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    Wyświetlanie 1-12 z 12
    Tytuł:
    Automatic Extraction of the Pelvicalyceal System for Preoperative Planning of Minimally Invasive Procedures
    Autorzy:
    Heryan, K.
    Skalski, A.
    Jakubowski, J.
    Drewniak, T.
    Gajda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220364.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pelvicalyceal system segmentation
    kidney segmentation
    kidney compartments
    Computed Tomography (CT)
    kidney cancer
    Opis:
    Minimally invasive procedures for the kidney tumour removal require a 3D visualization of topological relations between kidney, cancer, the pelvicalyceal system and the renal vascular tree. In this paper, a novel methodology of the pelvicalyceal system segmentation is presented. It consists of four following steps: ROI designation, automatic threshold calculation for binarization (approximation of the histogram image data with three exponential functions), automatic extraction of the pelvicalyceal system parts and segmentation by the Locally Adaptive Region Growing algorithm. The proposed method was applied successfully on the Computed Tomography database consisting of 48 kidneys both healthy and cancer affected. The quantitative evaluation (comparison to manual segmentation) and visual assessment proved its effectiveness. The Dice Coefficient of Similarity is equal to 0.871 ± 0.060 and the average Hausdorff distance 0.46 ± 0.36 mm. Additionally, to provide a reliable assessment of the proposed method, it was compared with three other methods. The proposed method is robust regardless of the image acquisition mode, spatial resolution and range of image values. The same framework may be applied to further medical applications beyond preoperative planning for partial nephrectomy enabling to visually assess and to measure the pelvicalyceal system by medical doctors.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 3-18
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of the Computed Tomography Results of Aluminum Alloy Welded Joint
    Autorzy:
    Malicki, M.
    Sobczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/97855.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    computed tomography
    CT
    welded joints
    defects
    microcracks
    Opis:
    Computed tomography (CT) of aluminum welded joint specimen has been performed. On the tomographic cross sections some defects have been found. To verify them the metallography cross sections of welded has been done. It was found that selected defects are micro cracks.
    Źródło:
    Fatigue of Aircraft Structures; 2018, 10; 47-52
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Healed or non-healed? Computed tomography (CT) visualisation of morphology of bite trace ichnotaxa on a dinosaur bone
    Autorzy:
    Jacobsen, A. R.
    Lauridsen, H.
    Fiirgaard, B.
    Boel, L. W. T.
    Hansen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191178.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Bite traces
    dinosaur bone
    theropod
    CT
    computed tomography
    stereomicroscopy
    Opis:
    Bite traces on fossilised bones can provide important information on predator-prey relations and interactions in ancient environments. In 2009, two new ichnotaxa, Linichnus serratus and Knethichnus parallelum, were introduced to develop the application of bite traces as an ichnological tool. Ichnotaxa defined by theropod bite traces can provide useful information for understanding feeding behaviour. However, objective interpretation of possible bite traces can be difficult using traditional visual inspection. In this study, the bite traces on a fossilised dinosaur bone were comprehensively examined by correlating traditional naked-eye in spection with computed tomography (CT) imaging, used to visualise the internal morphology of the bite traces and in particular, to clarify the appearance of one possibly healed bite trace. A forensic pathologist visually examined the bone with the aid of stereomicroscopy and a radiologist analysed the CT scans. Sixteen different scanner settings were used to optimise the CT parameters and avoid signal at tenuation, in the form of hypointense artefacts in the central trabeculated part of the bone fragment. The use of CT scanning provided information on internal morphology from the vicinity of the bite trace, including hyperdense zones, not identified using visual inspection alone. By applying the extended CT scale, the dense and radiopaque cortical bone layer could be clearly identified and applied as a pathomorphological marker to correctly distinguish non-healed from healed wounds. In conclusion, the authors demonstrate that external visual examination of trace fossils by ichnologists in combination with interior examination using CT imaging can be applied to characterise ichnotaxa defined by bite traces and potentially provide clues on ancient feeding behaviour.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 3; 457-464
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of microscopy measured porosity in carbon fibbers composites
    Autorzy:
    Jędral, Arnold
    Bona, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/244963.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    porosity
    carbon fibre
    microscope
    UT
    Ultrasonic test
    CT
    computed tomography
    Opis:
    One of the most common defects in carbon fibrereinforced plastics (CFRP) is porosity. Too much of those defectscould be serious problemsto mechanical properties, which directly take effect on elements safety, like aircrafts. Therefore, the evaluation of porosity is very important test. Microscopic observations are widely used as a quality instrument in materials and constructions inspections. Cross section image of a material is easy to prepare and analyse. Porosity of a carbon fibrereinforced plasticcan be clearly spot in such kind of images. Study shows that in the most cases porosity appear between layers of fibres , rather between fibres. Unfortunately,image from microscope is only 2D picture from a small representative region. Because of that,comparison of 2D image to a real porosity distribution in all volume of a material is very difficult. To verify 2D microscopic observation method is necessary to perform another kind of tests. In this article , authors focused on non-destructive (NDT) and destructive testing methods. 2D porosity images from light microscope were compared with three different testing methods: ultrasonic test (UT), computed tomography (CT) test and constituent content of composite materials standard test method according to ASTM D3171 – 15, procedure B. Porosity results obtained from dissolution of resin from the carbon-epoxy resin sample.
    Źródło:
    Journal of KONES; 2019, 26, 4; 83-90
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blood flow in cerebral arteries – automated way from Computed Tomography to ANSYS Fluent
    Autorzy:
    Bodys, J.
    Poraj, J.
    Kryś, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/132130.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Computational Fluid Dynamics
    CFD
    blood flow
    meshing
    Computed Tomography Scan
    CT scan
    Opis:
    With the constant growth of computer simulation significance in science and engineering, many new fields are gaining access to these powerful tools. One of these new disciplines is medicine. Human body provides many fascinating areas that could be researched from completely different angle and could gain all the benefits that computer simulation offers. For example blood flow in human arteries can be studied using Computational Fluid Dynamics. Researchers of cerebrovascular disorders can get an insight view on physical phenomena of blood flow and study risk factors of embolism or cerebral aneurysm. Main issue in using computer simulation in medical research is the complexity and uniqueness of geometry that needs to be handled. After all, human body is one of the most sophisticated engineering systems created by nature. In this paper, a workflow for creating a numerical mesh for CFD simulation purposes is shown. Application shown in the example focus on cerebral arteries blood flow simulation. Numerical mesh is generated based on CT scan of patient’s head, using freeware tools Slicer3D and AutoIt3 as well as commercial software ANSYS Fluent Meshing 15.0.
    Źródło:
    Advanced Technologies in Mechanics; 2015, 2, no. 1 (2); 9-14
    2392-0327
    Pojawia się w:
    Advanced Technologies in Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods for designing and fabrication large-size medical models for orthopaedics
    Autorzy:
    Kudasik, T.
    Libura, M.
    Markowska, O.
    Miechowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/200776.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computed tomography
    CT
    orthopaedic surgery
    computer assisted surgery
    CAS
    rapid prototyping
    RP
    Opis:
    Computed tomography and rapid prototyping techniques can be used to construct and fabricate large size bone models for orthopaedics. Rapid Prototyping technology enables the fabrication of a true-to-scale bone joint model based on 3D virtual models, generated by segmenting patients’ CT images. The model can be used to plan, to simulate, to assist prosthesis implantation for difficult cases of THR (Total Hip Replacements). The main restriction of implementing such models into medical practice is high cost of their production. Physical models of pelvic bones, were constructed on the basis of data collected during standard CT examinations. A method of development of a large-size model while fulfilling the requirement for reducing the price of model fabrication in the article was presented. The method can be used for fabrication the models with 3DP technique. This paper also discusses the issue of production costs when utilizing other RP techniques as well as their usefulness in practice.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 623-627
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Denoising and Analysis Methods of Computer Tomography Results of Lung Diagnostics for Use in Neural Network Technology
    Autorzy:
    Slavova, Oleksandra
    Lebid, Solomiya
    Powiązania:
    https://bibliotekanauki.pl/articles/1833888.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    computed tomography
    CT scans analysis
    convolutional neural network
    image clustering
    image denoising
    k-means clustering
    Opis:
    Any type of biomedical screening emerges large amounts of data. As a rule, these data are unprocessed and might cause problems during the analysis and interpretation. It can be explained with inaccuracies and artifacts, which distort all the data. That is why it is crucial to make sure that the biomedical information under analysis was of high quality to omit to receive possibly wrong results or incorrect diagnosis. Receiving qualitative and trustworthy biomedical data is a necessary condition for high-quality data assessment and diagnostics. Neural networks as a computing system in data analysis provide recognizable and clear datasets. Without such data, it becomes extremely difficult to make a diagnosis, predict the course of the disease, and treatment result. The object of this research was to define, describe, and test a new approach to the analysis and preprocessing of the biomedical images, based on segmentation. Also, it was summarized different metrics for assessing image quality depending on the purpose of research. Based on the collected data, the advantages and disadvantages of each of the methods were identified. The proposed method of analysis and noise reduction was applied to the results of computed tomography lungs screening. Based on the appropriate evaluation metrics, the obtained results were evaluated quantitatively and qualitatively. As a result, the expediency of the proposed algorithm application was proven.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2020, 9, 1; 19--24
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The defect analysis of Inconel 738LC with computed tomography inspection
    Autorzy:
    Ciećko, Andrzej
    Kamiński, Łukasz
    Wierzba, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/175802.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computed tomography
    CT
    material defects
    Inconel 738LC
    tensile test
    chemical analysis
    material properties
    nondestructive
    Inconel
    Opis:
    In the present paper, computed tomography (CT) inspection is shown. The CT inspection method allowed to rate the density of defects hidden inside a material, which has a significant role in the live material. The method allows to evaluate the reliability of tensile test’s results. In our analysis, the position of crack propagation was determined by CT, and the tensile test was performed to check the accuracy of the nondestructive method. The tensile tests were performed on Inconel 738LC [1] samples.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 3; 80-83
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of reconstructing complex multi-structural anatomical objects with RP techniques
    Autorzy:
    Kudasik, T.
    Miechowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/202044.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    medical modelling
    rapid prototyping
    computed tomography
    CT
    experimental tests
    modelowanie medyczne
    szybkie prototypowanie
    tomografia komputerowa
    badania doświadczalne
    Opis:
    This article presents reconstruction methods applied to a (geometrically and physically) complex structural object with the use of RP and RT techniques. The methods are innovative due to their hybrid - multi-model and multi-material - approach to reconstruction, as well as the application of multiple technologies. An experimental analysis was conducted to verify the feasibility of rapid prototyping (RP) techniques in the reconstruction of complex internal structures using materials of diverse properties. Some RP techniques offer the possibility of discriminating between diverse objects through the use of different colours. Such models are well-suited for diagnostic purposes, for better visualisation of complex clinical problems, pathological alterations, etc. Nevertheless, they fail to fully reflect physical and mechanical properties of objects, which renders them useful in experimental analysis only to a limited extent. Their basic drawback is that they merely reflect geometrical features of the examined object. The methods discussed in the present article enable modelling multi-object structures in a single process based on the PolyJet Matrix technology and materials of different physical properties by means of a hybrid method. The article also describes the process of modelling complex anatomical structures of soft tissues and bones using models of the maxilla and the mandible as examples. The study is based on data acquired through standard computed tomography (CT). In addition, the article addresses selected aspects of CT acquisition, generation of numerical models composed of several anatomical structures (objects) and fabricating physical multi-object models.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 315-323
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current techniques of 3D reconstruction in computed tomography and magnetic resonance in diagnostic imaging of the spine
    Aktualne techniki rekonstrukcji 3D w tomografii komputerowej i rezonansie magnetycznym w diagnostyce obrazowej kręgosłupa
    Autorzy:
    Nowak, Piotr
    Dąbrowski, Mikołaj
    Kubaszewski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/12667285.pdf
    Data publikacji:
    2023-09-20
    Wydawca:
    Wydawnictwo Exemplum
    Tematy:
    3D reconstruction
    computed tomography
    magnetic resonance imaging
    fusion imaging of MRI/CT
    rekonstrukcja 3D
    tomografia komputerowa
    rezonans magnetyczny
    obrazy fuzyjne MRI/CT
    Opis:
    This review article presents an analysis of 36 scientific papers focusing on modern three-dimensional (3D) reconstruction techniques in computed tomography (CT) and magnetic resonance imaging (MRI) for their applications in medical diagnostics. The objective of this review is to present the current state of knowledge regarding the development and utilization of 3D reconstruction techniques, as well as to identify key trends and challenges in this field. The first part of the study focuses on the advancements in MRI and CT. The analysis reveals the major trends in the evolution of these diagnostic methods, such as increased accessibility of CT and MRI examinations for patients, reduced scan duration, greater utilization of artificial intelligence, and expanded applications in interventional radiology. The second part of the article highlights the potential and effectiveness of 3D modelling in diagnostic imaging. Creating 3D models of anatomical structures is a complex and multi-step process. Through the review, it was determined that 3D models derived from MRI can be equally accurate and diagnostically valuable compared to the more commonly used CT-based reconstructions. In the future, fusion imaging of MRI/CT is expected to play an increasingly significant role in orthopaedic imaging. The review demonstrates the significant potential of 3D modelling in diagnostic imaging. However, further research is still required to better understand the capabilities of 3D modelling in diagnosing complex anatomical structures. The integration of information technology in medicine will be crucial in advancing this field.
    Przedstawiono analizę 36 artykułów naukowych dotyczących nowoczesnych technik rekonstrukcji trójwymiarowych (3D) w tomografii komputerowej (CT) oraz rezonansie magnetycznym (MRI) w kontekście zastosowania tych technik w diagnostyce medycznej. Celem przeglądu jest zaprezentowanie aktualnego stanu wiedzy na temat rozwoju i zastosowania rekonstrukcji 3D oraz identyfikacja najważniejszych trendów i wyzwań w tej dziedzinie. W pierwszej części pracy skoncentrowano się na kierunkach rozwoju MRI i CT. Analiza wskazała główne trendy w ewolucji obu tych metod diagnostycznych, takie jak zwiększenie dostępności badań CT i MRI dla pacjentów, skrócenie czasu trwania badania, zwiększenie roli sztucznej inteligencji oraz szersze wykorzystanie tych modalności w radiologii interwencyjnej. Druga część pracy skupia się na możliwościach użycia modelowania 3D w diagnostyce obrazowej i jego skuteczności. Tworzenie trójwymiarowych modeli struktur anatomicznych to złożony i wieloetapowy proces. W toku przeglądu ustaliliśmy, że modele 3D uzyskane na podstawie MRI mogą być równie dokładne i posiadać podobną wartość diagnostyczną co wykorzystywane do tej pory rekonstrukcje oparte o obrazy CT. W przyszłości coraz większą rolę w diagnostyce obrazowej w ortopedii będą odgrywać obrazy fuzyjne MRI/CT. Przegląd pokazuje, że modelowanie 3D ma duży potencjał w diagnostyce obrazowej. Wciąż są jednak potrzebne dalsze badania, aby lepiej zrozumieć możliwości modelowania 3D w diagnostyce złożonych struktur anatomicznych. Wykorzystanie technologii informatycznych w medycynie będzie miało kluczowe znaczenie w tym procesie.
    Źródło:
    Chirurgia Narządów Ruchu i Ortopedia Polska; 2023, 88, 3; 103-108
    0009-479X
    2956-4719
    Pojawia się w:
    Chirurgia Narządów Ruchu i Ortopedia Polska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of skull bone structures in CT imaging
    Autorzy:
    Ryniewicz, Andrzej
    Ryniewicz, Wojciech
    Wyrąbek, Stanisław
    Bojko, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/140116.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    skull
    shape
    imaging precision
    spiral computed tomography
    CT
    reverse engineering
    czaszka
    kształt
    dokładność obrazowania
    spiralna tomografia komputerowa
    inżynieria odwrotna
    Opis:
    At the current stage of diagnostics and therapy, it is necessary to perform a geometric evaluation of facial skull bone structures basing upon virtually reconstructed objects or replicated objects with reverse engineering. The objective hereof is an analysis of imaging precision for cranial bone structures basing upon spiral tomography and in relation to the reference model with the use of laser scanning. Evaluated was the precision of skull reconstruction in 3D printing, and it was compared with the real object, topography model and reference model. The performed investigations allowed identifying the CT imaging accuracy for cranial bone structures the development of and 3D models as well as replicating its shape in printed models. The execution of the project permits one to determine the uncertainty of components in the following procedures: CT imaging, development of numerical models and 3D printing of objects, which allows one to determine the complex uncertainty in medical applications.
    Źródło:
    Archive of Mechanical Engineering; 2019, LXVI, 1; 83-95
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Texture analysis as a tool for medical decision support. P. 2 Classification of liver disorders based on computed tomography images
    Analiza tekstur jako narzędzie wspomagania decyzji medycznych. Cz. 2 Klasyfikacja patologii wątroby na obrazach tomografii komputerowej
    Autorzy:
    Duda, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/88386.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    obrazowanie medyczne
    analiza obrazów
    tekstura
    selekcja cech
    diagnoza
    wątroba
    tomografia komputerowa
    wspomaganie decyzji medycznych
    medical imaging
    image analysis
    texture
    feature selection
    computer aided diagnosis
    CAD
    medical decision support
    liver
    computed tomography
    CT
    Opis:
    Texture analysis has already demonstrated its great potential in many digital image-based diagnostic systems. It allows to extract from an image many important diagnostic information, impossible to capture with only the visual appreciation. The first attempts to use a texture analysis (TA) as a tool for characterization of an image content took place in the 70’s of the last century. Since then a variety of methods have been proposed and found their application in many domains, also – in the medical field. However, it is still difficult to indicate a method that would ensure satisfactory results for any diagnostic problem. The present work gives an overview of the texture analysis methods, that have been applied for hepatic tissue characterization from Computed Tomography (CT) images. It includes details of about forty studies, presented over the past two decades, devoted to (semi)automatic detection or/and classification of different liver pathologies. Quoted systems are divided into three categories: (i) based on a single-image texture of non-enhanced CT images of the liver, (ii) based on a single-image texture of contrast-enhanced images, and (iii) based on a multiimage texture. The latter ones concern a simultaneous analysis of sets of textures, each of which corresponds to the same liver slice, but is related to a different contrast agent concentration in hepatic vessels.
    Analiza tekstur jest szeroko stosowana w wielu cyfrowych systemach wspomagania decyzji medycznych, na podstawie danych obrazowych. Pozwala ona wydobyć z obrazu istotne szczegóły, których nie można dostrzec podczas analizy wizualnej. Pierwsze próby analizy tekstur miały miejsce w latach siedemdziesiątych ubiegłego wieku. Od tamtej pory zaproponowano wiele metod analizy tekstur. Trudno jest jednak wskazać metodę uniwersalna, która zapewniłaby zadowalające wyniki dla każdego problemu diagnostycznego. Niniejsza praca stanowi przegląd metod analizy tekstur, stosowanych do opisu tkanki wątrobowej na obrazach tomografii komputerowej. Przedstawia informacje o około czterdziestu systemach diagnostycznych, zaproponowanych w ciągu ostatnich dwóch dekad, poświęconych (pół)automatycznemu wykrywaniu lub / i klasyfikacji schorzeń wątroby. Opisywane systemy zostały podzielone na trzy kategorie: (i) opierające się na teksturze pojedynczego obrazu, pozyskanego bez podawania pacjentowi środka kontrastującego, (ii) opierające się ´na teksturze pojedynczego obrazu, pozyskanego po podaniu pacjentowi środka kontrastującego, oraz (iii) opierające się na jednoczesnej analizie wielu tekstur. Te ostatnie odnoszą się do analizy zestawów tekstur przedstawiających ten sam wycinek wątroby, lecz odpowiadających różnym stężeniom środka kontrastowego w jej naczyniach krwionośnych.
    Źródło:
    Advances in Computer Science Research; 2014, 11; 85-108
    2300-715X
    Pojawia się w:
    Advances in Computer Science Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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