요관폐색에서 도플러초음파검사에 관한 실험적 연구 : 폐색정도 및 폐색부위에 따른 변화 Changes According to the Degree and Site of Obstruction

한태일,송문갑 凡石學術奬學財團 1999 凡石學術論文集 Vol.3 No.-

당뇨병성 족혈관 질환의 도플러 초음파 : 족혈관의 정량적 혈류량 분석 Quantitative Analysis of Blood Flow Volume

서영란,김호철,최철순,윤대영,한대희,문증희,배상훈 대한초음파의학회 2002 ULTRASONOGRAPHY Vol.21 No.3

The effects of gingival blood flow on pulpal blood flow detection using ultrasound Doppler flowmetry: animal study

Kim Dohyun,Ko Hyoung-Seok,Park Soo-Yeon,Ryu Seung-Yeon,Park Sung-ho 대한치과보존학회 2023 Restorative Dentistry & Endodontics Vol.48 No.1

Objectives This study evaluated the effect of adjacent gingival blood flow on detection of pulpal blood flow (PBF) using ultrasound Doppler flowmetry (UDF) through animal study. Materials and Methods The study included 36 right and left maxillary the third incisors and canines in 9 experimental dogs. The study included 2 main steps: In the first step, the pulse sound level (PSL) was recorded on the cervical part of each tooth without flap elevation (Group 1), with flap elevation (Group 2), and after it was repositioned in place (Group 3). In the second step, the PSL was recorded on the cervical part of each tooth (Group 4), after pulpotomy (Group 5), after partial pulp extirpation (Group 6), after complete extirpation (Group 7), and after canal filling (Group 8). In Groups 5–8, the study was performed with and without flap elevation in the left and right teeth, respectively. The PSL was graded as follows: 0, inaudible; 1, heard faintly; and 2, heard well. The difference between each group was analyzed using Friedman’s test with Wilcoxon signed-rank tests (α = 0.05). Results In step 1, the PSL results were Group 1 > 2 and 3. In step 2, there was no significant difference between the groups when the flap was not elevated, while PSL results were Group 4 > 5 ≥ 6 and 7 ≥ 8 when the flap was elevated. Conclusions PBF is affected by gingival blood flow when measured with UDF. UDF measurements require isolation of gingiva from the tooth.

만성 간질환에서 Color Doppler를 이용한 신실질내 혈류동태에 관한 연구

이문성,김홍수,김진홍,조성원,심찬섭 대한초음파의학회 1991 ULTRASONOGRAPHY Vol.10 No.1

A Parametric Study of the Functioning of an Axisymmetric Explosive Separation Device

Guangyu Wang,Quan Wen,Xiaopeng Wang,Yushi Wang 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.6

At present, the design and optimization of the linear explosive separation device mainly depends on experiment, which is not only costly but also low efficient. The introduction of finite element analysis prior to experiment may reduce the cost to design a linear explosive separation device. Herein, arbitrary Lagrangian–Eulerian (ALE) numerical method is utilized to investigate the functioning of an axisymmetric explosive separation device. Firstly, several ALE models are validated via explosive separation experiments and photonic Doppler velocimetry (PDV) measurements, and found to have reasonable accuracy. Then, a series of ALE models are developed to study the transient separation process of an axisymmetric explosive separation device. Multiple factors which may influence the process are identified through parametric study. Especially, it is found that the linear density of the explosive core in the detonating cord and the bottom radius of the v-notch on the separation plate are critical for the accumulation of effective plastic strain at the v-notch. In addition, the material of the protection plate and the angle of the v-notch have a certain influence on the effective plastic strain at the v-notch. The material strength of the protection plate almost has little influence on the effective plastic strain at the v-notch. The study may facilitate the optimal design of the axisymmetric explosive separation device.

급성 충수염의 진단에 있어서 회색도 초음파, 색 도플러 초음파와 출력 도플러 초음파 검사의 비교 : Comparison between Gray scale, Color Doppler and Power Doppler US

강성학,신성란,이호경,육동준,노택수,이민진,이상천 대한초음파의학회 1998 ULTRASONOGRAPHY Vol.17 No.2

두꺼워진 담낭벽의 칼라도플러 초음파 소견

한상석 대한영상의학회 1996 대한영상의학회지 Vol.35 No.5

Purpose : The thickening of the gallbladder wall is a valuable finding for the diagnosis of cholecystitis, butmay be seen in non-cholecystic disease as well as in acute or chronic cholecystitis. The purpose of this study isto determine the value of color Doppler sonography in differentiating the causes of thickened gallbladder wall.Materials and Methods : Ninety eight patients with thickened gallbladder wall(more than 3mm) which was not due togallbladder cancer were prospectively evaluated with color Doppler sonography. Sixty-six cases, confirmed bypathologic reports and clinical records, were analyzed for correlation between thickened gallbladder wall andcolor flow signal according to the underlying causes. Results : Of the 66 patients, 28 cases were cholecystitisand 38 cases had non-cholecystic causes such as liver cirrhosis, ascites, hepatitis, pancreatitis, renal failure, and hypoalbuminemia. Of the 28 patients with cholecystitis(12 acute, 16 chronic), 23(82%) had color Doppler flowsignals in the thickened gallbladder wall. Of the 38 patients with non-cholecystic causes, eight(21%) had colorDoppler flow signals. There was a statistically significant difference of color Doppler flow signals between thecholecystitis and non-cholecystic groups(p=0.0001). No significant difference of color Doppler flow signals wasfound between cases of acute and chronic cholecystitis. Of the 23 patients with color Doppler flow signals in 28cases of cholecystitis, 18(78.3%) showed a linear pattern and five(21.7%) showed a spotty pattern. Of the eightpatients with color Doppler flow signals in the 38 non-cholecystic cases, four(50%) showed a linear pattern andfour(50%) showed a spotty pattern. In cholecystitis, a linear color Doppler flow signal pattern is a much morefrequent finding than a spotty pattern. Conclusion : Color Doppler sonography is a useful and adequate method fordetermining whether a thickened gallbladder wall is the result of cholecystitis or has non-cholecystic causes.

출력 도플러 초음파를 이용한 간종양의 혈관분포

윤성국,최종철,이하종,이진화,나경진,박병호,구봉식 대한초음파의학회 1998 ULTRASONOGRAPHY Vol.17 No.2

실험적으로 유발한 가토 VX2 암종의 종양 혈관: 조영 증강 출력 도플러 초음파 및 혈관 조영술 소견과 병리조직학적 소견과의 비교

김영훈,한준구,정진욱,이경호,김석준,최병인,장기현,Kim, Yeong-Hun,Han, Jun-Gu,Jeong, Jin-Uk,Lee, Gyeong-Ho,Kim, Seok-Jun,Choe, Byeong-In,Jang, Gi-Hyeon 대한영상의학회 2002 대한영상의학회지 Vol.46 No.5

목적: 실험적으로 가토의 대퇴부에 유발한 VX2 암종의 종양 혈관상을 조영 증강 출력 도플러초음파 및 디지털 감산 혈관 조영술의 조영 증강 양상으로 평가하고 양자의 소견을 비교하며 조영 증강 양상의 차이를 유발하는 병리 조직학적 근거를 규명하는데 있다. 대상과 방법: 가토의 대퇴부에 이식된 30개의 VX2 암종에 대해 조영 전 출력 도플러 초음파 영상을 얻고 미세기포 초음파 조영제를 정주 하여 조영 증강 출력 도플러 초음파 영상을 얻은 후 디지털 감산 혈관 조영술을 시행하였다. 이후 조직 절편을 얻어 영상 소견과 병리 조직학적 소견을 연관 분석하였다. 조영 전 및 조영 증강 출력 도플러 초음파와 혈관 조영술 영상에서 종양 혈관의 분포 양상을 분석하고 종양내 혈관 밀집도 점수 및 종양의 전체 면적에 대한 혈관 면적의 백분율을 구하였다. 병리조직학적 검사를 통해 괴사정도, 섬유혈관성 간질 및 피막의 발달 정도를 분석한 뒤 이를 영상 소견과 연관시켜 보았다. 결과: VX2 암종의 종양 혈관상은 조영 증강 출력 도플러 초음파검사에서 무혈관성이 9예, 주 변부 분포형이 15예, 미만성 분포형이 6예였다. 혈관 조영술에서는 8예가 무혈관성, 14예가 주변부 혈관 분포, 그리고 나머지 8예는 미만성 혈관 분포를 보였다. 혈관 분포의 양상은 두 검사간에 통계적으로 유의한 상관관계를 보였다. 혈관 밀집도 점수와 혈관 면적 백분율은 조영증강 출력 도플러와 혈관 조영술 사이에서 유의한 상관관계를 보였다.병리 조직학적 검사에서 미만성 혈관분포를 보였던 예들은 종양의 경계가 분명하고 피막과 섬유혈관성 간질이 잘 발달되어 있었다. 괴사정도, 피막 및 섬유성 간질의 발달 정도는 출력 도플러 초음파 및 혈관 조영술의 혈관밀집도 점수, 혈관 면적 백분율과 유의한 상관관계를 보였다. 결론: 가토의 대퇴부에 유발한 VX2 암종은 조영 증강 출력 도플러 초음파와 혈관 조영술에서 무혈관성에서부터 과혈관성에 이르기까지 다양한 종양 혈관상을 보였고 이러한 종양 혈관의 양상은 괴사정도, 섬유성 간질 및 피막의 발달 정도 같은 병리 조직학적 지표들과 유의한 상관관계를 보였다. Purpose: To describe findings of enhanced power Doppler sonography and DSA in experimentally induced VX2 carcinomas in rabbit thigh and to correlate the imaging findings with the histopathologic features. Materials and Methods: A total of 30 VX2 carcinomas were implanted in rabbit thigh, and after conventional and enhanced power Doppler sonography and DSA, histopathologic examination was performed. Enhanced power Doppler sonography and DSA, were used to determine the distribution pattern of tumor vascularity; to assess its grade and the percentage of a tumor area occupied by vessels, conventional and enhanced power Doppler sonography, as well as DSA, were used. The grade of necrosis and the development of fibrovascular stroma and capsule were histopathologically determined. The findings of power Doppler sonography were compared with those of DSA and the imaging features were correlated with the histopathologic features. Results: At enhanced power Doppler sonography, the signal was either avascular (n=9), peripheral (n=15) or diffuse (n=6), while at DSA, the corresponding totals were eight, fourteen and eight. There was statistically significant corelation between enhanced power Doppler sonography and DSA, both in their depiction of the distribution of patterns of tumor vascularity and as regards their findings of grade and percentage of vascular area. As determined by both conventional and enhanced power Doppler sonography, and by DSA, grade of necrosis and the development of fibrovascular stroma and a capsule correlated with grade and the percentage of vascular area. Conclusion: Experimentally induced VX2 carcinomas in rabbit thigh demonstrated various patterns of tumor vascularity, and the findings of enhanced power Doppler sonography correlated with those of DSA. Tumor vascularity, as demonstrated by two imaging modalities, correlated closely with grade of necrosis and the development of fibrovascular stroma and a capsule, as revealed by histopathologic examination.

유방 고형종괴에 대한 출력 도플러와 색 도플러 초음파의 비교

진승범,국신호,이영래,박해원,박윤옥,김종욱,이영욱,배원길,박용래 대한영상의학회 1998 대한영상의학회지 Vol.39 No.5

Purpose : To compare power and conventional color Doppler sonography for depiction of the vasculature of solid breast lesions, and to evaluate the usefulness of power Doppler sonography for differential diagnosis of malignant breast lesions. Materials and Methods : In order to detect vascularity, 82 cases of solid breast lesions were evaluated by power and color Doppler sonography. Fifty-eight pathologically proven cases (37 benign and 21malignant lesions) were analyzed for the amount and patterns of Doppler signals, morphology of vessels, and the diagnostic accuracy. Results : In 45 of 82 cases, power Doppler sonography depicted flow better than did color Doppler sonography, while in 37 cases, depiction was equal. On power Doppler sonography, the incidence of marked blood flow in malignant lesions was three times higher than in benign lesions. The pattern of vasculature was more predominantly central (85.5 %) and penetrating (61.9 %) in malignant lesions than in benign lesions. Branching (57.1 %) and disordered vessels (33.3 %) were more frequent in malignant lesions than in benign. For the diagnosis of malignancy, sensitivity for power Doppler sonography was 65 %, specificity was 79 % and diagnostic accuracy was74.1 %; for color Doppler sonography, the corresponding figures were 76.9 %, 75.6 % and 75.9 %.Conclusion : Power Doppler sonography was more sensitive than color Doppler sonography for the detection of flow in solid breast lesions. For the differentiation of benign from malignant lesions, however, there was no difference in diagnostic accuracy between the two modalities. findings of central and penetrating distribution patterns of Doppler signals, and branching and disordered shapes of vessels, along with other sonographic criteria, are helpful for predicting malignancy.