• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.11a
• /
• pp.123-123
• /
• 2002

• 대한핵의학회:학술대회논문집
• /
• 1989.06a
• /
• pp.123.1-123.1
• /
• 1989

• The Zoological Society Korea : Newsletter
• /
• v.12 no.2
• /
• pp.123.1-123
• /
• 1995

• The Zoological Society Korea : Newsletter
• /
• v.12 no.2
• /
• pp.123.2-123
• /
• 1995

• Progress in Superconductivity
• /
• v.10 no.2
• /
• pp.133-138
• /
• 2009

The $Nd_{1+x}Ba_{2-x}Cu_3O_{7-{\delta}}$(Nd123) superconductor exhibits high performance in high magnetic field and high temperature. We have studied phase stability for Nd123 under reduced oxygen partial pressure and various heat-treatment conditions. The main phase is Nd123 and some samples contain small amounts of Nd422 depending on the temperature and oxygen partial pressure. The decomposition temperature decreases with decreasing oxygen partial pressure from $1052^{\circ}C(P(O_2)$=150 Torr) to about $845^{\circ}C(P(O_2)$=0.1 Torr). The liquidus line was steeper temperature with decreasing oxygen partial pressure. In same condition of oxygen partial pressure, the region of stable Nd123 phase was formed at slightly higher temperature than the region of stable YBCO phase.

• Bulletin of the Korean Chemical Society
• /
• v.33 no.6
• /
• pp.1890-1894
• /
• 2012

Vascular endothelial growth factor (VEGF) and its receptor (VEGFR) have been implicated in the pathogenesis of rheumatoid arthritis, which is angiogenesis dependent. Antibody-based molecular imaging improves targeting, and antibody radiolabeling is useful for monitoring biological events $in$ $vivo$ $via$ PET or SPECT. We investigated the potential of molecular imaging to diagnose arthritis with VEGFR-2 $in$ $vivo$. The $^{123}I$-VEGFR-2 antibody was prepared by the iodogen tube method. The radioligand was injected into arthritic mice, and micro SPECT/CT was performed. The arthritic mice were examined by 4.7-T MRI and immunohistochemistry. The $^{123}I$-VEGFR-2 antibody showed high uptake in the arthritic region at 1 h postinjection on SPECT/CT but no uptake in the control animals after radioligand injection. In MR images, the arthritic tissue of the mice was correlated with regions labeled by the $^{123}I$-VEGFR-2 antibody. Immunohistochemical localization showed markedly increased expression of VEGFR-2 in the endothelial cells, fibroblasts, and macrophages of the arthritic mice.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2014.05a
• /
• pp.816-818
• /
• 2014

Gas target chamber has been developed for producing $^{123}I$ which is radiopharmaceuticals for diagnosis of thyroid cancer, and modeled how to occur nuclear reaction between chamber and $^{124}Xe$ with energy 30MeV inside the gas target chamber by using the MCNPX. The beam energy was lost as the beam spread when beam hit inside the gas target chamber. The cooling water was used not to change the gas target chamber as loss of energy transfer to the thermal energy. Spiral cooling line was designed for cooling the target chamber efficiently. By using the c30 cyclotron, $^{124}Xe(p,2n)$, $^{124}Xe(p,n)$, $^{124}Xe(p,pn)$ nuclear reactions were studied. In this study, we predict the production yield.

• The Korean Journal of Nuclear Medicine
• /
• v.29 no.1
• /
• pp.92-97
• /
• 1995

감염병소와 진단을 위해 여러 방사성성핵종 표지 사람비특이항체들이 임상이용되었으나, $^{123}I,\;^{99m}Tc,\;^{111}In$등 표지 핵종과 표지방법에 따른 체내동태의 차이에 대한 자료가 필요하며, 감염병소의 진단에 표준적으로 이용되어지던 $^{111}In$-oxine표지백혈구와 비교평가도 요구된다. 저자들은 $10^9$개의 포도상구균을 좌측 대퇴부에 주사하여 농양을 유발한 백서에서 $^{123}In$ 표지, iminothiolane을 이용한 $^{99m}Tc$ 표지, DTPA이용 $^{111}In$ 표지 사람비특이항체와 $^{111}In$-oxine 표지 백혈구의 체내동태 및 농양섭취율을 비교하였다. $^{123}In$-IgG는 갑상선 및 위의 방사능이 높아 체내 탈요드반응이 빠름이 시사되었으며, $^{99m}Tc$-iminothiolane IgG는 신장방사능이 높아 신장으로 IgG 또는 대사물이 배설됨을 알 수 있었다. $^{111}In$-oxine표지 백혈구는 간 및 비장의 방사능이 높았고, 혈액방사능 제거율이 가장 빨랐다. 주사 24시간 후의 농양섭취율은 $^{111}In$-DTPA IgG가 가장 높았고, 농양 대 혈액 방사능비는 $^{111}In$-oxine표지 백혈구가 가장 높았으며, $^{111}In$-DTPA IgG와 $^{99m}Tc$-iminothiolane IgG가 다음으로 비슷하였다. $^{111}In$-oxine표지 백혈구보다는 방사성핵종표지 IgG가 간편하게 이용될 수 있으며, $^{111}In$ 이 $^{99m}Tc$나 $^{123}In$보다 지연영상의 촬영에 유리함을 알 수 있었다.

• Nuclear Medicine and Molecular Imaging
• /
• v.41 no.4
• /
• pp.272-279
• /
• 2007

Purpose: The aim of this study was to evaluate the discriminating nature of $^{123}I-FP-CIT$ SPECT in patients with parkinsonism. Methods: $^{123}I-FP-CIT$ SPECT images acquired from the 18 normal controls; NC ($60.4{\pm}10.0$ yr) and 237 patients with parkinsonism ($65.9{\pm}9.2$ yr) were analyzed. From spatialIy normalized images, regional counts of the caudate, putamen, and occipital lobe were obtained using region of interest method. Binding potential (BP) was calculated with the ratio of specific to nonspecific binding activity at equilibrium. Additionally, the BP ratio of putamen to caudate (PCR) and asymmetric Index (ASI) were measured. Results: BPs of NC $3.37{\pm}0.57,\; 3.10{\pm}0.41,\; 3.23{\pm}0.48$ for caudate, putamen, whole striatum, respectively) had no significant difference with those of essential tremor; ET ($3.31{\pm}0.64,\; 3.06{\pm}0.61,\; 3.14{\pm}0.63$) and Alzheimer's disease; AD (3.33 $\pm$0.60, 3.29$\pm$0.79, 3.31$\pm$0.70), but were higher than those of Parkinson's disease; PD (1.92$\pm$0.74, 1.39$\pm$0.68, 1.64$\pm$0.68), multiple system atrophy; MSA (2.36$\pm$1.07, 2.16$\pm$0.91, 2.26$\pm$0.96), and dementia with Lewy body; DLB (1.95$\pm$0.72, 1.64$\pm$0.65, 1.79$\pm$0.66)(p<0.005). PD had statisticalIy lower values of PER and higher values of ASI than those of NC (p<0.005). And PD had significantIy lower value of PCR, higher ASI and lower BP in the putamen and whole striatum than MSA (p<0.05). Conclusion: Dopamine transporter image of $^{123}I-FP-CIT$ SPECT was a good value in differential diagnosis of parkinsonism.

• The Korean Journal of Nuclear Medicine
• /
• v.37 no.4
• /
• pp.235-244
• /
• 2003

Purpose: Attention deficit hyperactivity disorder (ADHD) has been known as psychiatric disorder in childhood associated with dopamine dysregulation. In present study, we investigated changes in dopamine transporter (DAT) density of the basal ganglias using I-123 N-(3-iodopropen-2-yl) -2-carbomethoxy-3beta-(4-chlorophenyl) tropane [I-123 IPT] SPECT in children with ADHD before and after methylphenidate treatment. Materials and Method: Nine drug-naive children with ADHD and seven normal children were included in the study. We peformed brain SPECT two hours after the intravenous administration of I-123 IPT and made both quantitative and qualitative analyses using the obtained SPECT data, which were reconstructed for the assessment of soecific/nonspecific DAT binding ratios in the basal ganglia. All children with ADHD reperformed [123I]IPT SPECT after treatment with methylphenidate(0.7mg/kg/d) during about 8 weeks. SPECT data reconstructed for the assessment of specific/nonspecific DAT binding ratio of the basal ganglia were compared between before and after treatment methylphenidate. We investigated correlation between the change of ADHD symptom severity assessed with ADHD rating scale-IV and specific/nonspecific DAT binding ratio of basal ganglia. Results: Children with ADHD had a significantly greater specificinonspecific DAT binding ratio of the basal ganglia comparing to normal children(Right : z = 2.057, p = 0.041 : Left : z : 2.096, p = 0.032). Under treatment with methylphenidate in all children with ADHD, specificinonspecific DAT binding ratio of both basal ganglia decreased significantly greater than before treatment with methylphenidate (Right : t = 3.239, p = 0.018 ; Left : t = 3.133, p = 0.020). However, no significant correlation between the change of ADHD symptom severity scores and specific/nonspecific DAT binding ratio of the basal ganglia were found. Conclusions: These findings support the complex dysregulation of the dopaminergic neurotransmitter system in children with ADHD.