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    Wyświetlanie 1-11 z 11
    Tytuł:
    An analysis of the auxetic cranioplasty implant
    Autorzy:
    Maciejewska, Jagoda
    Jopek, Hubert
    Powiązania:
    https://bibliotekanauki.pl/articles/2146601.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    auxetic structures
    cranioplasty
    skull implant
    finite elements method
    struktury auksetyczne
    kranioplastyka
    implant czaszkowy
    metoda elementów skończonych
    Opis:
    The following paper is a reflection on the advisability of using auxetic structures in medical devices. For this purpose, a model of a skull implant was designed. This implant could be used for cranioplasty of bone defects after neurosurgical procedures. The implant is made of a titanium alloy and has an auxetic "double arrow" structure. The behavior of the implant was investigated in two cases, under the influence of increased intracranial pressure and impact of an external force. The calculations were made with the finite element method implemented in the SolidWorks 2020 program. Moreover, the natural frequency of the structure was examined in the Comsol Multiphysics program.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020315
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza antropologiczna szczątków ludzkich z grobów szkieletowych na cmentarzysku kultury oksywskiej i wielbarskiej w Drawsku Pomorskim
    Anthropological analysis of human remains from inhumation graves excavated at the cemetery of the Oksywie and Wielbark culture at Drawsko Pomorskie
    Autorzy:
    Dzierlińska, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/440455.pdf
    Data publikacji:
    2019-12-23
    Wydawca:
    Muzeum Narodowe w Szczecinie
    Tematy:
    kultura oksywska
    szczątki ludzkie
    stan zachowania kości
    analiza bioarcheologiczna
    antropologia
    analiza czaszek
    Oksywie culture
    human remains
    degree of preservation
    bioarchaeological analysis
    anthropology
    skull analysis
    Opis:
    Analysed skeletal remains (eight skulls) come from six inhumations of the Oksywie culture, recorded during archaeological excavations on the Roman period cemetery at Drawsko Pomorskie, Drawsko Pomorskie district at the beginning of the 20th century. The aim of the analysis was to describe a state of preservation and biological characteristics of the buried people.
    Źródło:
    Materiały Zachodniopomorskie; 2019, 15; 239-248
    0076-5236
    Pojawia się w:
    Materiały Zachodniopomorskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza statystyczna pomiarów morfologicznych czaszek u niemowląt
    Statistical analysis of morphological measurements in infants’ skull
    Autorzy:
    Otrębska, M.
    Gzik, M.
    Wolański, W.
    Kawlewska, E.
    Janoska, P.
    Mandera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/99233.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    kraniosynostoza
    czaszka
    pomiar morfologiczny
    craniosynostosis
    skull
    morphological measurement
    Źródło:
    Aktualne Problemy Biomechaniki; 2012, 6; 105-110
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the reliability of clinical examination in predicting traumatic cerebral lesions and skull fractures in patients with mild and moderate head trauma
    Autorzy:
    Żyluk, Andrzej
    Mazur, Agnieszka
    Piotuch, Bernard
    Safranow, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1396507.pdf
    Data publikacji:
    2013-12-01
    Wydawca:
    Index Copernicus International
    Tematy:
    head injury
    head computer tomography
    clinical decision rules
    Opis:
    The aim of the study was to assess the reliability of neurological examination and other factors in predicting traumatic cerebral lesions and skull fractures in patients with mild and moderate head trauma (GCS 10-15). Material and methods. Over a one-year period, 227 patients: 145 male and 82 female, aged a mean of 51 years who sustained mild or moderate head trauma (GSC 10-15) were examined neurologically and had performed head CT scans. The neurological examination as a whole and each finding of the neurological examination were tested as predictors of the presence of traumatic abnormalities in the head CT scan. Results. Post-traumatic lesions in head CT scan were found in 109 patients (48%): skull fractures in 66 of these and brain injuries in 94; fifty-eight patients had skull fracture combined with brain injury. Seventeen patients required neurosurgical intervention (hematoma evacuation). Abnormal neurological examination showed the highest reliability in identifying patients with brain injuries in CT (sensitivity 87%, specificity 79%). Of single findings, gait abnormalities and consciousness disturbances, present in sober patients, were the strongest predictors of cerebral lesions. Likewise, abnormal neurological examination was the best indicator of skull fractures (sensitivity 77%, specificity 63%). Gait abnormalities and “racoon eyes” present in alcohol intoxicated patients were the strongest individual predictors of skull fractures. Conclusion. Results of our study show neurological abnormalities as the most reliable (although not 100% accurate) in identifying patients who are likely to have brain injuries and/or skull fracture following head trauma. Use of clinical decision rules may reduce the number of head CT scans performed “just in a case”.
    Źródło:
    Polish Journal of Surgery; 2013, 85, 12; 699-705
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of convolutional neural networks with anatomical knowledge for brain MRI analysis in MS patients
    Autorzy:
    Stasiak, B.
    Tarasiuk, P.
    Michalska, I.
    Tomczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200542.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple sclerosis
    convolutional neural networks
    skull stripping
    ventricular system
    stwardnienie rozsiane
    splotowe sieci neuronowe
    system komorowy
    Opis:
    In this paper we consider the problem of automatic localization of multiple sclerosis (MS) lesions within brain tissue. We use a machine learning approach based on a convolutional neural network (CNN) which is trained to recognize the lesions in magnetic resonance images (MRI scans) of the patient’s brain. The training images are relatively small fragments clipped from the MRI scans so – in order to provide additional hints on location of a given clip within the brain structures – we include anatomical information in the training/testing process. Our research has shown that indicating the location of the ventricles and other structures, as well as performing brain tissue classification may enhance the results of the automatic localization of the MS-related demyelinating plaques in the MRI scans.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 6; 857-868
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative accuracy analysis of triangulated surface models of a fossil skull digitized with various optic devices
    Autorzy:
    Garashchenko, Yaroslav
    Kogan, Ilja
    Rucki, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2052109.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Madygenerpeton
    optical measurement
    triangulated model
    polygonal analysis
    accuracy
    Opis:
    Digital metrology was applied for evaluate 3D models of the unique skull of a fossil tetrapod, Madygenerpeton pustulatum, generated using various 3D digitization methods. The skull surface is covered by minute tubercles making it challenging for digitization with appropriate accuracy. Uniqueness and fragility of the specimen preclude the use of tactile measuring systems for creating a standardized reference model. To overcome this problem, comparative analysis of the triangulated models generated from the clouds of points obtained with seven different devices was conducted using the Geomagic Studio and Autodesk PowerShape CAD software. In the proposed approach, geometrically and dimensionally closest-fitting models underwent detailed statistical analysis between surface polygons in three steps. First, 3D models obtained from different scanning methods were compared with each other in couples. Next, statistical analysis of the differences between the coupled models was performed. Finally, a rating list of the models related to the required accuracy was prepared. The proposed approach is applicable to any other scanned object, especially in palaeontological applications, where each object is unique and exhibits individual features.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 1; 37-51
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological analysis of additively manufactured copies of a fossil skull
    Autorzy:
    Rucki, Mirosław
    Garashchenko, Yaroslav
    Kogan, Ilja
    Ryba, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2173724.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    Madygenerpeton
    optical measurement
    statistical analysis
    produkcja dodatkowa
    pomiar optyczny
    analiza statystyczna
    Opis:
    This paper presents the results of a metrological analysis of the additively manufactured (AM) copies of a complex geometrical object, namely the fossil skull of Madygenerpeton pustulatum. This fossil represents the unique remains of an extinct “reptiliomorph amphibian” of high importance for palaeontological science. For this research, the surface was scanned and twelve different copies were 3D-printed using various devices, materials, and AM techniques. The same digitized model was used as a reference to compare with the surfaces obtained by Mitutoyo Coordinate Measuring Machine (CMM) CRYSTA-Apex S 9166 for each copy. The fidelity of the copies was assessed through statistical analysis of the distances between compared surfaces. The methodology provided a good background for the choice of the most accurate copies and the elimination of the less accurate ones. The proposed approach can be applied to any object of complex geometry when reproduction accuracy is to be assessed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143827
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and structural analysis of skull/cranial implant: beyond mid-line deformities
    Autorzy:
    Bogu, V. P.
    Kumar, Y. R.
    Khanara, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307070.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ciśnienie wewnątrzczaszkowe
    FEM
    implant
    intracranial pressure
    finite element analysis
    beyond mid-line defect
    fixation points
    Opis:
    Purpose: This computational study explores modelling and finite element study of the implant under Intracranial pressure (ICP) conditions with normal ICP range (7 mm Hg to 15 mm Hg) or increased ICP (>I5 mm Hg). The implant fixation points allow implant behaviour with respect to intracranial pressure conditions. However, increased fixation points lead to variation in deformation and equivalent stress. Finite element analysis is providing a valuable insight to know the deformation and equivalent stress. Methods: The patient CT data (Computed Tomography) is processed in Mimics software to get the mesh model. The implant is modelled by using modified reverse engineering technique with the help of Rhinoceros software. This modelling method is applicable for all types of defects including those beyond the middle line and multiple ones. It is designed with eight fixation points and ten fixation points to fix an implant. Consequently, the mechanical deformation and equivalent stress (von Mises) are calculated in ANSYS 15 software with distinctive material properties such as Titanium alloy (Ti6Al4V), Polymethyl methacrylate (PMMA) and polyether-ether-ketone (PEEK). Results: The deformation and equivalent stress results are obtained through ANSYS 15 software. It is observed that Ti6Al4V material shows low deformation and PEEK material shows less equivalent stress. Among all materials PEEK shows noticeably good result. Conclusions: Hence, a concept was established and more clinically relevant results can be expected with implementation of realistic 3D printed model in the future. This will allow physicians to gain knowledge and decrease surgery time with proper planning.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 125-131
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rejestracja ruchu żuchwy względem podstawy czaszki
    Registration of the movement of the mandible relative to the base of the skull
    Autorzy:
    Bukała, Jakub
    Małachowski, Jerzy
    Pietroń, Kamil
    Sybilski, Kamil
    Szafrańska, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/2201486.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    żuchwa
    analiza ruchu
    druk 3D
    mandible
    motion analysis
    3D printing
    Opis:
    W pracy przedstawiono metodę badawczą pozwalającą na wyznaczenie krzywych opisujących ruch żuchwy względem podstawy czaszki człowieka bazującą na wideo-analizie. Do pomiaru wykorzystuje się markery pasywne odbijające promieniowanie podczerwone, które umieszczane są na nakładkach mocowanych do tkanek twardych osoby badanej.
    The study presents a research method for determining movement curves of the human mandible in relation to the base of the skull. The method is based on video analysis of passive markers reflecting IR radiation. Markers are placed on the personalized overlays fastened to the hard tissues of the examined person.
    Źródło:
    Aktualne Problemy Biomechaniki; 2019, 17; 11--17
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skull structure and evolution in tyrannosaurid dinosaurs
    Autorzy:
    Currie, P J
    Hurum, J.H.
    Sabath, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/22810.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    parsimonious analysis
    phylogenesis
    Coelurosauria
    Tyrannosauridae
    Theropoda
    Dinosauria
    skull structure
    evolution
    dinosaur
    paleontology
    tyrannosaurid dinosaur
    Opis:
    Tyrannosauridae can be subdivided into two distinct subfamilies—the Albertosaurinae and the Tyrannosaurinae. Previously recognized subdivisions Aublysodontinae and Shanshanosaurinae are rejected because they are based on insufficient material and juvenile specimens. Our results are based upon a phylogenetic analysis using PAUP program (Swofford 1999) of 77 skull characters and seven genera (Albertosaurus, Alioramus, Daspletosaurus, Gorgosaurus, Nanotyrannus, Tarbosaurus, and Tyrannosaurus); with Allosaurus as outgroup. Of the 77 characters used, more than half were parsimony informative. Asingle most parsimonious tree was obtained with the Tree Length being 88. The analysis of cranial characters and comparison of postcranial features reveal that Tarbosaurus bataar is not the sister taxon of Tyrannosaurus rex (contra Holtz 2001). Their similarities are partially due to the fact that both are extremely large animals. Thus, Tarbosaurus should be considered a genus distinct from Tyrannosaurus.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Śmierć Sergiusza Jesienina – samobójstwo czy zabójstwo upozorowane na samobójstwo? Analiza wybranych okoliczności zgonu i obrażeń ciała
    Sergei Yesenin’s death – a suicide or a murder staged to look like a suicide? An analysis of some selected circumstances of the death and injuries
    Autorzy:
    Arkuszewski, Piotr
    Antoszczyk, Łukasz
    Mazurek-Wardak, Magdalena
    Wardak, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/686080.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    Sergiusz Jesienin
    upozorowanie zabójstwa na samobójstwo
    powieszenie
    zadzierzgnięcie
    włamanie kości czaszki
    Sergei Yesenin
    staging a murder to look like a suicide
    hanging
    strangulation
    skull bone infarction
    Opis:
    The article contains some consideration about selected, crucial circumstances of the death of the Russian poet Sergei Yesenin and it also concerns the injuries found in him during the post-mortem examination. The authors have focused on the most important and currently available information which indicates that the true cause of the poet’s death might have been different from the official cause of death. Some facts discredit suicidal hanging and the others suggest a possibility of a murder staged to look like a suicide.
    Artykuł zawiera rozważania dotyczące wybranych, kluczowych okoliczności śmierci rosyjskiego poety Sergiusza Jesienina oraz stwierdzonych u niego po śmierci obrażeń ciała. Autorzy skupili się na najważniejszych dostępnych dziś informacjach, które wskazują, że faktyczna przyczyna zgonu poety mogła być inna niż oficjalna. Pewne fakty podają bowiem w wątpliwość samobójcze zawiśnięcie w pętli, a inne z kolei sugerują możliwość dokonania zabójstwa z upozorowaniem go na samobójstwo.
    Źródło:
    Acta Universitatis Lodziensis. Folia Iuridica; 2018, 83; 21-31
    0208-6069
    2450-2782
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Iuridica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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