합병증 없는 산모에서 태반의 3D 파워도플러초음파를 이용한 종단연구

정난희 ( Nan Hee Jeong ),양기열 ( Ki Yeol Yang ),설현주 ( Hyun Joo Seol ),정의 ( Eui Jung ) 대한산부인과학회 2012 Obstetrics & Gynecology Science Vol.55 No.7

목적: 임신 1, 2삼분기에 시행한 태반의 3D 파워도플러초음파와 출생체중의 관계를 알아보기 위하여 시행하였다. 연구방법: 54명의 합병증 없는 비흡연 산모를 대상으로 임신 10-13주, 19-22주에 3D 파워도플러초음파를 시행한 종단연구이다. 태반의 부피 (placental volume, PV)와 혈관지수를 임상 및 초음파 양상과 상관 및 회귀분석을 시행하였다. 결과: 모든 혈관지수는 임신 2삼분기가 1삼분기보다 의미 있게 컸다. 출생체중이 증가할수록 태반의 혈관지수도 증가하는 경향을 보였고, 이중임신 1삼분기의 flow index (FI)만이 통계적 의미가 있었다(P = 0.02). 임신 1, 2삼분기의 PV은 임신 2삼분기의 FI와 음의 상관관계를 보였다. 결론: 본 연구결과는 임신 1삼분기 태반의 FI가 태반의 혈관화 정도를 반영함으로써 태아와 태반의 성장에 의미 있게 영향을 미침을 시사한다. Objective: The purpose of our study was to investigate the relationship between birth weight and 3-dimensional (3D) power Doppler histogram of the placenta in the first- and second-trimester of uncomplicated pregnancies. Methods: In this longitudinal study, 3D power Doppler ultrasound was performed in 54 non-smoking women with uncomplicated pregnancies at 10 to 13 weeks of gestation and subsequently at 19 to 22 weeks. A correlation and regression analysis was performed for placental volume (PV) and vascular indices versus clinical and sonographic variables. Results: All vascular indices of the second-trimester were significantly greater than values of the first-trimester. Placental vascular indices showed an incremental tendency with birth weight, which was only statistically significant when the flow index (FI) of the firsttrimester was considered (P=0.02). The PV of both the first- and second-trimester has a negative correlation with FI of the secondtrimester. Conclusion: Our findings suggest that FI of the placenta in the first-trimester significantly affects growth of the fetus and placenta, likely reflecting the degree of placental vascularization during the first-trimester.

Accuracy and noise analyses of 3D vibration measurements using laser Doppler vibrometer

Khalil, H.,Kim, D.,Nam, J.,Park, K. ELSEVIER 2016 MEASUREMENT -LONDON- Vol.94 No.-

The in-plane and out-of-plane vibration components are used for 3D vibration measurements. The latter can be calculated by using three laser scanning vibrometers (LSVs) or by moving a single LSV to three different locations. These vibration components are calculated from the vibration signals measured at each of the three locations and the angles between the local coordinates and the LSV locations. The accuracy of the in-plane and out-of-plane vibration components can be degraded depending on the measurement angle. In addition to accuracy, the noise contained in the LSV can be amplified depending on the measurement angle. Hence, it is necessary to implement an analysis methodology for the angles, which is conducted for 2D vibration measurements first before extended to 3D. Finally, experiments are performed for both 2D and 3D at small and appropriate angles, and the elicited results are compared to those elicited using a 3D accelerometer.

3D Radar Objects Tracking and Reflectivity Profiling

Yong Hyun Kim,Hansoo Lee,Sungshin Kim 한국지능시스템학회 2012 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.12 No.4

The ability to characterize feature objects from radar readings is often limited by simply looking at their still frame reflectivity, differential reflectivity and differential phase data. In many cases, time-series study of these objects’" reflectivity profile is required to properly characterize features objects of interest. This paper introduces a novel technique to automatically track multiple 3D radar structures in C,Sband in real-time using Doppler radar and profile their characteristic reflectivity distribution in time series. The extraction of reflectivity profile from different radar cluster structures is done in three stages: 1. static frame (zone-linkage) clustering, 2. dynamic frame (evolutionlinkage) clustering and 3. characterization of clusters through time series profile of reflectivity distribution. The two clustering schemes proposed here are applied on composite multi-layers CAPPI (Constant Altitude Plan Position Indicator) radar data which covers altitude range of 0.25 to 10 km and an area spanning over hundreds of thousands km2. Discrete numerical simulations show the validity of the proposed technique and that fast and accurate profiling of time series reflectivity distribution for deformable 3D radar structures is achievable.

Experimental Study on the Element-Specific Positron Annihilation Spectroscopy

김용민,Junhyun Kwon,HamdyF. Mohamed,MoonJoo Hyun,Changsun Kang 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6

Coincidence Doppler-broadening (CDB) and positron annihilation lifetime (PAL) techniques have been applied to study 12 pure elements. The existence of open-type defects was investigated in the elements. The characteristic features of the high-momentum part of the CDB spectra for elemental metals with/without defects were investigated. By normalizing the CDB spectra to the CDB spectrum of well-annealed Ti, ratio-curves are presented. The moment region range (12×10-3 moc < PL < 20 × 10-3 moc) was elucidated and provided important information on the elemental specificity. An empirical relation that linked the positron anities and the atomic number to the shape of the high-momentum part of the CDB spectra for 3-d elements was derived. The results imply that elements (closely located in the periodic table) can be identified from an analysis of the CDB spectra. Coincidence Doppler-broadening (CDB) and positron annihilation lifetime (PAL) techniques have been applied to study 12 pure elements. The existence of open-type defects was investigated in the elements. The characteristic features of the high-momentum part of the CDB spectra for elemental metals with/without defects were investigated. By normalizing the CDB spectra to the CDB spectrum of well-annealed Ti, ratio-curves are presented. The moment region range (12×10-3 moc < PL < 20 × 10-3 moc) was elucidated and provided important information on the elemental specificity. An empirical relation that linked the positron anities and the atomic number to the shape of the high-momentum part of the CDB spectra for 3-d elements was derived. The results imply that elements (closely located in the periodic table) can be identified from an analysis of the CDB spectra.

In vivo Evaluation of Flow Estimation Methods for 3D Color Doppler Imaging

Yoo, Yang-Mo The Korean Society of Medical and Biological Engin 2010 의공학회지 Vol.31 No.3

In 3D ultrasound color Doppler imaging (CDI), 8-16 pulse transmissions (ensembles) per each scanline are used for effective clutter rejection and flow estimation, but it yields a low volume acquisition rate. In this paper, we have evaluated three flow estimation methods: autoregression (AR), eigendecomposition (ED), and autocorrelation combined with adaptive clutter rejection (AC-ACR) for a small ensemble size (E=4). The performance of AR, ED and AC-ACR methods was compared using 2D and 3D in vivo data acquired under different clutter conditions (common carotid artery, kidney and liver). To evaluate the effectiveness of three methods, receiver operating characteristic (ROC) curves were generated. For 2D kidney in vivo data, the AC-ACR method outperforms the AR and ED methods in terms of the area under the ROC curve (AUC) (0.852 vs. 0.793 and 0.813, respectively). Similarly, the AC-ACR method shows higher AUC values for 2D liver in vivo data compared to the AR and ED methods (0.855 vs. 0.807 and 0.823, respectively). For the common carotid artery data, the AR provides higher AUC values, but it suffers from biased estimates. For 3D in vivo data acquired from a kidney transplant patient, the AC-ACR with E=4 provides an AUC value of 0.799. These in vivo experiment results indicate that the AC-ACR method can provide more robust flow estimates compared to the AR and ED methods with a small ensemble size.

3D Radar Objects Tracking and Reflectivity Profiling

김용현,이한수,김성신 한국지능시스템학회 2012 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.12 No.4

The ability to characterize feature objects from radar readings is often limited by simply looking at their still frame reflectivity, differential reflectivity and differential phase data. In many cases, time-series study of these objects’ reflectivity profile is required to properly characterize features objects of interest. This paper introduces a novel technique to automatically track multiple 3D radar structures in C,S-band in real-time using Doppler radar and profile their characteristic reflectivity distribution in time series. The extraction of reflectivity profile from different radar cluster structures is done in three stages: 1. static frame (zone-linkage) clustering, 2. dynamic frame (evolution-linkage) clustering and 3. characterization of clusters through time series profile of reflectivity distribution. The two clustering schemes proposed here are applied on composite multi-layers CAPPI (Constant Altitude Plan Position Indicator) radar data which covers altitude range of 0.25 to 10 km and an area spanning over hundreds of thousands km2. Discrete numerical simulations show the validity of the proposed technique and that fast and accurate profiling of time series reflectivity distribution for deformable 3D radar structures is achievable.

Uterine blood flow indices, antinuclear autoantibodies and unexplained recurrent miscarriage

( A. Pietropolli ),( Valentina Bruno ),( M. V. Capogna ),( S. Bernardini ),( E. Piccione ),( C. Ticconi1 ) 대한산부인과학회 2015 Obstetrics & Gynecology Science Vol.58 No.6

Objective To study the correlation between 2D and 3D uterine flow indexes and the presence or the absence of antinuclear antibodies (ANA) in women with unexplained recurrent miscarriage (uRM). Methods Fifty-two subjects (26 uRM and 26 control women) underwent 2D Doppler measurement of pulsatility index and resistance index of the uterine arteries in both the follicular and midluteal phase of the cycle. Additionally, 3D ultrasonography determination of vascularisation index, flow index, and vascularisation flow index was carried out with the aid of the VOCAL technique. Serum assay for the presence of ANA was performed in all women. Results Pulsatility index of ANA+ uRM women was higher than that of ANA- uRM women and control ANA+ and ANAwomen, both in the follicular and in the midluteal phase of the cycle. Vascularisation index in ANA- uRM women was significantly higher than that in ANA+ control women. Flow index in uRM ANA+ women was significantly lower than that of each of the other groups. Conclusion ANA might be involved in uRM by determining an impairment in uterine blood flow hemodynamic, particularly in uterine blood flow intensity and uterine artery impedance.

3-D Vibration Measurement Using a Single Laser Scanning Vibrometer by Moving to Three Different Locations

Dongkyu Kim,Hajun Song,Khalil, Hossam,Jongsuh Lee,Semyung Wang,Kyihwan Park IEEE 2014 IEEE transactions on instrumentation and measureme Vol.63 No.8

<P>3-D vibration measurement is achieved using a single laser scanning vibrometer (LSV) and laser scanner (LS) by moving them to three arbitrarily different locations from the principle that vibration analysis based on the frequency domain is independent of the vibration signal based on time domain. The proposed system has the same effect as using three sets of LSVs, and has an advantage of reducing equipment costs. Analytical approach of obtaining in-plane and out-of-plane vibration of surface is introduced using geometrical relations between three LSV coordinates and vibrations measured at three different locations. The proposed algorithm is verified by comparing the experimental results obtained by a three-axis accelerometer and a developed optical system with an LSV and an LS combined together.</P>

한대의 LSV 를 이용한 3 차원 진동측정방법

김동규(Dongkyu Kim),송하준(Hajun Song),박기환(Kyihwan Park) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4

3D vibration measurement is achieved using one laser scanning vibrometer(LSV) and Laser scanner(LS) by moving the LSV to three arbitrarily locations from the principle that vibration analysis based on the frequency domain is independent of the vibration signal based on time domain. The proposed system has the same effect as using three sets of LSVs. It has an advantage of reducing equipment costs. Analytical approach of obtaining in-plane and out-of-plane vibration of surface is introduced using geometrical relations between three LSV coordinates and vibration measured at three different locations

3D Radar Objects Tracking and Reflectivity Profiling

Kim, Yong Hyun,Lee, Hansoo,Kim, Sungshin Korean Institute of Intelligent Systems 2012 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.12 No.4

The ability to characterize feature objects from radar readings is often limited by simply looking at their still frame reflectivity, differential reflectivity and differential phase data. In many cases, time-series study of these objects' reflectivity profile is required to properly characterize features objects of interest. This paper introduces a novel technique to automatically track multiple 3D radar structures in C,S-band in real-time using Doppler radar and profile their characteristic reflectivity distribution in time series. The extraction of reflectivity profile from different radar cluster structures is done in three stages: 1. static frame (zone-linkage) clustering, 2. dynamic frame (evolution-linkage) clustering and 3. characterization of clusters through time series profile of reflectivity distribution. The two clustering schemes proposed here are applied on composite multi-layers CAPPI (Constant Altitude Plan Position Indicator) radar data which covers altitude range of 0.25 to 10 km and an area spanning over hundreds of thousands $km^2$. Discrete numerical simulations show the validity of the proposed technique and that fast and accurate profiling of time series reflectivity distribution for deformable 3D radar structures is achievable.