Dual Source CT에서 연속 Flash Mode를 이용한 관상동맥 검사의 유용성

한현수(Hyeon Soo Han),김병훈(Byeong Hoon Kim),김일석(Il Seok Kim),방동호(Dong Ho Bang),박성훈(Seong Hoon Park) 대한CT영상기술학회 2011 대한CT영상기술학회지 Vol.13 No.1

목 적 본 연구의 목적은 전향적 심전도 동기화를 이용한 연속적인 CT 관상동맥검사의 유용성을 평가하기 위해서이다. 대상 및 방법 2010년 6월부터 7월까지 17명의 환자(남자 15명, 평균연령 56.5세)를 대상으로 하였다. 모든 환자는 128 slice dual source CT를 이용하여 연속적인 전향적 심전도 동기화 관상동맥검사를 시행하였다. 한번의 조영제를 bolus로 주입한 후, 첫 번째 scan은 RR interval의 60%되는 시점에서, 두 번째 scan은 RR interval의 55% 되는 시점에서 scan을 시작하였다. 모든 data는 영상의 질을 평가하기 위해서 3D workstation으로 전송되었다. 각각의 scan의 유효선량을 측정하였다. 두 명의 영상의학과 의사와 두명의 방사선사가 합의하에 관상동맥의 영상의 질을 acceptable 혹은 unacceptable한지 평가하였다. CT scan 당시의 심전도와 심박동수를 측정하였고, dynamic enhancement curve를 기록하였다. 정량적인 평가를 위해서 각각의 관상동맥과 대동맥의 attenuation을 측정하여 통계적으로 비교하였다. 결 과 연속적인 전향적 심전도 동기화 CT 관상동맥 검사의 평균적인 유효선량은 2.97 mSv로 전향적 CT 관상동맥 검사만 시행했을 때 1.31 mSv보다 높았다. 총 51개의 관상동맥이 본 연구에 포함되었다. 첫 번째 CT관상동맥 검사에서 47개(92.2%), 두 번째 CT관상동맥 검사에서 48개(94.1%)의 관상동맥의 영상의 질이 accetable하였다. 동시에 unacceptable한 관상동맥은 없었다. Unacceptable한 경우에서 심전도가 부적절한 경우가 있었다. 하지만 모든 부적절한 심전도 중에 scan된 관상동맥의 영상의 질이 unacceptable하지 않았다. 대동맥의 attenuation의 통계적인 차이는 없었다. 결 론 연속적인 전향적 심전도 동기화 CT 관상동맥 검사는 약간의 유효선량의 증가가 있지만 unacceptable한 CT 관상동맥검사의 확률을 낮추었다. Ⅰ. Purpose To evaluate the usefulness of double CT coronary angiography(CTCA) with prospective ECG gating using dual source CT by analyzing the dose effect and image quality. Ⅱ. Materials and Methods Between June and July 2010, 17 patients(15 men, mean age, 56.5 years) underwent 128-slice CTCA using prospective ECG gating with 2 different trigger delays (60% of the RR interval in the first CTCA and 55% of the RR interval in the second CTCA) and 2 different scanning directions (first CTCA in the craniocaudal direction and second CTCA in the caudocranial direction) and a single bolus injection of contrast agent. The first and second CTCA images were acquired and then transferred to a 3D workstation to analyze image quality. Individual radiation-dose exposure was estimated from the dose-length product (DLP). Two radiologists co-assessed the overall image quality of each coronary artery in the first and second CTCA by using 2-point scale (acceptable or unacceptable). The ECG and heart rate during the CTCA and the dynamic enhancement curve for the bolus-injection technique were evaluated. For quantitative analysis, attenuation of each coronary artery and aorta of each scanned image were measured. Paired-t-tests were used for comparison of the measured attenuation data and overall image-quality data between the first CTCA and second CTCA images. Ⅲ. Results The mean effective radiation dose of double CTCA was 2.97 mSv (2.02-5.12 mSv), which was higher than 1.31 mSv of single CTCA. A total of 51 coronary arteries were analyzed. Of these, 47(92.2%) were acceptable in the first CTCA and 48(94.1%) were acceptable in the second CTCA. None of the coronary artery was unacceptable in both the first and second CTCA. Inappropriate ECG wave was detected in the unacceptable cases. However, all CTCA during inappropriate ECG did not cause unacceptable results. There was no statistical difference in aorta attenuation between the first CTCA and second CTCA. Ⅳ. Conclusion Double CTCA with prospective ECG gating could reduce the rate of unacceptable CTCA case with minimal additional radiation exposure.

3D 프린팅을 위한 수리미 제조 시 다당류 알긴산 첨가에 따른 물성 변화

김한호 ( Han-ho Kim ),최예희 ( Ye-hui Choi ),박예린 ( Ye-lin Park ),박정철 ( Jeong-cheol Park ),한현수 ( Hyeon-su Han ),강유석 ( Yoo-seok Kang ),김수형 ( Soo-hyeong Kim ),서훈서 ( Hun-seo Seo ),강우신 ( Woo-sin Kang ),김수룡 ( Su- 한국수산과학회(구 한국수산학회) 2021 한국수산과학회지 Vol.54 No.2

When manufacturing Alaska pollack Gadus chalcogrammus surimi for 3D printing, it examined the characteristics of physical properties and sensuality by adding polysaccharides alginic acid [0, 1, 2, 3% (w/w)]. As a result of the color value of surimi by adding alginic acid, it showed that the lightness of heated surimi containing 2% (w/w) alginic acid was the highest and ΔE value was the lowest. In the changes in physical properties, the heated surimi of 3% (w/w) alginic acid content showed the lowest values of hardness, springiness, cohesiveness, gumminess, chewiness and resilience, but the highest adhesiveness. In the case of fried surimi, its hardness, cohesiveness, gumminess, chewiness and resilience were the lowest at the content of 3% (w/w) alginic acid. After 7 days of cold storage, the hardness, gumminess, and chewiness of heated surimi with an alginic acid content of 2% (w/w) were significantly higher, and fried surimi was also the same. In the results of the sensory evaluation, there were significant differences according to the alginic acid content in hardness and fishy smell, and as the alginic acid content increased, it felt more fishy smell, resulting in poor preference.

혈전용해술 후 뇌출혈 유무확인을 위한 Dual Energy Computed Tomography의 유용성

윤병운(Byeong Un Yoon),김병훈(Byeong Hoon Kim),한현수(Hyeon Soo Han),김종학(Jong Hak Kim),이동근(Dong Keun Lee) 대한CT영상기술학회 2012 대한CT영상기술학회지 Vol.14 No.1

목적 급성 허혈성 뇌졸중으로 내원하여 유로키나제를 이용한 국소적 동맥 내 혈전용해술을 시행한 후 뇌출혈의 유무를 알아보기 위하여 Dual Energy(DE)를 이용한 전산화단층촬영술(computed tomography; CT)의 유용성을 알아보고자 하였다. 대상 및 방법 2010년 6월부터 2011년 5월까지 본원에 내원하여 급성 허혈성 뇌졸중으로 진단받고, 유로키나제를 이용하여 국소적 동맥 내 혈전용해술을 시행한 후 뇌출혈의 유무를 알아보기 위하여 Dual Energy(DE)를 이용한 전산화단층촬영술(computed tomograpyh; CT)을 실시한 환자를 대상으로 하였다. 대상환자는 총 52명이었으며, 이중 남자는 29명, 여자는 23명이었고, 연령분포는 30대~80대(평균 66.5세)까지였다. 결과 대상환자 52명 중 성별로는 남자 29명(55.8%), 여자 23명(44.2%)으로 조사되었고, 연령별로는 70대가 18명(34.6%)으로 가장 많았으며, 60대 및 50대가 각각 15명(28.8%)과 9명(17.4%)으로 그 다음 순이었다. 대상환자 52명 중 뇌출혈이 발생된 경우 13명(25.0%)이였으며, 70대가 6명(46.2%)이고 60대가 3명(23.0%)순이었다. 13명 중 부위별 분포는 Basal ganglia 8명(61.5%), Middle Cerebral Artery 5명(38.5%)순으로 나타났다. 결론 혈전용해술을 시행한 후 Dual Energy를 이용한 전산화단층촬영술은 뇌출혈의 유무를 확인하는데 있어서 유용한 검사방법이라고 사료된다. I. Purpose Purpose of this article is to assess feasibility of dual energy computed tomography(DECT) in detecting hemorrhage of patients with acute ischemic strake, after intra-arterial thrombolysis using urokinase. II. Materials and Methods 52 patients, 29 were male and 23 were female, with age ranging from 30s to 80s, mean 66.5, who were diagnosed as acute ischemic stroke and received localized intra-arterial thrombolysis using urokinase, were assigned to this study, CT images were taken with dual energy CT to detect hemorrhage of the patients after the thrombolysis was done. III. Results Among 52 patients, 29(55.8%) were male and 23(44.2%) were female. The largest number of patients were in their 8th decade(n=18, 34.6%), followed by 7th decade(n=15, 28.8%), 5th decade(n=9, 17.4%). Hemorrhage was detected in 13 patients(25.0%), 6 were in their 70s(46.2%) and 3were in their 60s(23.0%). Basal ganglia was the most commonly affected area(n=8, 61.5%), followed by Middle Cerebral Artery (n=5, 38.5%) IV. Conclusion Dual energy CT is considered to be useful in detecting hemorrhage in patients who received thrombolysis.

라이다 기반의 포인트 클라우드를 이용한 ADOP 성능 개선

김혜지(Hye-Ji Kim),안지수(Ji-Su An),이정언(Jeong-Eon Lee),최소미(So-Mi Choi),한현수(Hyeon-Soo Han),황성수(Sung-Soo Hwang) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

Replicating real-world spaces in virtual environments is becoming increasingly important. However, the current methods for constructing virtual spaces have the drawback of increased costs and time as the quality of the space improves. This paper addresses this issue by introducing ADOP, a neural rendering technique that utilizes point cloud as an additional input data. The paper also proposes a technique to generate more compact and precise point clouds by fusing LiDAR and stereo cameras, including color and normal vector information. The resulting point cloud is then used as input for ADOP to enhance its rendering performance. Experiments have confirmed that using point clouds obtained with LiDAR results in improved rendering performance in featureless indoor spaces.

Globus Hystericus 130례에 대한 임상적 고찰

한현수,이호준,황혜헌,장철호 대한가정의학회 1990 Korean Journal of Family Medicine Vol.11 No.5

농촌 지역 병원 응급실에 내원한 소아 급성 중독의 임상적 고찰

한현수,황혜헌,이창희,조명호,최규동 대한가정의학회 1991 Korean Journal of Family Medicine Vol.12 No.2