• Title/Summary/Keyword: CT complex

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Arbitrary Cross Sectional Display from Three-dimensional Reconstructed Image by Hierarchical Model (계층적 모델에 의한 3차원 재구성 영상의 임의단면 표시)

  • 유선국;김선호
    • Journal of Biomedical Engineering Research
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    • v.10 no.2
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    • pp.157-164
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    • 1989
  • Three-dimensional imaging and manipulation of CT data are becoming increasingly important for deterRing the complex structure and pathologies. Octree which is a hierarchical data model is used to reconstruct three- dimensional objects from CT scans. Orthogonal cross sections are displayed by traverse the octree partially. Arbitrary oblique planes are derived by intersecting the square region of plane and cubic volume of octal node. Thia method enables the display of multi-structured complex organ ann the realization by personal computer.

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Shock Thyroid in a Patient with Septic Shock: A Case Report and Literature Review (패혈성 쇼크 환자에서 동반된 쇼크 갑상샘: 증례 보고 및 문헌 고찰)

  • Wang Hyon Kim;Min Seon Kim;Jun Ho Kim;Kyung Hee Lee;Jung Hwan Lee
    • Journal of the Korean Society of Radiology
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    • v.82 no.5
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    • pp.1328-1333
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    • 2021
  • Shock thyroid is a rare manifestation of the CT hypotension complex and can be diagnosed when thyroid and perithyroidal edemas are observed on CT during the onset of shock. Shock thyroid can be a useful CT sign for decompensated shock. This condition is reversible and recovers rapidly with adequate treatment. We present the case of an 84-year-old female with septic shock, exhibiting CT features consistent with a shock thyroid. We also reviewed the clinical and radiological findings reported in the literature. The present case emphasizes that shock thyroid can be an early indicator of impending hemodynamic instability and has important prognostic and therapeutic implications.

Synthesis, Characterization and DNA Interaction Studies of (N,N'-Bis(5-phenylazosalicylaldehyde)-ethylenediamine) Cobalt(II) Complex

  • Sohrabi, Nasrin;Rasouli, Nahid;Kamkar, Mehdi
    • Bulletin of the Korean Chemical Society
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    • v.35 no.8
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    • pp.2523-2528
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    • 2014
  • In the present study, at first, azo Schiff base ligand of (N,N'-bis(5-phenylazosalicylaldehyde)-ethylenediamine) ($H_2L$) has been synthesized by condensation reaction of 5-phenylazosalicylaldehyde and ethylenediamine in 2:1 molar ratio, respectively. Then, its cobalt complex (CoL) was synthesized by reaction of $Co(OAc)_2{\cdot}4H_2O$ with ligand ($H_2L$) in 1:1 molar ratio in ethanol solvent. This ligand and its cobalt complex containing azo functional groups were characterized using elemental analysis, $^1H$-NMR, UV-vis and IR spectroscopies. Subsequently, the interaction between native calf thymus deoxyribonucleic acid (ct-DNA) and CoL complex was investigated in 10 mM Tris/HCl buffer solution, pH = 7 using UV-vis absorption, thermal denaturation technique and viscosity measurements. From spectrophotometric titration experiments, the binding constant of CoL complex with ct-DNA was found to be $(2.4{\pm}0.2){\times}10^4M^{-1}$. The thermodynamic parameters were calculated by van't Hoff equation.The enthalpy and entropy changes were $5753.94{\pm}172.66kcal/mol$ and $43.93{\pm}1.18cal/mol{\cdot}K$ at $25^{\circ}C$, respectively. Thermal denaturation experiments represent the increasing of melting temperature of ct-DNA (about $0.93^{\circ}C$) due to binding of CoL complex. The results indicate that the process is entropy-driven and suggest that hydrophobic interactions are the main driving force for the complex formation.

Requirement Analysis of Search Browser for Efficient Searching of Clinical Terminology (의학용어의 효율적인 검색을 위한 검색 브라우저의 요건 분석)

  • Ryu, Wooseok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.11
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    • pp.2691-2696
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    • 2014
  • SNOMED CT is a standard clinical terminology to provide a standardized way to record and manage clinical records for EMR or EHR. The structure of SNOMED CT is very complex because of huge expressive power and its internal design mechanism. Although there are some SNOMED CT browsers for browsing and searching SNOMED CT concepts, they are less effective because they do not consider such complexity of SNOMED CT. This paper depicts problems of current SNOMED CT browsers and analyze SNOMED CT dataset. Then, this paper analyze requirements of SNOMED CT browser which improves searching and selecting of appropriate clinical terms.

The Clinical Usefulness of Halo Sign on CT Image of Trauma Patients (외상환자의 전산화 단층촬영소견에서 나타난 달무리 소견의 임상적 유용성)

  • Lee, Seung Yong;Sohn, You Dong;Ahn, Hee Cheol;Kang, Gu Hyun;Choi, Jung Tae;Ahn, Moo Eob;Seo, Jeong Youl
    • Journal of Trauma and Injury
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    • v.20 no.2
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    • pp.144-148
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    • 2007
  • Purpose: The management of hemorrhagic shock is critical for trauma patients. To assess hemorrhagic shock, the clinician commonly uses a change in positional blood pressure, the shock index, an estimate of the diameter of inferior vena cava based on sonography, and an evaluation of hypoperfusion complex shown on a CT scan. To add the finding for the hypoperfusion complex, the 'halo sign' was introduced recently. To our knowledge, this 'halo sign' has not been evaluated for its clinical usefulness, so we designed this study to evaluate its usefulness and to find the useful CT signs for hypoperfusion complex. Methods: The study was done from January 2007 to May 2007. All medical records and CT images of 124 patients with trauma were reviewed, of which 103 patients were included. Exclusion criteria was as follows: 1) age < 15 year old and 2) head trauma score of AIS ${\geq}$ 5. Results: The value of kappa, to assess the inter-observer agreement, was 0.51 (p < 0.001). The variables of the halo-sign-positive group were statistically different from those of the halo-sign-negative group. The rate of transfusion for the halo-sign-positive group was about 10 times higher than that of the halo-sign-negative group and the rate of mortality was about 6 times higher. Conclusion: In the setting of trauma, early abdominal CT can show diffuse abnormalities due to hypoperfusion complex. Recognition of these signs is important in order to prevent an unwanted outcome in hemorrhagic shock. We conclude that the halo sign is a useful one for hypoperfusion complex and that it is useful for assessing the degree of hemorrhagic shock.

SKEW COMPLEX SYMMETRIC OPERATORS AND WEYL TYPE THEOREMS

  • KO, EUNGIL;KO, EUNJEONG;LEE, JI EUN
    • Bulletin of the Korean Mathematical Society
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    • v.52 no.4
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    • pp.1269-1283
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    • 2015
  • An operator $T{{\in}}{\mathcal{L}}({\mathcal{H}})$ is said to be skew complex symmetric if there exists a conjugation C on ${\mathcal{H}}$ such that $T=-CT^*C$. In this paper, we study properties of skew complex symmetric operators including spectral connections, Fredholmness, and subspace-hypercyclicity between skew complex symmetric operators and their adjoints. Moreover, we consider Weyl type theorems and Browder type theorems for skew complex symmetric operators.

The Evaluation of Carotid Artery Stenosis Using Spiral CT. (Spiral CT를 이용한 경동맥 질환의 평가)

  • Yoon, Hee-Suk;Hwang, Yun-Chean;Shin, Hyun-Kil;Beak, Cheon-Ki;Yoon, Suck-Min
    • Journal of radiological science and technology
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    • v.19 no.2
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    • pp.45-49
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    • 1996
  • To determine the utility of spiral computed tomography(CT) in the evaluation of carotid artery stenosis, spiral CT images of 10 patients were compared with both ones of conventional angiography and magnetic resonance(MR) angiography. The severeness of stenosis was determined for each Internal carotid artery on the basis of arterial narrowness : mild stenosis : 40 % or less, moderate stenosis = $40{\sim}70%$, severe stenosis = greater than 70 % of arterial narrowness. The short examination and clear depiction of the arterial lumen In areas of complex or low flow make CT angiography attractive alternative to MR angiography. Spiral CT angiography shows normal and abnormal carotid anatomy well when compared with conventional anglography.

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Comparison of the Usefulness of MDCT (Multidetective Computed Tomogram) in Facial Bone Fractures (안면부 골절 수술 전후 다중검출기 전산화 단층촬영의 효용성 비교)

  • Hong, Yoon Gi;Kim, Hyung Taek
    • Journal of Trauma and Injury
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    • v.19 no.1
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    • pp.28-34
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    • 2006
  • Purpose: In maxillofacial surgery, proper preoperative diagnosis is very important in achieving good postoperative results. Although conventional CT scans are useful for visual representations of fractures, they cannot provide direct guidance for reconstructing facial bone fractures. However, the recent technology of multislice scanning has brought many clinical benefits to CT images. Direct correlations can be made between preoperative imaging data and operative planning. The aim of the current study is to evaluate the differences between conventional CT and multidetective three-dimensional CT(3D MDCT) measurements in craniofacial deformities. Methods: From January 2005 to November 2005, MDCT scans of 41 patients were evaluated by comparing them with conventional CT scans. The 3D MDCT images were assessed and reviewed by using a simple scoring system. Results: The 3D MDCT scans offered easy interpretation, facilitated surgical planning, and clarified postoperative results in malar complex fractures, mandibular fractures, and extensive maxillofacial fractures and cranioplasty. However, 3D MDCT images were not superior to conventional CT scans in the diagnosis of blowout fractures. Conclusion: In spite of its limitations, the 3D MDCT provided additional and more comprehensive information than the conventional CT for preoperative assessment of craniofacial deformities. Therefore, the 3D MDCT can be a useful tool for diagnosis and systematic treatment planning in craniofacial skeletal deformities.

Tetrahedral Mesh Generation from CT Images of Thoracic Vertebra (흉추 CT 영상으로부터 사면체 요소망의 자동생성)

  • 박정민;권기환;전성재;채수원;이관행;이태수;서중근;박정율
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.150-153
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    • 2002
  • The use of the finite element method for biomechanical analysis is increasing rapidly in recent years. Since biomechanical models are usually in very complex shapes, it takes a lot of time and efforts to build reasonable finite element models. In this paper, a new tetrahedral meshing algorithm from the series of 2-D computed tomography(CT) images has been proposed. In this scheme, the planar sections of three-dimensional objects and the side surfaces between two planar sections are triangulated first, and then an advancing front algorithm is employed to construct tetrahedral elements by using basic operators. A sample finite element model for thoracic vertebra is presented.

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A Study on the Effectiveness of CT-TDPS Learning Model in Problem Solving Programming using Scratch (스크래치를 이용한 문제해결 프로그래밍에서 CT-TDPS 학습 모형의 효과성 연구)

  • Kim, Young-Jik;Kim, Seong-Sik
    • The Journal of Korean Association of Computer Education
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    • v.23 no.3
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    • pp.41-47
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    • 2020
  • Computational Thinking(CT) is drawing attention as a core competency required for future talent in the 21st century. Software education for improving CT ability at home and abroad is in full swing. Among them, problem-solving programming education helps to improve CT ability. The CT-TDPS learning model follows the decomposition, abstraction thinking process, which modularizes complex problems, and the Agile development method, which is an iterative and incremental programming method to implement it. In this study, we tried to confirm the improvement of CT ability by applying CT-TDPS learning model to problem solving programming education using Scratch. As a result of the study, it was confirmed that in the problem solving programming education using the CT-TDPS learning model, it improved in all aspects of computing concept, computing performance, and computing perspective, which are sub-factors of CT ability. In addition, it was confirmed that there was a significant difference in the experimental group as a result of the t-test on the Dr.Scratch automatic evaluation result.