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Tytuł:
Simulation of computed tomography (CT) images using a Monte Carlo approach
Autorzy:
Wysocka-Rabin, A. M.
Qamhiyeh, S.
Jäkel, O.
Powiązania:
https://bibliotekanauki.pl/articles/147601.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
X-ray tomography
Monte Carlo (MC) method
treatment planning
hadrontherapy
Opis:
Heavy ion treatment planning uses an empirical scanner-dependent calibration relation between computed tomography (CT) numbers and ion range. Any deviation in the values of CT numbers will cause a drift in the calibration curve of the CT scanner, which can reduce the accuracy of treatment beam delivery. To reduce uncertainty in the empirical estimation of CT numbers, we developed a simulation that takes into consideration the geometry, composition, and physical process that underlie their measurement. This approach uses Monte Carlo (MC) simulations, followed by a simple filtered back-projection reconstruction. The MC code used is BEAMnrc/EGSnrc. With the manufacturer’s permission, we simulated the components (X-ray tube, associated filters and beam shapers) of a Siemens Emotion CT. We then generated an initial beam shape and spectra, and performed further simulations using the phantom with substitutes. We analyzed the resulting phase space file to calculate projections, taking into account the energy response of the CT detectors. Then, we applied a simple reconstruction algorithm to the calculated projections in order to receive the CT image.
Źródło:
Nukleonika; 2011, 56, 4; 299-304
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic value of computed tomography (CT) angiography in patients with acute pulmonary embolism
Autorzy:
Zamecka, M.O.
Kurys-Denis, E.
Krupski, W.
Powiązania:
https://bibliotekanauki.pl/articles/3081.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2009, 03, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional reconstruction and morphometric analysis of the mandible in Van cats: A computed tomography (CT) study
Autorzy:
Yilmaz, O.
Demircioglu, İ.
Powiązania:
https://bibliotekanauki.pl/articles/2087193.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computed tomography
mandible
morphometry
three-dimensional reconstruction
Van cat
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 2; 261-270
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The rate of decohesion of a gas turbine blade as assessed with the X-ray computed tomography (CT)
Autorzy:
Chalimoniuk, M.
Szczepanik, R
Błachnio, J.
Powiązania:
https://bibliotekanauki.pl/articles/242103.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gas turbine
blade
maintenance status
diagnosing
X-Ray computer tomography (CT)
composite materials
Opis:
The overheating of the material is among major reasons for failures/damages to gas turbine blades throughout the entire process of operating aircraft turbine engines. The essential method of diagnosing condition of the blades is metallographic examination being however a destructive technique. The paper has been intended to discuss one of non-destructive testing (NDT) methods, i.e. the X-ray computed tomography (CT), and capabilities of applying it to diagnose changes in condition of gas turbine blades. ‘Tomography’ is a comprehensive term to define a set of diagnostic techniques to produce three-dimensional images that present cross-sections through detail items under scrutiny. The CT is a transmission diagnostic technique that allows layered models (images) of details to be acquired. Most commonly, it is used in research laboratories and throughout the process of the product quality inspection. The paper delivers findings of the preliminary investigation into the assessment of health/maintenance status of gas turbine blades by means of the X-ray computed tomography. The results gained have been successfully verified using the metallographic examination techniques. It has been found that the radiographic imaging method enables recognition of types, sizes, and locations of internal faults in the blades while generating three-dimensional images thereof. Presented are capabilities of the high-resolution X-ray inspection machine with computed tomography (CT), V/tome/x, furnished with a 300 kV tube, and the CT data processing capabilities of the VG Studio Max software solution, high-performance CT reconstruction included (using an optional module). At the same time work is under way with the X-ray tube for nanotomography with the 0.5 m resolution to examine, in particular, modern composite materials.
Źródło:
Journal of KONES; 2013, 20, 3; 89-96
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
Progress in Digital Industrial Radiology. Pt. 2, Computed tomography (CT)
Postępy w cyfrowej radiografii przemysłowej. Cz. 2, Tomografia komputerowa
Autorzy:
Ewert, U.
Fuchs, T.
Powiązania:
https://bibliotekanauki.pl/articles/107921.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
digital radiography
computed tomography
laminography
CFRP
aerospace
automotive
radiografia cyfrowa
tomografia komputerowa
laminografia
kompozyty węglowe
przemysł lotniczy
przemysł motoryzacyjny
Opis:
Part 1: Film Replacement and Backscatter Imaging. The related paper was published in Vol 1-2/2016 of this journal. Part 2: Computed tomography (CT). Applications cover the range from nano-meter to meter scale. New specialized high energy CT devices have been laid out for inspection of large building structures or complete cars before and after crash tests. The scope of typical CT applications changes from flaw detection to dimensional measurement in industry substituting coordinate measurement machines. First applications of at line or in line inspection in production lines of car industry are discussed. CT is applied for a variety of applications, where selected areas as e.g. plant and food research in outlined. Mobile computed tomography is applied for in-service radiographic crack detection and sizing of welded pipes in nuclear power plants and for NDT of large CFRP structures of airplanes. Part 3: Micro Radiography and Micro CT. To be published in this journal.
Podobnie jak w przypadku zakończonego sukcesem wdrożenia fotografii cyfrowej, bardzo istotne zmiany można zaobserwować także w cyfrowej radiologii przemysłowej. Niniejsza praca jest podzielona na 3 części: Część 1: Następca błony radiograficznej i obrazowanie za pomocą rozproszenia wstecznego – publikacja ukazała się w wydaniu Nr1-2/2016 tego czasopisma. Część 2: Tomografia komputerowa (CT). Zastosowania tomografii obejmują obiekty o wielkości od nanometrów do metrów. Nowe dedykowane urządzenia wysokoenergetycznej tomografii komputerowej skonstruowano w celu inspekcji dużych konstrukcji budowlanych czy też całych samochodów przed i po testach zderzeniowych. Cel typowego zastosowania tomografii komputerowej uległ zmianie z detekcji wad na wymiarowanie wyrobów przemysłowych, co spowodowało zastąpienie współrzędnościowych maszyn pomiarowych. W pierwszej kolejności omówiono zastosowanie tomografii komputerowej na liniach produkcyjnych w przemyśle samochodowym. Tomografia komputerowa ma wiele zastosowań, w tym np. badanie roślin i żywności. Przenośne tomografy komputerowe wykorzystywane są do wykrywania defektów i wymiarowania spawanych rur w elektrowniach jądrowych, a także do inspekcji dużych elementów konstrukcji lotniczych wykonanych z kompozytów węglowych. Część 3: Mikroradiografia i mikrotomografia komputerowa.
Źródło:
Badania Nieniszczące i Diagnostyka; 2017, 1-2; 7-14
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Assessing the representative elementary volume of rock types by X-ray computed tomography (CT) – a simple approach to demonstrate the heterogeneity of the Boda Claystone Formation in Hungary
Autorzy:
Abutaha, Saja M.
Geiger, János
Gulyás, Sándor
Fedor, Ferenc
Powiązania:
https://bibliotekanauki.pl/articles/2204358.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Hounsfield Unit
HU
autoregressive integrated moving average
ARIMA
Statistical Process Control
SPC technique
skala Hounsfielda
model ARIMA
statystyczna kontrola procesu
SPC
Opis:
X-ray computed tomography (CT) can reveal internal, three-dimensional details of objects in a non-destructive way and provide high-resolution, quantitative data in the form of CT numbers. The sensitivity of the CT number to changes in material density means that it may be used to identify lithology changes within cores of sedimentary rocks. The present pilot study confirms the use of Representative Elementary Volume (REV) to quantify inhomogeneity of CT densities of rock constituents of the Boda Claystone Formation. Thirty-two layers, 2 m core length, of this formation were studied. Based on the dominant rock-forming constituent, two rock types could be defined, i.e., clayey siltstone (20 layers) and fine siltstone (12 layers). Eleven of these layers (clayey siltstone and fine siltstone) showed sedimentary features such as, convolute laminations, desiccation cracks, cross-laminations and cracks. The application of the Autoregressive Integrated Moving Averages, Statistical Process Control (ARIMA SPC) method to define Representative Elementary Volume (REV) of CT densities (Hounsfield unit values) affirmed the following results: i) the highest REV values corresponded to the presence of sedimentary structures or high ratios of siltstone constituents (> 60%). ii) the REV average of the clayey siltstone was (5.86 cm3) and (6.54 cm3) of the fine siltstone. iii) normalised REV percentages of the clayey siltstone and fine siltstone, on the scale of the core volume studied were 19.88% and 22.84%; respectively. iv) whenever the corresponding layer did not reveal any sedimentary structure, the normalised REV values would be below 10%. The internal void space in layers with sedimentary features might explain the marked textural heterogeneity and elevated REV values. The drying process of the core sample might also have played a significant role in increasing erroneous pore proportions by volume reducation of clay minerals, particularly within sedimentary structures, where authigenic clay and carbonate cement were presumed to be dominant.
Źródło:
Geologos; 2021, 27, 3; 157--172
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected features of carbonate rocks based on the X-ray computed tomography method (CT)
Wybrane cechy skał węglanowych w odwzorowaniu rentgenowskiej tomografii komputerowej (CT)
Autorzy:
Urbaniec, A.
Drabik, K.
Dohnalik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1835191.pdf
Data publikacji:
2018
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
X-ray computed tomography
carbonate rocks
texture features
biogenic structures
porosity
fractures
rentgenowska tomografia komputerowa
skały węglanowe
cechy teksturalne
struktury biogeniczne
porowatość
szczeliny
Opis:
The paper presents possibilities of X-ray computed tomography (CT) application in view of representing selected features of carbonate rocks in a CT image. 72 sections of drill cores, approx. 1 m long each, were selected for tomographic examinations to obtain as reliable as possible results. The selected core material represents carbonate formations of various ages (from Palaeozoic to Upper Cretaceous), originating from boreholes situated in the Carpathian Foreland area. The interpretation of tomographic examinations was connected with a detailed sedimentological analysis of selected core sections, allowing to carry out direct comparisons, which of studied features and to what extent have disclosed in the CT images, and also whether this image can supplement or make the prepared descriptions more detailed. The presented information has a qualitative nature, i.e. referring mainly to descriptive features of the analysed carbonate rocks. Because of a limited size of the paper we have focused only on a few from numerous analysed features of carbonate rocks. The method of X-ray computed tomography (CT) can be very helpful at the analysis of various carbonate rocks features, such as structural and textural features, biogenic structures, porosity, and fracturing. It should be emphasised that this is a non-invasive method, providing a possibility to reproduce the CT image in various directions, without the necessity of mechanical interference in the rock material, resulting in the core destruction. Mummified siliceous sponges were examples of biogenic structures, which were best reflected in formations, which have been subjected to processes of selective dolomitization. In such type of carbonate rocks the sponge mummies were not dolomitized, while the basic material of the background was dolomitized. A very good representation of the structure in CT images was obtained for colonial hexacorals from the Scleractinia group, because many details of their skeleton structure are noticeable. Contrary to siliceous sponges the structure of corals is preserved much worse in the case, when the studied deposits were subject to diagenetic processes (such as dissolution, recrystallisation, or dolomitization). In addition, the analysis of various bioclasts, preserved in carbonate rocks, has shown a significant role both of the original mineral component building the skeletal elements of organisms (aragonite, high-magnesium calcite, lowmagnesium calcite), and of diagenetic processes history, directly affecting the condition of those components preservation. Based on the analysed materials it was found that porosity and fracturing are among best reflected features of carbonate rocks in the CT image. Open fractures, fractures filled with anhydrite and fractures filled with clay-marly material are generally well reflected in the CT image. Instead, fractures filled with calcite are variously recognisable, depending on the mineral composition of the rock background.
W artykule przedstawiono możliwości wykorzystania rentgenowskiej tomografii komputerowej (CT) pod kątem odzwierciedlenia wybranych cech skał węglanowych w obrazie CT. Do badań tomograficznych wytypowano 72 odcinki rdzeni wiertniczych o długości ok. 1 m każdy w celu uzyskania możliwie najbardziej wiarygodnych wyników. Wytypowany materiał rdzeniowy reprezentuje utwory węglanowe różnego wieku (od paleozoiku po górną kredę), pochodzące z otworów wiertniczych, zlokalizowanych na obszarze przedgórza i w podłożu Karpat. Interpretację badań tomograficznych powiązano ze szczegółową analizą sedymentologiczną wybranych odcinków rdzeni, co pozwoliło na bezpośrednie porównanie, które z badanych cech i w jakim stopniu ujawniły się w obrazie tomograficznym, a także czy obraz ten jest w stanie uzupełnić lub uszczegółowić wykonane opisy. Przedstawione informacje mają charakter jakościowy, tj. odnoszący się głównie do cech opisowych analizowanych skał węglanowych. W związku z ograniczoną objętością artykułu skoncentrowano się jedynie na kilku spośród wielu przeanalizowanych cech skał węglanowych. Metoda rentgenowskiej tomografii komputerowej (CT) może być bardzo pomocna przy analizie różnego typu ich cech, takich jak: cechy strukturalne i teksturalne, struktury biogeniczne, porowatość, szczelinowatość. Należy podkreślić, że jest to metoda nieinwazyjna, dająca możliwość odtwarzania obrazu tomograficznego w różnych kierunkach, bez konieczności mechanicznej ingerencji w materiał skalny, prowadzącej do niszczenia rdzenia. Spośród przeanalizowanych struktur biogenicznych uwagę zwrócono na zmumifikowane gąbki krzemionkowe, które w najlepszym stopniu odwzorowane zostały w zapisie CT w utworach, które w trakcie diagenezy poddane zostały procesom selektywnej dolomityzacji. W tego typu utworach mumie gąbek nie uległy dolomityzacji, podczas gdy masa podstawowa otaczającego osadu została zdolomityzowana. Bardzo dobre odzwierciedlenie struktury w zapisie CT uzyskano dla kolonijnych koralowców sześciopromiennych z grupy Scleractinia, gdyż w obrazie tomograficznym dostrzegalnych jest wiele detali budowy ich szkieletu. W przeciwieństwie do gąbek krzemionkowych, struktura koralowców zachowana jest znacznie gorzej w przypadku, gdy badane utwory poddane zostały w większym stopniu procesom diagenetycznym (takim jak rozpuszczanie, rekrystalizacja czy też dolomityzacja). Ponadto analiza różnego typu bioklastów, zachowanych w skałach węglanowych, wykazała istotną rolę, zarówno pierwotnego składnika mineralnego budującego elementy szkieletowe organizmów (aragonit, kalcyt wysokomagnezowy, kalcyt niskomagnezowy), jak również historii procesów diagenetycznych, mających bezpośredni wpływ na stan zachowania tych elementów. Na podstawie przeanalizowanych materiałów stwierdzono, że porowatość i szczelinowatość są jednymi z najlepiej odwzorowanych w zapisie tomograficznym cech skał węglanowych. W obrazie CT na ogół w bardzo dobrym stopniu czytelne są szczeliny otwarte, szczeliny wypełnione anhydrytem oraz szczeliny wypełnione materiałem ilasto-marglistym. Natomiast szczeliny zabliźnione kalcytem rozpoznawalne są w różnym stopniu, w zależności od składu mineralnego tła skalnego.
Źródło:
Nafta-Gaz; 2018, 74, 3; 183-192
0867-8871
Pojawia się w:
Nafta-Gaz
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:
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:
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:
The prevalence of incidental findings in computed tomography of the head in Pediatric Emergency Department
Autorzy:
Lipińska, Justyna
Lipiński, Łukasz
Kopeć, Izabela
Kowalczuk, Maria
Woźniak, Magdalena Maria
Powiązania:
https://bibliotekanauki.pl/articles/40555844.pdf
Data publikacji:
2024-06-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
head CT incidental findings
pediatric ED
pediatric head CT
Opis:
Introduction and aim. Computed tomography (CT) is the first imaging modality in the evaluation of children in case of patients with head injury in pediatric Emergency Departments (EDs). Radiological CT reports include not only lesions that are the main cause of the child’s complaints but also incidental findings. The objective of this study is to assess incidental findings observed in children who were admitted to the ED and had the head CT performed. Material and methods. This retrospective, cross-sectional study enrolled 644 children under the age of 18, from 1st January 2021 to 31st June 2021. Each child could have had one or more incidental findings in CT. Results. Among all CT studies, incidental findings were found in 279 out of 644 (43.32%) cases, of which 73 (11.34%) had both lesions detected incidentally and related to the trauma. Conclusion. Head CT is an incredibly useful tool in the assessment of some head emergencies. However, evaluation of the prevalence of incidental findings is difficult. Most of them require no specific further investigation. Pediatricians, who order CTs in children, must be prepared to interpret and communicate findings to families and introduce treatment in necessary situations.
Źródło:
European Journal of Clinical and Experimental Medicine; 2024, 22, 2; 275-278
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
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
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