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Wyświetlanie 1-15 z 44
Tytuł:
Absorbed doses for patients undergoing panoramic radiography, cephalometric radiography and CBCT
Autorzy:
Wrzesień, Małgorzata
Olszewski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2161887.pdf
Data publikacji:
2017-07-17
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
thermoluminescence
panoramic radiography
absorbed dose
CBCT
cephalometric radiography
thermoluminescent detectors
Opis:
Objectives Contemporary dental radiology offers a wide spectrum of imaging methods but it also contributes to an increase in the participation of dental radiological diagnosis in the patient’s exposure to ionizing radiation. The aim of this study is to determine the absorbed doses of the brain, spinal column, thyroid and eye lens for patients during panoramic radiography, cephalometric radiography and cone beam computed tomography (CBCT). Material and Methods The thermoluminescent dosimetry and anthropomorphic phantom was used for measuring the doses. The 15 panoramic, 4 cephalometric and 4 CBCT exposures were performed by placing high-sensitivity thermoluminescent detectors (TLD) in 18 anatomical points of the phantom. Results The maximum absorbed dose recorded during performed measurements corresponds to the point representing the brainstem and it is 10 mGy. The dose value recorded by the TLD placed in the thyroid during CBCT imaging in relation to the panoramic radiography differs by a factor of 13.5. Conclusions Cone beam computed tomography, in comparison with panoramic or cephalometric imaging technique, provides higher radiation doses to the patients. Int J Occup Med Environ Health 2017;30(5):705–713
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 5; 705-713
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic neutron radiography studies of drying of kaolin clay cylinders
Autorzy:
Fijał-Kirejczyk, I.
Milczarek, J. J.
Banaszak, J.
Trzciński, A.
Żołądek, J.
Powiązania:
https://bibliotekanauki.pl/articles/148084.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
drying
kaolin
neutron radiography
Opis:
The results of neutron radiography studies on convective drying of kaolin cylinders are presented. The sample shrinkage and loss of water during drying was easily observed on registered neutron radiograms. The saturation of the sample with water was estimated in terms of the neutron effective macroscopic cross-section. The results are comparable to those of gravimetric measurements and are discussed within the framework of simple theories of drying. The effect of the scattered neutrons is discussed in terms of the results of the MC simulations.
Źródło:
Nukleonika; 2009, 54, 2; 123-128
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptomatic radiological changes in computer tomography in children with head trauma
Autorzy:
Marciniak, Aleksandra
Mielnik-Niedzielska, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/1397807.pdf
Data publikacji:
2019
Wydawca:
Index Copernicus International
Tematy:
child
maxillary sinus
radiography
Opis:
Introduction: Computed tomography is an important imaging technique in Emergency Units. Thanks to its popularity, radiological changes are found in healthy children more commonly. The aim of this paper is to evaluate the incidence of maxillary sinus radiological changes in children with head trauma who admitted to the Emergency Unit of the University Children Hospital in Lublin. Material and Methods: A retrospective analysis of computed tomography scans of children suffering from head trauma admitted to the Emergency Unit of the University Children Hospital in Lublin was carried out. A group of 425 patients was analyzed. Results: Maxillary findings were present in 81 cases (19.06%); in 38 patients (8.94%) the changes were unilateral, while in 43 (10.12%) they were bilateral. Maxillary mucosal thickening was the most common radiological abnormality, present in almost 12% of the investigated cases (approximately 62% of all revealed changes). Maxillary total opacification as an isolated finding was found in younger children only. Retention cysts and maxillary polyps were found with a similar low frequency as maxillary opacification but in elder children only. Discussion: Asymptomatic radiological changes in computed tomography scans are common. Maxillary mucosal thickening is the most frequent asymptomatic abnormality. Maxillary polyps and pseudocysts are rare in the paediatric population. Maxillary opacification suggests other more significant pathologies and requires further diagnostics. Physicians should avoid diagnosing patients with sinusitis without proper examination and based on radiological abnormalities only. Paediatric patients with revealed maxillary changes should remain under regular laryngological control.
Źródło:
Polish Journal of Otolaryngology; 2019, 73, 5; 5-11
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detektory promieniowania stosowane w cyfrowej radiografii bezpośredniej
Radiation detectors used in Digital Direct Radiography
Autorzy:
Mackiewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/107842.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
radiografia cyfrowa
panele płaskie
radiografia bezpośrednia DR
digital radiography
flat panel detectors
direct radiography DR
Opis:
W artykule opisano podstawy działania detektorów promieniowania stosowanych w cyfrowej radiografii bezpośredniej - DR. Scharakteryzowano różne rodzaje paneli płaskich pod kątem ich przydatności w obszarze badań nieniszczących. W sposób bardziej szczegółowy omówiono panele płaskie z przemianą pośrednią oparte na matrycy a-Si z tranzystorami TFT, które wykazują obecnie największą przydatność do zastosowań w badaniach nieniszczących. Przeanalizowano najważniejsze parametry paneli płaskich w aspekcie ich zastosowań do badań złączy spawanych oraz innych wyrobów i elementów badanych dotychczas tradycyjną metodą radiograficzną.
The article describes the basics of radiation detectors used in direct digital radiography - DR. Various types of flat panel detectors (FPD) have been characterized for their usefulness in non-destructive testing. The indirect panels based on the a-Si matrix with TFT transistors, which are currently the most useful option for non-destructive testing, are discussed in more detail. The most important parameters of flat panel detectors have been analyzed in the aspect of their applications for the examination of welded joints and other products tested so far by traditional radiographic method.
Źródło:
Badania Nieniszczące i Diagnostyka; 2017, 1-2; 44-51
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A portable fast neutron radiography system for non-destructive analysis of composite materials
Autorzy:
Kam, Erol
Reyhancan, Iskender A.
Biyik, Recep
Powiązania:
https://bibliotekanauki.pl/articles/148503.pdf
Data publikacji:
2019
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
fast neutron
radiography
scintillator
recoil protons
Opis:
Depending on the neutron energy used, neutron radiography can be generally categorized as fast and thermal neutron radiography. Fast neutron radiography (FNR) with neutron energy more than 1 MeV opens up a new range of possibilities for a non-destructive examination when the inspected object is thick or dense. Other traditional techniques, such as X-ray, gamma ray and thermal neutron radiography, do not meet penetration capabilities of FNR in this area. Because of these distinctive features, this technique is used in different industrial applications such as security (cargo investigation for contraband such as narcotics, explosives and illicit drugs), gas/liquid fl ow and mixing and radiography and tomography of encapsulated heavy shielded low Z compound materials. The FNR images are produced directly during exposure as neutrons create recoil protons, which activate a scintillator screen, allowing images to be collected with a computer-controlled charge-coupled device camera. Finally, the picture can be saved on a computer for image processing. The aim of this research was to set up a portable FN R system and to test it for use in non-destructive testing of different composite materials. Experiments were carried out by using a fast portative neutron generator Thermo Scientific MP 320.
Źródło:
Nukleonika; 2019, 64, 3; 97-101
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carpometacarpal subchondral cysts due to repetitive movements in shoemaker: A case report
Autorzy:
Tonini, Stefano
Candura, Stefano M.
Lanfranco, Andrea
Mennoia, N. V.
Powiązania:
https://bibliotekanauki.pl/articles/2185380.pdf
Data publikacji:
2011-12-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
UE-WMSDs
shoe industry
wrist
radiography
Opis:
Objectives: Subchondral carpometacarpal cysts are classic and almost pathognomonic lesions found in workers using vibrating instruments over prolonged periods of time. Materials and Methods: We present the case of a 53-year-old woman who worked for 30 years sewing shoe uppers, a task which required grasping fi rmly a pear-shaped handle awl and pushing it through the leather upper and the sole of the shoe, with combined fl exion and supination movement of the wrist. After approximately 20 years of working, the patient noted gradual onset of paresthesias in the dominant (right) hand, with increasing diffi culty in grasping the awl. Subsequent diagnosis of carpal tunnel syndrome was confi rmed by electrophysiologic testing and its surgical release was performed. Nevertheless, hand pain, paresthesias and weakness persisted. Results: Ultrasound of the snuffbox tendons excluded DeQuervain tenosynovitis. Radiographic imaging of the symptomatic hand showed carpometacarpal subchondral cystic formations. Conclusions: In addition to demonstrating the usefulness of radiographic imaging in patients with persistent hand pain post-carpal release, this case is important in illustrating that repetitive movements with high pressure over the palmar carpal area may cause bone cysts, even if the subjects do not use vibrating tools.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2011, 24, 4; 414-417
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiograficzne i termograwimetryczne badania pirolizy pojedynczej cząstki drewna
Pyrolysis analysis of a single wood particle
Autorzy:
Kaźmierski, P.
Wardach-Święcicka, I.
Tiutiurski, P.
Kardaś, D.
Powiązania:
https://bibliotekanauki.pl/articles/2073378.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
piroliza
radiografia
termograwimetria
pyrolysis
radiography
thermogravimetric analysis
Opis:
Opisano proces pirolizy pojedynczej cząstki drewna. Za pomocą termograwimetrii, badań w piecu wysokotemperaturowym oraz metod radiograficznych przeprowadzono analizę procesu pirolizy. Analizowano szybkość dekompozycji termicznej i jej stopień w funkcji czasu. Badano poddane pojedyncze próbki w formie sosnowych sześcianów o boku 18 mm. Analiza termograwimetryczna mająca na celu wyznaczenie przedziałów, w jakich zachodzi proces, poprzedziła badania wykonane w piecu wysokotemperaturowym. Próbki po eksperymentach zostały poddane badaniom radiograficznym celem zobrazowania zmian gęstości drewna w funkcji czasu. Na zdjęciach zaobserwowano, iż piroliza zachodzi od naroży próbki, a następnie pozostaje tylko niespirolizowany rdzeń w środku próbki. Badania potwierdziły duże możliwości radiografii w ocenie pirolizy.
Pyrolysis process of a single wood particie is described in the paper. Thermogravimetric and radiography techniques and pyrolysis in a high-temperature kiln were applied in the experiments. The thermal decomposition rate as a function of time was analyzed. Pine cubes with a side of 18 mm were used as samples. High-temperature kiln tests were preceded by thermogravimetric analysis aiming to determine temperature ranges in which the process took place. The samples after tests were analyzed using radiographic methods to visualize the changes in wood density as a function of time. It was observed on the photographs that pyrolysis started from sample corners, while only a core in the center of samples remained unchanged. Radiography experiments have a big potential in pyrolysis research.
Źródło:
Inżynieria i Aparatura Chemiczna; 2017, 6; 202--204
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ionising Radiation in Non-destructive Testing, Part 1 Types of Radiation used for Radiographic Testing – Basic Properties and Mechanism of Image Recording
Autorzy:
Ostromęcka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/27311594.pdf
Data publikacji:
2023
Wydawca:
Instytut Kolejnictwa
Tematy:
ionising radiation
non-destructive testing
industrial radiography
Opis:
Electromagnetic radiation, which is a special example of the electromagnetic field, has been present in the universe since its creation. Examples of radiation include radio waves, X-rays, and visible light. Depending on the frequency of the emitted electromagnetic wave, it can be ionising or non-ionising. Ionising radiation, due to its ability to penetrate matter, is often used in many areas of life. In industry, it is used for diagnostic purposes, e.g. in radiography.
Źródło:
Problemy Kolejnictwa; 2023, 198; 141--146
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artefakty w radiografii
Artifacts in radiography
Autorzy:
Brandt, Łukasz
Borkowska, Eliza
Herman-Sucharska, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/2146777.pdf
Data publikacji:
2020
Wydawca:
Indygo Zahir Media
Tematy:
radiografia
artefakt
błąd techniczny
radiography
artifact
technical error
Opis:
W dobie dzisiejszych aparatów rentgenowskich wykonanie idealnego zdjęcia radiologicznego może wydawać się prostym zadaniem. Jednak nawet najbardziej doświadczeni technicy elektroradiologii pracownicy w swojej praktyce spotykają problem artefaktów na obrazach. Ich wystąpienie niejednokrotnie utrudnia lub uniemożliwia postawienie właściwej diagnozy, przez co badania takie muszą być powtarzane, prowadząc do zwiększenia narażenia pacjenta na promieniowanie jonizujące. Znajomość charakterystycznych cech poszczególnych typów artefaktów oraz źródeł ich powstawania jest kluczem do uzyskania poprawnych, diagnostycznych obrazów.
In the age of today’s X-ray machines, taking the perfect image may seem like a simple task. However, even the most experienced radiogrphers face the problem of artifacts in the X-ray images in their practice. Their occurrence often makes it difficult or impossible to make a proper diagnosis, therefore such tests must be repeated, leading to an increased patient’s exposure to ionizing radiation. Knowing the characteristic features of types of artifacts and the sources of their formation is the key to obtaining correct, diagnostic images.
Źródło:
Inżynier i Fizyk Medyczny; 2020, 9, 5; 335--342
2300-1410
Pojawia się w:
Inżynier i Fizyk Medyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal neutron radiography studies of drying of rectangular blocks of wet mortar
Autorzy:
Fijał-Kirejczyk, I. M.
Milczarek, J. J.
de Beer, F. C.
Radebe, M. J.
Nothnagel, G.
Żołądek-Nowak, J.
Powiązania:
https://bibliotekanauki.pl/articles/146714.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
drying
capillary-porous media
mortar
thermal neutron radiography
Opis:
The convectional drying of rectangular block of wet mortar was investigated with thermal neutron radiography technique supplemented with traditional mass and temperature measurements. The time evolution of the drying process was recorded for rectangular sample of aged mortar before and after painting its lateral sides. The receding boundary of the central core wet region was observed in the advanced stage of the process. The size, shape and water content of that region were determined for both cases of non-painted and painted sample. It was shown that in the advanced drying process the receding drying front exists irrespectively of the drying pattern observed at the early period of drying.
Źródło:
Nukleonika; 2012, 57, 4; 529-535
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic neutron radiography studies of water migration in beds of natural zeolite
Autorzy:
Żołądek, J.
Milczarek, J. J.
Fijał-Kirejczyk, I.
Powiązania:
https://bibliotekanauki.pl/articles/148241.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
natural zeolites
water migration
granular media
neutron radiography
Opis:
The results of the experiments on water migration in unsaturated beds of natural zeolite (clinoptilolite) performed with a dynamic neutron radiography technique are presented. It was found that the migration of water in zeolites is much slower than in quartz sand composed of the same size grains. The effect is attributed to the enormous grain surface roughness of the zeolite. The influence of gravity was found to be significant only for beds formed by the coarsest grains. It was found that the water imbibition rate increases with time in finest grain zeolite beds. The results show the difficulties of the classical theory of adhesion driven motion of the liquid in the single capillary as a model of water imbibition by zeolite beds.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 113-119
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A radiographic facility at the Soltan Institute for Nuclear Studies (SINS) at Świerk, Poland
Autorzy:
Bigolas, J.
Drabik, W.
Pławski, E.
Wysocka-Rabin, A.
Powiązania:
https://bibliotekanauki.pl/articles/147478.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
linear accelerator
electron RF accelerator
photon beam
radiography
Opis:
This paper describes the 6 MeV linac electron accelerator facility now operating at SINS, Świerk, Poland. The accelerator can work in both the electron or X-ray photon mode. The photon beam may be used for non-destructive radiographic investigations on a laboratory scale and, with some modifications, for industrial purposes, as well. As the accelerator's removable tungsten e/X converter is placed outside, the beam vacuum window, an external electron beam is also accessible. The design stages of the accelerator's construction are described, and examples of measurements and radiographic pictures are also presented.
Źródło:
Nukleonika; 2006, 51, 2; 131-135
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Digital Radiography (Dr) in an Approach to Evaluate the Technical Condition of MiG-29’s Vertical Stabilizers
Autorzy:
Luziński, Rafał
Synaszko, Piotr
Dragan, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2105179.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
NDT
digital radiography
inspection of internal structures
composite structures
Opis:
The purpose of the work presented was to evaluate the capabilities of digital radiography to detect cracks in the internal structure of MiG-29 vertical stabilizers. The test object was a stabilizer previously subjected to fatigue testing and partially torn down for the needs of visual inspection. An inspection of three regions containing cracked parts was performed, with use of a pulsed x-ray generator and digital detector array. The results confirmed the method could be used to detect cracks in an internal structure which could not be inspected with other methods without affecting the stabilizer’s integrity.
Źródło:
Fatigue of Aircraft Structures; 2021, 13; 1--7
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on water transport in quasi two-dimensional porous systems using neutron radiography
Autorzy:
Fijał-Kirejczyk, Izabela M.
Rogante, Massimo
Milczarek, Jacek J.
Żołądek-Nowak, Joanna
Jurkowski, Zdzisław
Żołądek, Jan
Rusinek, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2105332.pdf
Data publikacji:
2022
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
water transport
drying
fractal
neutron radiography
wettability
wicking
wetting
Opis:
The spontaneous wetting and drying of flat porous samples of linen, cotton and synthetic textiles were studied using dynamic neutron radiography (DNR). The progress of the wetting process of the media was delineated from the obtained neutron dynamical radiography images. The results of the investigation reveal a non-classical behaviour of kinetics of wicking of these materials. The character of the wetting kinetics is discussed in terms of the fractal character of the tortuosity of fabric capillaries.
Źródło:
Nukleonika; 2022, 67, 1; 3--9
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory methods for testing the performance of pyrotechnic delay elements
Autorzy:
Warchol, R.
Nita, M.
Powiązania:
https://bibliotekanauki.pl/articles/30146954.pdf
Data publikacji:
2018
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
pyrotechnic delay element
ammunition
X-ray radiography
thermal imaging
Opis:
Pyrotechnic delay elements owing to their simple structure and reliability are very often used as part of the design of ammunition. Their basic task consists in generating a specified delay between the respective actions of two elements/systems, required to ensure the safe and reliable work of ammunition. The paper presents laboratory methods employed for testing the performance of pyrotechnic delay elements (PDEs) used in means of combat. The introductory part describes pyrotechnical delay elements and the task fulfilled by them in ammunition. The next part discusses performance parameters of pyrotechnic delay elements, decisive for their proper operation, and factors influencing such operation. In its main part the article presents the standard defining the laboratory methods to be employed for testing pyrotechnic delay elements. According to the above-mentioned standard, the laboratory methods of testing pyrotechnic delay elements can be divided into tests in the open and closed systems. Further, the paper discusses both types of test systems. Taking account of a wide thematic scope of the discussed issue, this article focuses mainly on presenting new methods of testing pyrotechnic delay elements, which have not been mentioned in the standard. Provided examples of tests of pyrotechnic delay elements have been taken from the Polish and foreign literature. Two methods of testing pyrotechnic delay elements are worth paying special attention, one making use of a thermal imaging camera, and the other relying on Roentgen radiation.
Źródło:
Scientific Journal of the Military University of Land Forces; 2018, 50, 4(190); 101-115
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
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