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    Wyświetlanie 1-11 z 11
    Tytuł:
    An adaptive stochastic optimization method for medical registration problem
    Autorzy:
    Król, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/333559.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    registration
    matching
    optimization
    simulated annealing
    similarity measure
    non-deterministic methods
    cooling schedule
    tomographic data
    rejestracja
    optymalizacja
    wyżarzanie
    miara podobieństwa
    metody niedeterministyczne
    chłodzenie
    dane tomograficzne
    Opis:
    This paper presents a methodology that addresses important issues concerned with the optimization of the misregistration measures in the volumetric medical data registration problem. Our registration framework uses robust simulated annealing method to handle multiple local minima of the cost function. Our efforts have been centred on obtaining a reliable, efficient and generally applicable method to solve such optimization problems. This has been accomplished through developing an adaptive cooling schedule for the simulated annealing method. The proposed method is very reliable for the estimation of the global minimum in the optimization of objective functions with highly differentiated search space landscapes. We present the detailed description of the method as well as discussion of its advantages and disadvantages.
    Źródło:
    Journal of Medical Informatics & Technologies; 2004, 7; MIP79-88
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automatic alignment of intramodal tomographic data using s-distance approach
    Autorzy:
    Król, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/334027.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    rejestracja
    podobieństwo pomiaru
    topografia obszaru przeszukiwania
    registration
    similarity measure
    s-distance
    cross-metric
    intramodality data
    search space topography
    Opis:
    The alignment of volumetric datasets is an important problem in the processing of medical data. It is a prerequisite to numerous image based applications in diagnostic and therapeutic routines. In this paper, a new method is proposed for matching of 3D intramodality medical images. Our approach is based on some generalization of feature distance definition. Analogous to the standard surface matching, our algorithm uses also the chamfer distance like metric to define the quality of match function, however, the evaluation of the distance map is performed in a different way. The s-distance method is a step towards an automatic extraction of features, where each feature’s role in the registration process is weighted based on its relative statistical or spatial significance. As an alternative to the user-dependent non-automatic registration methods this approach offers a good assessment of similarity in the intramodality case. The elimination of less significant features in the registration process has resulted in a greatly improved efficiency over the voxel-based methods. Studying certain properties of the search space topography provides some insights into the performance of the proposed method as well as the standard registration algorithms in the rigid body registration problem.
    Źródło:
    Journal of Medical Informatics & Technologies; 2003, 6; IT3-11
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Registration approaches for the optimisation of medical diagnostics and treatment
    Autorzy:
    Chlebiej, M.
    Król, Z.
    Mikołajczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/333859.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    rejestracja
    planowanie operacji
    diagnostyka wspomagana komputerowo
    elastyczna rejestracja
    skaner laserowy
    registration
    surgery planning
    graft design
    computer-aided diagnostics
    elastic registration
    laser scanner
    surface data quality improvement
    Opis:
    Many medical diagnostics and treatment procedures in the oncology, cranio-maxillofacial surgery, radiotherapy and neurosurgery deal with volumetric as well as surface data. Tumor detection or generation of the virtual treatment scene involves using complementary data sets that are obtained from different sensors, for example MR and CT data, or by the same sensor at different epochs. The very need for registration arises from the fact that the complementary data sets are acquired by imaging devices using different spatial coordinate systems or/and the anatomically correct superposition of two data instances cannot be performed without locally applied elastic transformation. The volume or surface matching is therefore an essential task in these applications. From the mathematical point of view the data aligning problem is an optimization task, which can be solved by using deterministic or non-deterministic optimization algorithms. Depending on the data size and the complexity of required matching transformation the runtime behaviour of the registration methods can stretch out between real-time and many hours' computations. In this paper various applications of the same registration paradigm are presented and discussed. The wide spectrum of the medical applications shows the importance of the registration approach for the optimization of medical diagnostics and treatment.
    Źródło:
    Journal of Medical Informatics & Technologies; 2005, 9; 57-64
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical treatment of registration problem in generation of patient-specific anatomical models
    Autorzy:
    Chlebiej, M.
    Król, Z.
    Mikołajczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/334013.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    rejestracja
    metody optymalizacji
    wizualizacja
    wirtualne fantomy specyficzne dla pacjentów
    registration
    optimization methods
    visualization
    virtual patient-specific anatomical models
    Visible Human Project dataset
    Opis:
    Registration is an important component of many medical data processing applications. Particularly significant is its role in the correlation of volumetric medical data aiming at generation of virtual patient-specific anatomical models. Such models enable optimization of various diagnostic and therapeutical procedures. The importance of the virtual patient models is becoming increasingly recognized in modern medicine. The advantages of using such biomedical virtual models are analogous to the advantages of real system behavior simulation in the engineering or material sciences. In this work some numerical issues associated with the registration problem and the visualization challenges arising in the context of virtual anatomical models have been presented and discussed.
    Źródło:
    Journal of Medical Informatics & Technologies; 2003, 6; IT13-20
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwość ograniczania wzrostu grzybów patogenicznych dla leszczyny przez bakterie antagonistyczne
    Autorzy:
    Król, Z.
    Machowicz-Stefaniak, Z.
    Zalewska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/11347122.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    Botrytis cinerea
    Cytospora corylicola
    Gleosporium coryli
    Phomopsis
    bakterie antagonistyczne
    drzewa owocowe
    grzyby patogeniczne
    leszczyna
    Gloeosporium coryli
    hazel
    antagonistic bacteria
    fruit tree
    pathogenic fungi
    Opis:
    Spośród 138 badanych izolatów bakterii epifitycznych pochodzących z liści leszczyny, 12 izolatów ograniczało in vitro wzrost kolonii Botrytis cinerea, 33 ograniczało wzrost Cytospora corylicola, 31 hamowało wzrost Gloeosporium coryli, a 36 wykazywało antagonistyczne oddziaływanie w stosunku do Phomopsis sp. Stwierdzono, że tylko 9 izolatów ograniczało wzrost kolonii wszystkich wymienionych patogenów, a 7 izolatów ograniczało wzrost przynajmniej 3 gatunków grzybów patogenicznych. Zdolność badanych izolatów bakterii do ograniczania wzrostu patogenów była większa po 4 dniach biotycznego oddziaływania, a po 8 dniach znacznie się zmniejszyła. Najefektywniejsze w ograniczaniu izolaty bakterii należały do rodzajów Pseudomonas fluorescens, Pseudomonas spp., Bacillus sp., Enterobacter, Citrobacter, Klebsiella lub Erwinia cypripedii.
    Amangst 138 epiphytic bacterial isolates originating from hazel leaves 12 isolates limited the growth of B. cinerea, 33 limited the growth of C. corylicola, 31 inhibited the growth of G. coryli and 36 isolates showed antagonistic activity against Phomopsis sp. in-vitro. It was found that 9 isolates limited the growth of all the pathogenes tested and 7 isolates inhibited the growth of at least 3 out of them. The abilities of bacterial isolates tested to limit of the pathgenes growth were higher after 4 days of the biotic influence than after 8 days. Isolates of bacteria with the highest inhibitory activity against the above – mentioned pathogenes were identified as Pseudomonas fluorescens, Pseudomonas sp., Bacillus sp. and Enterobacter, Citobacter, Klebsiella or Erwinia cypripedii.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2003, 02, 2; 51-57
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Visible Human Projects - a step towards the virtual patient: models and simulations
    Autorzy:
    Król, Z.
    Chlebiej, M.
    Mikołajczak, P.
    Hoffmann, K.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/333562.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    segmentacja
    rejestracja
    modele funkcyjne
    symulacja biomechaniczna
    wirtualne fantomy specyficzne dla pacjentów
    segmentation
    registration
    Visible Human Project
    functional models
    biomechanical simulation
    virtual patient-specific anatomical models
    Opis:
    This paper reports on our experiences using datasets from the Visible Human Project in different biomedical applications. Introduced 1994 by the US National Library of Medicine the digitized multimodal anatomical datasets of the Visible Man have challenged the worldwide scientific community. A significant response to this challenge from several interdisciplinary research teams has emerged as a new area of research. This area requires close interaction and collaboration among anatomists, radiologists, computer scientists, mathematicians, engineers and physicians. The digitized volumetric images of the human body have been applied not only for the computer-aided exploration of the human gross anatomy, but also as structural input for the therapy planning and simulation systems. The importance of such virtual patient model is becoming increasingly recognized in modern medicine. To effectively use these specific datasets a sophisticated framework consisting of image processing, computer graphics and mathematical modelling methods is required. In this work various aspects of the developed framework are presented and discussed. Some preliminary results of our biomedical simulations are presented.
    Źródło:
    Journal of Medical Informatics & Technologies; 2004, 7; MIP51-58
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of X-ray propagation in bone microstructure
    Autorzy:
    Binkowski, M.
    Król, Z.
    Wróbel, Z.
    Zeilhofer, H.-F.
    Powiązania:
    https://bibliotekanauki.pl/articles/333863.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    mikrotomografia
    mikrostruktury kości
    tłumienie promieniowania rentgenowskiego
    wizualizacja
    tomografia komputerowa
    erozja
    microtomography
    X-ray propagation
    bone microstructure
    attenuation of X-ray radiation
    visualization
    computed tomography
    erosion
    Opis:
    This paper presents some results concerning the analysis of X-ray propagation through biological structures. We introduce a physical model of the phenomenon and a numerical method based on this model for simulation of X-ray radiation propagation. The proposed method enables generation of radiological projections like those in the computed tomography or microtomography. We have focused our attention on the attenuation of X-ray radiation in bone tissue. Our computational model enables simulation of radiation propagation in the virtual specimen. The virtual bone microstructures used in our experiments are derived from the microtomography datasets of real bone specimens. The main advantage of our approach is that we can change the microstructure of the virtual sample in many ways by using the image processing methods. Results presented in this paper contain simulations of X-ray propagation for modified and unmodified trabecular microstructures as well as the visualization of the radiation intensity distribution for the simulated cases. With this new simulation technique, it is possible for example to analyze the propagation of X-ray radiation for different pathologic types of bone microstructure (e.g. virtually generated osteoporosis).
    Źródło:
    Journal of Medical Informatics & Technologies; 2005, 9; 75-82
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using of statistical shape models for pelvis reconstruction in the oncologic surgery
    Autorzy:
    Skadłubowicz, P.
    Król, Z.
    Wróbel, Z.
    Hefti, F.
    Krieg, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/333118.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    planowanie chirurgii wspomagane komputerowo
    segmentacja
    rekonstrukcja miednicy
    statystyczne modele kształtu
    nowotwory miednicy
    osteotomia miednicy
    computer-aided surgery planning
    segmentation
    pelvic reconstruction
    statistical shape model
    pelvic tumours
    pelvic osteotomy
    Opis:
    The reconstruction of the osseous structures in the pelvic region after bone tumour resection is highly complex and challenging. Up to now the reconstruction of the pelvis defects by autologous or allogenous grafts (for instance the fibula transplants) are highly unsatisfied because of large shape differences. Therefore there is a huge demand for patient-specific and anatomically shaped implants. Our pelvis reconstruction planning approach is based on the statistical shape model. For generation of the statistical pelvis shape model a large data pool of CT datasets has been collected. The following CT data segmentation and surface processing methods delivered the required pelvis geometries. Via Procrustes analysis of the collected pelvis surfaces the parameterized pelvis shape mean model has been calculated and the principal component analysis (PCA) [3] applied for estimating the anatomically optimal graft or implant geometry. We will demonstrate on the clinical pelvis reconstruction case that the using of statistical shape models in the oncologic surgery planning is robust and very promising method.
    Źródło:
    Journal of Medical Informatics & Technologies; 2009, 13; 151-156
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preoperative planning and intraoperative navigation in the reconstructive craniofacial surgery
    Autorzy:
    Król, Z.
    Chapuis, J.
    Schwenzer-Zimmerer, K.
    Langlotz, F.
    Zeilhofer, H.-F.
    Powiązania:
    https://bibliotekanauki.pl/articles/333866.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    system nawigacji
    chirurgia twarzoczaszki
    repozycjonowanie kości
    planowanie przedoperacyjne
    śledzenie obrazów śródoperacyjnych
    tomografia komputerowa
    kość jarzmowa
    navigation system
    craniofacial surgery
    bone repositioning
    preoperative planning
    intra-operative tracking
    computed tomography
    zygomatic bone
    Opis:
    We present a methodology for navigation-aided surgical treatments in the reconstructive craniofacial surgery. Using the case of zygomatic bone repositioning after gunshot wound trauma the whole preoperative planning process and the intra-operative navigation oriented issues are explicitly described. We have focused our attention on the new navigation oriented aspects and procedures which facilitate and enhance the traditional treatment techniques. Many illustrations let better understand the complex technical dependencies between the main elements of this approach. The presented procedures permit more precise planning and performing of the surgical treatment, reducing intra-operative time and improving the post-operative outcome.
    Źródło:
    Journal of Medical Informatics & Technologies; 2005, 9; 83-89
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Patient-specific graft design method for cranofacial surgical planning
    Autorzy:
    Król, Z.
    Chlebiej, M.
    Zerfass, P.
    Zeilhofer, H.-F.
    Sader, R.
    Mikołajczak, P.
    Keeve, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/332956.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    komputerowe wspomaganie operacji
    planowe przecinanie kości
    przeszczep autologiczny
    projekt transplantacji
    dopasowania środka podobieństwa
    witryna dawcy
    optymalizacja
    computer-aided surgery
    osteotomy planning
    autologous grafts
    transplant design
    matching similarity measure
    donor site
    optimization
    Opis:
    This paper presents a method for computer assisted selection of optimal donor sites for autologous osseous grafts in the craniofacial surgery. At the initial graft design stage the surgeon defines in the CT data set the shape of the bone segment to be reconstructed and in the donor region CT data set a set of constraints for the optimization task. This non-automatic step is followed by a fully automatic optimization stage, which delivers a set of sub-optimal and optimal donor sites for a given template. Such approach permits the surgeon to find the best site for harvesting the graft and enables an exact anatomical reconstruction of the osseous section.
    Źródło:
    Journal of Medical Informatics & Technologies; 2002, 3; MI189-197
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transformation of a large multi-speciality hospital into a dedicated COVID-19 centre during the coronavirus pandemic
    Autorzy:
    Król, Z.
    Szymański, P.
    Bochnia, A.
    Abramowicz, E.
    Płachta, A.
    Rzepliński, R.
    Sługocki, M.
    Nowak, B.
    Zaczyński, A.
    Kozłowski, K.
    Posobkiewicz, M.
    Wierzba, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085728.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    COVID-19
    SARS-CoV-2
    coronavirus pandemic
    treatment in an infectious hospital
    epidemic safety
    organizational changes
    Opis:
    Introduction. The article describes the process of converting a large multi-specialized hospital into one dedicated to COVID-19 patients, and present established standards of work organization in all the wards and training system of the medical and supporting staff. The several weeks pandemic of the COVID-19 disease has forced the healthcare systems of numerous countries to adjust their resources to the care of the growing number of COVID-19 patients. Managers were presented with the challenge of protecting the healthcare workers from transmission of the disease within medical institutions, and issues concerning the physical and psychological depletion of personnel. Materials and method. Based on analyses of the structure and work processes in Central Clinical Hospital (CCH) reconstructive strategic plan was developed. It included: division of existing wards into observation and isolation wards; installing locks; weekly plan for supplying personal protection equipment (PPE); designating new access to the hospital and communication routes; training of medical and supporting staff. The plan was implemented from the first days of conversion of the hospital. Results. The wards of the CCH were converted for observation and isolation, and each one was fitted with sanitary locks. There was a big improvement in the supply of PPE for the medical staff. Separation of the ‘dirty’ and ‘clean’ parts of the CCH were attained, and widespread intensive training not only protected personnel against infections, but also diminished unrest which was discernable at the beginning of conversion. Conclusions. The transformation efforts will ultimately be appraised at the end of the epidemic, but the data looks encouraging. Two weeks after conversion, the testing of hospital Staff was started and by the end of April, 459 tests were had been conducted, of which only 11 were positive.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 2; 201-206
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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