation test, we should make efforts to minimize adverse drug reactions to achieve suitable and effective treatment.

• Asian Pacific Journal of Cancer Prevention
• /
• 제13권8호
• /
• pp.3709-3712
• /
• 2012

This study evaluated the advantages and applications of contrast-enhanced ultrasound (CEUS)-supported percutaneous radiofrequency ablation (RFA) in the treatment of metastatic hepatocellular carcinoma after liver transplantation, based on clinical details. CEUS-supported percutaneous RFA was adopted to treat 12 patients with hepatic metastatic carcinomas after liver transplantation. The diameters of the metastatic carcinomas varied from 1 cm to 5 cm, and the foci were discovered after 3 months to 12 months. Each focus was diagnosed and localised by CEUS for RFA once or twice. Curative effects were evaluated by CEUS or contrast-enhanced CT after the treatment. The re-examination results at 2 weeks post-treatment showed that the foci of 11 patients were ablated completely, whereas one patient with the largest focus required retreatment by RFA because of a partial residue. No local recurrence was found one month later in the re-examination. CEUS-supported percutaneous RFA in the treatment of hepatic metastatic carcinoma after liver transplantation has the advantages of accurate localisation, good efficacy, easy operation, and minimal invasion without any complications. Therefore, it can be recommended as the preferred therapy for hepatic metastatic carcinoma after liver transplantation.

• Korean Journal of Radiology
• /
• 제2권1호
• /
• pp.21-27
• /
• 2001

Objective: To identify and evaluate the lateral border zone by comparing the size and distribution of the abnormal signal area demonstrated by MR imaging with the infarct area revealed by pathological examination in a reperfused myocardial infarction cat model. Materials and Methods: In eight cats, the left anterior descending coronary artery was occluded for 90 minutes, and this was followed by 90 minutes of reperfusion. ECG-triggered breath-hold turbo spin-echo T2-weighted MR images were initially obtained along the short axis of the heart before the administration of contrast media. After the injection of Gadomer-17 and Gadophrin-2, contrast-enhanced T1-weighted MR images were obtained for three hours. The size of the abnormal signal area seen on each image was compared with that of the infarct area after TTC staining. To assess ultrastructural changes in the myocardium at the infarct area, lateral border zone and normal myocardium, electron microscopic examination was performed. Results: The high signal area seen on T2-weighted images and the enhanced area seen on Gadomer-17-enhanced T1WI were larger than the enhanced area on Gadophrin-2-enhanced T1WI and the infarct area revealed by TTC staining; the difference was expressed as a percentage of the size of the total left ventricle mass (T2= 39.2 %; Gadomer-17 =37.25 % vs Gadophrin-2 = 29.6 %; TTC staining = 28.2 %; p < 0.05). The ultrastructural changes seen at the lateral border zone were compatible with reversible myocardial damage. Conclusion: In a reperfused myocardial infarction cat model, the presence and size of the lateral border zone can be determined by means of Gadomer-17- and Gadophrin-2-enhanced MR imaging.

• 한국방사선학회논문지
• /
• 제17권4호
• /
• pp.589-595
• /
• 2023

관상동맥 경련 유발로 혈관 완전 폐색이 발생할 경우 악성 부정맥 출현으로 사망까지 이를 수 있으므로 관상동맥 경축 협심증 조기 검사는 반드시 필요한 검사이다. 검사 방법 중 관상동맥 조영술을 통한 약물 주입 검사가 일반적으로 시행되고 있다. 따라서 관상동맥 조영 검사 중 경축 협심증 검사의 시술 시간과 조영제 사용량, 방사선 피폭 영향과의 연관성 등을 방사선학적 관점으로 이형성 협심증 조영 검사의 이점을 평가하고자 한다. 2021년 09월부터 2023년 02월까지 관상동맥 조영술과 변이형 협심증 검사를 시행한 142명 환자의 후행적 데이터를 이용하였다. 관상동맥 조영술과 변이형 협심증 검사 비교 분석 결과 체질량 지수를 제외하고 조영제 사용량 67.47 ± 21.81 cc, 흡수선량 15.98 ± 13.8 uGy/m², 공기 중 입사선량 236.73 ± 135.91 mGy, 촬영 시리즈 수 13 장, 검사 시간 1573.6 ± 428.77 s로 관상동맥 조영술만 시행했을 때의 조영제 사용량 49.1 ± 7.73 cc, 흡수선량 9.93 ± 7.81 uGy/m², 공기 중 입사선량 140.6 ± 79.76 mGy, 촬영 시리즈 수 6 장, 검사 시간 544.48 ± 185.76 s보다 통계적으로 유의할 만큼 높은 차이를 나타냈다. (p<0.001) 결론적으로 관상동맥 조영술 외 추가적인 변이형 협심증 검사가 방사선학적 관점에서 더 부정적일 수 있어 과도한 변이형 협심증 검사는 지양하는 것이 좋을 것으로 생각된다. 결론적으로 관상동맥 조영술 외 추가적인 변이형 협심증 검사가 방사선학적 관점에서 더 부정적일 수 있어 과도한 변이형 협심증 검사는 지양하는 것이 좋을 것으로 생각된다. 그럼에도 불구하고 변이형 협심증 검사를 진행해야 할 경우 검사 시간이 길어 질수록 투시 시간과 조영제 사용량도 증가하게 되므로 가능한 빠른 검사 또는 단축 검사를 진행해야 환자의 방사선학적 관점의 부정적인 측면도 해소할 수 있을 것으로 사료된다.

• 한국콘텐츠학회논문지
• /
• 제6권5호
• /
• pp.145-152
• /
• 2006

전산화단층촬영에서 자동주입기에 의한 방사선 조영제의 혈관외유출(140mL)이 우측 손등의 IV 카테터 부위에서 발생하였다. 혈관외유출은 부종 및 괴사를 동반하였고, 구획증후군으로 발전하였다. 혈관외유출 부위를 MDCT로 스캔하여, 3D 재구성 영상인 MPR, MIP, volume rendering으로 재구성하였다. 이러한 3D 재구성 영상은 조영제의 혈관외유출 부위를 침범 정도를 정확하게 확인하여 환자 예방의 필요성 및 사후 조치에 적절한 치료 및 수술 계획에 유용하게 이용될 수 있다.

• 한국임상수의학회지
• /
• 제11권1호
• /
• pp.359-368
• /
• 1994

This study was undertaken to evaluate image quality and level of discomfort during examination with various contrast media(meglumine ioxitalamate: Telebrix $30^{\circledR}$ , diatrizoate sodium: Hypaque $50^{\circledR}$, sodium ioxaglate ＋ meglumine ioxaglate: Hexabrix , iopamidol: Iopamiro $300^{\circledR}$ , iodized poppyseed oil: $Lipiodol^{\circledR}$ and barium sulfate: Baritop$^{\circledR}$and various radiographic contrast techniques(eye dropping: group 1, single injection to the superior punctum: group 2 and continuous injection to the superior punctum: group 3) on dacryocystorhinography in dogs. The results were as follows; 1. The Image quality of radiographic contrast technique of continuous Injection of contrast media(group 3) was better than the other techniques. 2. Average scores for dacryocystorhinography quality of sodium ioxaglate ＋ meglumine ioxaglate, iopamidol, barium sulfate, iodized Poppyseed oil, meglumine ioxitalamate and diatrizoats sodium were 3.67${\pm}$0.47, 3.67${\pm}$0.47, 3.50${\pm}$0.50, 3.33${\pm}$0.75, 2.50${\pm}$0.50 and 2.50${\pm}$0.76, respectively in group 3. 3. Diatrizoate sodium produced more discomfort than the other media. It was considered that the best radiographic contrast technique of dacryocystorhinography was continuous injection of contrast media to the superior punctum and sodium ioxaglate + meglumine ioxaglate, iopamidol, iodized Poppyseed oil and barium sulfate were the excellent contrast media for dacryocystorhinography in dogs.