• Korean Journal of Radiology
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• 제22권12호
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• pp.1938-1945
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• 2021

Breast radiologists are increasingly seeing patients with axillary adenopathy related to COVID-19 vaccination. Vaccination can cause levels I-III axillary as well as cervical lymphadenopathy. Appropriate management of vaccine-related adenopathy may vary depending on clinical context. In patients with current or past history of malignancy, vaccine-related adenopathy can be indistinguishable from nodal metastasis. This article presents imaging findings of oncology patients with adenopathy seen in the axilla or neck on cross-sectional imaging (breast MRI, CT, or PET-CT) after COVID-19 vaccination. Management approach and rationale is discussed, along with consideration on strategies to minimize false positives in vaccinated cancer patients. Time interval between vaccination and adenopathy seen on breast MRI, CT, or PET-CT is also reported.

• 한국의학물리학회지:의학물리
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• 제18권3호
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• pp.149-160
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• 2007

초급성 허혈성 뇌졸중 환자를 대상으로 관류 전산화단층촬영(CT)의 임상적 적용을 평가하였다. 뇌졸중 증상 발현 62명의 환자를 대상으로 하였고, 관류 CT는 소뇌 기저부위에서 8 cm 상방으로 스캔하여 후처리 과정을 거쳐 뇌혈용적(cerebral blood volume, CBV), 뇌혈류량(cerebral blood flow, CBF), 평균 조영제 통과시간(mean transit time, MTT) 및 조영제 최고 도달시간(time to peak, TTP) 등의 네 가지 지도의 영상을 얻었다. 관류 CT의 CBV, CBF, MTT, TTP 지도에서 병변을 평가하였으며, 병변 부위와 정상측 대칭부위에서 MTT와 TTP를 측정하여 차이를 비교하였다. 관류 CT의 네 가지 지도 모두에서 관류결손을 인지할 수 있었고, 관류 결손이 인지되는 부위에서 MTT와 TTP의 현저한 지연이 있었다. 관류 CT의 MTT와 TTP영상이 초급성 허혈성 경계부위의 페넘브라를 반영하였다. 관류 CT의 네 가지 지도를 이용하면 뇌졸중의 조기 진단, 허혈 중심부, 허혈 페넘브라를 알 수 있게 되어 관류결손 부위의 혈류역동학적 평가가 가능함으로써, 허혈성 뇌졸중 환자의 진단 및 효과적인 치료를 위해 관류 CT가 유용하여 임상적 적용이 가능하다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.232-233
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• 2007

We manufactured Liquid Crystal Polymer (LCP) and (1-x)CaTiO3-xLaAlO3 (CT-LA) ceramic composites and investigated dielectric properties to use as embedded capacitor in printed circuit boards and replace LTCC substrate. The dielectric properties of these composites are varied with volume fraction of CT-LA and ratios of CT/LA. Dielectric constants are in the range of 3~15. In addition, we could get low TCC and High Q value that could not achieve in other ceramic-polymer composites. Especially, in composite with x=0.01 and 30 vol% CT-LA, the dieletric constant and Q-value are 10 and 200, respectively. And more TCC is $-28{\sim}300ppm/^{\circ}C$ in the temperature range of $-55{\sim}125^{\circ}C$. We think that this composites can be used high-Q substrate material like LTCC and embedded temperature compensation capacitor in printed circuit boards.

• 대한한의학회지
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• 제42권4호
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• pp.75-101
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• 2021

Objectives: ncluding stroke. The aim of this study was to systematically review the clinical evidence of CT for stroke. Methods: To identify randomized controlled trials (RCTs) reporting the effectiveness and/or safety of CT, seven databases including PubMed, EMBASE, and Cochrane Library were searched for articles published from January 2000 to February 2021 without language restrictions. Meta-analysis was performed using Review Manager 5.4 software and the results were presented as mean difference (MD) or standard mean difference (SMD) for continuous variables and odds ratio (OR) for diverse variables with 95% confidence intervals (CIs). Assessment of the methodological quality of the eligible trials was conducted using the Cochrane Collaboration tool for risk of bias in RCTs. Results: Twenty-two RCTs with 1653 participants were included in the final analysis. CT provided additional benefit in improving upper limb motor function (Fugl-Meyer assessment for upper limb motor function, MD 6.91, 95% CI 4.64 to 1.67, P<0.00001) and spasticity (response rate, OR 3.28, 95% CI 1.31 to 8.22, P=0.08) in stroke survivors receiving conventional medical treatment. These findings were supported with a moderate level of evidence. CT did not significantly increase the occurrence of adverse events. Conclusions: This study demonstrated the potential of CT to be beneficial in managing a variety of complications in stroke survivors. However, to compensate for the shortcomings of the existing evidence, rigorously designed large-scale RCTs are warranted in the future.

• 대한치과교정학회지
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• 제52권1호
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• pp.75-79
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• 2022

Objective: To investigate remineralizing effect of three fluoride regimens on artificially demineralized enamel around orthodontic bracket by analyzing mineral density (MD) acquired from micro-computed tomography (micro-CT). Methods: Forty-eight bracket bonded bovine incisors were prepared to create demineralized enamel (DE) surface. The samples were divided into four groups according to the fluoride regimen: 1) no fluoridation, 2) 1.23% acidulated phosphate fluoride (APF) gel, 3) fluoridated toothpaste, and 4) 0.05% sodium fluoride mouthwash. Micro-CT was scanned after demineralization (T0), and 2 weeks (T1) and 4 weeks (T2) of fluoridation. Results: APF gel showed highest remineralization of DE during T1-T0 interval among the groups (p < 0.05); followed by toothpaste, mouthwash and no fluoridation. APF gel and toothpaste demonstrated significant increase in MD after 4 weeks of application (p < 0.05). Conclusions: Remineralization effects of three fluoride regimens were depicted through micro-CT analysis, of which APF gel was most effective.

• 한국방사선학회논문지
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• 제6권4호
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• pp.275-279
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• 2012

16MD CT(n=93) and dual source CT(n=100)를 이용해 촬영된 심장 CT 중 그 결과 협착으로 진단되어 심장영화 촬영을 시행한 환자를 대상으로 심장영화 촬영과의 협착 유무에 대한 비교를 하였다. 그 결과 16MDCT의 경우 가장 높은 민감도, 특이도, 양성예측도, 음성예측도는 LAD(73.5%), RCA(74.5%), LAD(66.7%), LCX(75%), LCX(67.7%)로 나타났고, 16Slice MDCT에서 각 관상동맥 혈관별 정확도는 평균67%로 다소 떨어지는 것으로 나타났고, Somatom Definition dual source CT의 경우 평균 정확도 84%로 16Slice MDCT보다는 17%더 높은 정확도를 나타내었다. 관상동맥영역별(segaments) 구분에서는 16Slice MDCT와 Somatom Definition 모두 근위부(proximal)보다는 원위부로 갈수록 더 높은 정확도를 나타내었다. 하지만 그 결과 값이 10% 오차 범위 내에 있어 명확한 차이라 보기는 힘들 것 이다. 또한 Dual source CT의 경우 역시 관상동맥 영역별 구분에서 큰 차이를 보이지 않았다.

• 대한한의학회지
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• 제44권2호
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• pp.201-201
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• 2023

Objectives: Cupping therapy (CT) has been widely used in traditional medicine worldwide for various indications, including stroke. The aim of this study was to systematically review the clinical evidence of CT for stroke. Methods: To identify randomized controlled trials (RCTs) reporting the effectiveness and/or safety of CT, seven databases including PubMed, EMBASE, and Cochrane Library were searched for articles published from January 2000 to February 2021 without language restrictions. Meta-analysis was performed using Review Manager 5.4 software and the results were presented as mean difference (MD) or standard mean difference (SMD) for continuous variables and odds ratio (OR) for diverse variables with 95% confidence intervals (CIs). Assessment of the methodological quality of the eligible trials was conducted using the Cochrane Collaboration tool for risk of bias in RCTs. Results: Twenty-two RCTs with 1653 participants were included in the final analysis. CT provided additional benefit in improving upper limb motor function (Fugl-Meyer assessment for upper limb motor function, MD 6.91, 95% CI 4.64 to 1.67, P<0.00001) and spasticity (response rate, OR 3.28, 95% CI 1.31 to 8.22, P=0.08) in stroke survivors receiving conventional medical treatment. These findings were supported with a moderate level of evidence. CT did not significantly increase the occurrence of adverse events. Conclusions: This study demonstrated the potential of CT to be beneficial in managing a variety of complications in stroke survivors. However, to compensate for the shortcomings of the existing evidence, rigorously designed large-scale RCTs are warranted in the future.

• Korean Journal of Radiology
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• 제25권9호
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• pp.843-850
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• 2024

Radiation recall pneumonitis is an inflammatory reaction of previously radiated lung parenchyma triggered by systemic pharmacological agents (such as chemotherapy and immunotherapy) or vaccination. Patients present with non-specific symptoms such as cough, shortness of breath, or hypoxia soon after the initiation of medication or vaccination. Careful assessment of the patient's history, including the thoracic radiation treatment plan and timing of the initiation of the triggering agent, in conjunction with CT findings, contribute to the diagnosis. Once a diagnosis is established, treatment includes cessation of the causative medication and/or initiation of steroid therapy. Differentiating this relatively rare entity from other common post-therapeutic complications in oncology patients, such as recurrent malignancy, infection, or medication-induced pneumonitis, is essential for guiding downstream clinical management.

• Archives of Plastic Surgery
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• 제35권4호
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• pp.379-384
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• 2008

Purpose: Currently, using perforator artery flaps especially anterolateral thigh flaps are widely used for reconstruction of extremities, head and neck. Obtaining a precise anatomical picture prior to operation will translate to a more accurate, efficient and safe procedure. Authors used 3D-image work up via 64-slice MDCT to make a more precise preoperative plan. Methods: A total of 10 patients underwent soft tissue reconstruction with anterolateral thigh flap from December 2006 to December 2007. The 64-Channel MDCT (LightSpeed VCT, GE, USA) was used and 3D images were reconstructed. Findings from MDCT were applied to the preoperative planning and confirmed with intraoperative findings. Results: The average number of perforator arteries from lateral circumflex femoral artery was 2. The average lengths of vascular pedicle from the origin of lateral circumflex femoral artery to the first and second perforator artery were 11.0 cm and 20.0 cm, respectively. The average diameter of the pedicle artery was 2.2 mm. The locations of the perforator arteries were mapped and localized on the body surface based on the MDCT result. These were confirmed through direct visualization intraoperatively. Conclusion: MDCT has an advantage of obtaining accurate images of the general anatomy and even fine structures like perforator arteries. By using this state-of-the-art diagnostic imaging technique, it is now possible to make an operative plan safely and easily.

• Fisheries and Aquatic Sciences
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• 제24권7호
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• pp.235-242
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• 2021

The present study investigated the critical thermal maxima (CT_max) of red-spotted grouper, Epinephelus akaara under different acclimation temperatures (T_acc). Fish were acclimated at 24℃, 28℃, and 32℃ water temperature for 2 weeks. Water temperature was increased at a rate of 1℃/h and CT_max level was measured following the critical thermal methodology (Paladino et al., 1980). The results showed that CT_max values of E. akaara were 35.61℃, 36.83℃, and 37.65℃ for fish acclimated at 24℃, 28℃, and 32℃, respectively. The acclimation response ratio (ARR) was 0.26. The CT_max values were significantly correlated with body size. Collectively, it is said that the CT_max value of red-spotted grouper can be affected by different adaptation temperature (24℃, 28℃, and 32℃) and the fish acclimated to a higher temperature has a higher CT_max level. Besides, the CT_max value of 35.61℃-37.65℃ indicating the upper thermal tolerance limit for E. akaara under different T_acc (24℃, 28℃, and 32℃). Understanding the thermal tolerance of E. akaara is of ecological importance in the conservation of this species.