CT 검사 시 스캔 범위 내 상지 유무에 따른 영상의 질 평가(LUNG MAN 포함)

장위잉(Yuying Zhang),정하오양(Haoyang Zheng),정강교(Kang-gyo Jung),조유진(Yu-Jin Cho),조평곤(Pyong-Kon Cho) 대한방사선과학회(구 대한방사선기술학회) 2017 방사선기술과학 Vol.40 No.4

본 연구의 목적은 흉·복부 다중검출기전산화단층촬영(multi-detector computed tomography; MDCT)에서 상지를 머리 위로 위치 잡이 할 수 없는 경우 흉·복부에서 거리에 따른 인공유무를 평가하고자 하였다. 128-채널 MDCT로 흉·복부 CT를 위한 인체대상과 흉부 팬텀을 현재 임상에서 검사하고 있는 조건(120 kVp, 110 mAs, standard algorithm)으로 검사하였다. 인체 검사 시 한번은 팔을 머리 쪽으로 올리고 검사하고, 팔을 내린 후 동일한 조건으로 한 번 더 검사하였다. 흉부 팬텀 실험은 환자와 동일한 조건으로 검사를 하고, 상지팬텀을 흉·복부에서 일정한 거리(0, 3, 7 cm)를 두고 검사하였다. 목적하는 부위에 관심영역을 설정하여 CT 값, 노이즈, 신호 대 잡음비, 대조도 대 잡음비를 측정하여 평가하였다. 인체를 대상으로 획득한 영상에서 노이즈는 팔을 올렸 을 때와 비교하여 팔을 내렸을 때 지방, 갈비뼈, 근육 모두에서 증가하였다(0.79, 47.8, 27%). 팬텀 영상에서도 상 지를 아래로 내렸을 경우 근육, 폐 실질에서 노이즈가 증가하였다(31.2, 9.4%). 또한 상지의 위치가 흉･복부에서 멀어질수록(0, 3, 7 cm) 노이즈가 감소하였다. 근육에서 노이즈는 상지가 흉부와 붙어있을 경우(0 cm)를 기준으로 3 cm, 7cm 떨어졌을 때 5, 25.12% 감소하였고, 폐실질에서 5.6, 15.35% 감소하였다. 흉·복부 CT 촬영 시 갠트리 내 검사 이외의 부위(상지 등)가 위치할 경우 흉·복부로부터 약 3 cm 이상 거리를 유지시킨 후 검사를 진행하면 발생할 수 있는 인공음영을 최소화시킬 수 있을 것으로 사료된다. The purpose of this study was to evaluate whether or not there was artifact when the upper limb could not be lifted to the top of the head during multi-detector computed tomography(MDCT) scans of the chest and abdomen. Contrast radiography of the human and chest phantom was performed with 128channal MDCT. Under the same conditions(120 kVp, 110 mAs, standard algorithm)both hands lifted up and put down each time in the human experiment. In the chest phantom experiment, the radiography was carried out when the upper limb phantom was adjusted at a certain distance(0, 3, 7 cm) from the chest phantom. Subsequently, the values of Noise, CT number, SNR, and CNR were measured in the field of concern. The noise value of fat, rib, and muscle increased when the arm was lifted in humans(0.79, 47.8, 27%). Furthermore, when the upper limb was lowered, the noise value of muscle and lung increased in the phantom(31.2, 9.4%). In addition, the noise value of the muscles and lung decreased by 5, 25.12% and 5.6, 15.35% as the up-per limb moved about 0,3,7cm away from the chest. When the chest and abdominal radiography were performed, in the case of the presence of other parts outside the inspection area, the probability of artifact was minimal while the distance was more than 3cm away from the upper limb to the chest and abdomen.

SYNTHESIS AND ELECTROCHEMICAL PROPERTIES OF GRAPHENE/MnO2/CONDUCTING POLYMER TERNARY COMPOSITE FOR SUPERCAPACITORS

JINXIAN LIN,YUYING ZHENG,QIFENG DU,MINGPING HE,ZHONGWEN DENG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.1

Graphene(RGO)/MnO2/[N-butyl-3,6-carbazolevinylene-alt-(2,5-dioctyloxy)-p-phenylenevinylene] (PPH–CAR) ternary nanocomposite is fabricated by a simple two-step method, which includes electrochemical reduction of graphene oxide (GO) and oxidation of Mn(CH3COO)2 simultaneously and an ultrathin PPH–CAR layer coated on the RGO/MnO2 surface. The structure of the composite is investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electron microscopy (FESEM). The results suggest that the composite is correctly synthesized and each component has good dispersion. Cycle voltammetry (CV), charge and discharge measurements and cycle stability test are used to evaluate its electrochemical performance. Because of the synergistic effect of each component, the composite exhibits excellent electrochemical properties with specific capacitance of 175 F/g, which is a 46% increase compared with RGO/MnO2. Moreover, it reveals outstanding cycling performance with more than 90% capacitance retention over 1000 cycles. Such ternary composite is a candidate for high performance supercapacitors with great promise.

ELECTRODEPOSITION OF POLYPYRROLE/MnO2 NANOCOMPOSITE ON GRAPHITE FELT AS FREE-STANDING ELECTRODE FOR SUPERCAPACITORS

MINGPING HE,YUYING ZHENG,QIFENG DU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.2

Polypyrrole/manganese dioxide nanocomposite was deposited on graphite felt (GF) via electrodeposition to fabricate polypyrrole/manganese dioxide/graphite felt (PYMG), which can be used as novel free-standing electrode for supercapacitors. The microstructure and morphology of the as-prepared samples were characterized by Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Cyclic voltammogram (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) techniques were employed to investigate the electrochemical performance of the composites. The PYMG electrode displayed specific capacitance as high as 596.3 Fg-1 at the current density of 0.5 Ag-1, which is much higher than that of polypyrrole/manganese dioxide (PPy/MnO2) composite reported previously. The high specific capacitance of PYMG may be attributed to the fact that the porous GF is a good conductive matrix for the dispersion of PPy/MnO2 composite and it can facilitate easy access of electrolytes to the electrode, which results in enhancement of the electrochemical performance of the composite. Furthermore, the PYMG composite exhibited enhanced specific capacitance compared to MnO2/GF (MGF) and PPy/GF, which may be ascribed to the synergistic effect of PPy and MnO2.

PREPARATION AND CHARACTERIZATION OF A POLY(PYRROLYL METHANE)/MULTIWALLED CARBON NANOTUBES COMPOSITES

JINXIAN LIN,PAN WANG,YUYING ZHENG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.6

A poly(pyrrolyl methane) (Poly[pyrrole-2, 5-diyl(4-methoxybenzylidane)], PPDMOBA)/multiwalled carbon nanotubes (MWNTs) composites are fabricated by in situ chemical polycondensation of pyrrole and 4-methoxybenzaldehyde on MWNTs. The structure, morphology, thermal stability and electrical property of the resulting composites are investigated via fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and a four-probe method. The electrochemical performance of the composites is determined in a three-electrode system using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. FTIR, FESEM and TEM confirm that the composites have been successfully prepared, and PPDMOBA is uniformly dispersed in MWNTs. Electrical conductivity of PPDMOBA/MWNTs composites is 1.39 S cm-1, which is significantly larger than that of pristine PPDMOBA. The specific capacitance and charge transfer resistance of the composites is 56 F g-1 (1 mA cm-2) and 0.3Ω, respectively.

The effective mechanism of the polysaccharides from Panax ginseng on chronic fatigue syndrome

Wang, Jia,Sun, Chengxin,Zheng, Yan,Pan, Hongling,Zhou, Yifa,Fan, Yuying 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.4

Ginseng acidic polysaccharide WGPA isolated from the root of Panax ginseng C. A. Meyer was fractionated into WGPA-A and WGPA-N by anion-exchange chromatography. The antifatigue activity of ginseng acidic polysaccharide WGPA has been reported in our previous research. This present study was designed to identify its active component and elucidate the mechanism for preventing chronic fatigue syndrome (CFS). WGPA, WGPA-A and WGPA-N were orally administered to mice once daily for 15 days. The effects of these compounds on physiological biomarkers of oxidative stress and on the morphology of the mitochondria in striated skeletal muscle were assessed. The results of forced swimming test-induced indicated that WGPA and WGPA-A could lengthen the swimming time, while WGPA-N could not. In addition, malondialdehyde and lactate dehydrogenase levels in serum were enhanced; while those of superoxide dismutase and glutathione peroxidase were lowered. Interestingly, the structural degeneration of mitochondria were all ameliorated. These findings suggested that WGPA-A is the active component of WGPA, it might have potential therapeutic effects for CFS and the oxidative stress might be involved in the pathogenesis. Our results also provided essential data for a better understanding of the antifatigue effects of P. ginseng extracts.

The effective mechanism of the polysaccharides from Panax ginseng on chronic fatigue syndrome

Jia Wang,Chengxin Sun,Yan Zheng,Hongling Pan,Yifa Zhou,Yuying Fan 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.4

Ginseng acidic polysaccharide WGPA isolatedfrom the root of Panax ginseng C. A. Meyer was fractionatedinto WGPA-A and WGPA-N by anion-exchangechromatography. The antifatigue activity of ginseng acidicpolysaccharide WGPA has been reported in our previousresearch. This present study was designed to identify itsactive component and elucidate the mechanism for preventingchronic fatigue syndrome (CFS). WGPA, WGPAAand WGPA-N were orally administered to mice oncedaily for 15 days. The effects of these compounds onphysiological biomarkers of oxidative stress and on themorphology of the mitochondria in striated skeletal musclewere assessed. The results of forced swimming testinducedindicated that WGPA and WGPA-A couldlengthen the swimming time, while WGPA-N could not. Inaddition, malondialdehyde and lactate dehydrogenase levelsin serum were enhanced; while those of superoxidedismutase and glutathione peroxidase were lowered. Interestingly, the structural degeneration of mitochondriawere all ameliorated. These findings suggested thatWGPA-A is the active component of WGPA, it might havepotential therapeutic effects for CFS and the oxidative stress might be involved in the pathogenesis. Our resultsalso provided essential data for a better understanding ofthe antifatigue effects of P. ginseng extracts.

Fabrication of Mn-FeOx/CNTs Catalysts for Low-Temperature NO Reduction with NH3

Yanbing Zhang,Zhe Xu,Xie Wang,Xiulian Lu,Yuying Zheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.4

Mn-FeOx/carbon nanotubes (CNTs) catalysts were firstly prepared via simple incipient wetness method and used for low-temperature selective catalytic reduction (SCR) of NO with NH3. The structure and surface properties of the catalysts were characterized by N2 sorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction by hydrogen (H2-TPR). It was found that Mn-FeOx/CNTs catalyst exhibited excellent low-temperature SCR activity and SO2 resistance. XRD patterns revealed that metal oxides catalysts were possessed of amorphous structure. FESEM and TEM images showed that metal oxides catalysts were successfully supported on CNTs. The XPS results indicated that the obtained catalyst presented high Mn4+/Mn3+ and OS/(OS+OL) ratios. The H2-TPR profiles showed that Mn-FeOx/CNTs catalyst possessed better low-temperature reducibility. Besides, the obtained catalyst exhibited better SO2 resistance.