Autor: Mirowski, Mateusz - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Nowe-stare metody redukcji i monitoringu narażenia na promieniowanie rentgenowskie w środowisku zabiegowym
New-old methods of reducing and monitoring X-ray exposure in the interventional radiology environment
Autorzy:: Mirowski, Mateusz M.
Tematy:: radiologia interwencyjna
ochrona radiologiczna
promieniowanie rentgenowskie
kardiologia interwencyjna
osłony
sposoby redukcji i monitoringu
interventional radiology
radiation protection
X-rays
interventional cardiology
radiation shielding
methods of reduction and monitoring; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/2082614.pdf Link otwiera się w nowym oknie
Opis:: Odkrycie promieniowania jonizującego przyniosło wiele korzyści również w medycynie. Związane z nim ryzyko wywoływania chorób, takich jak nowotwory popromienne czy zaćma, skutkuje koniecznością monitorowania narażenia osób pracujących w ekspozycji na promieniowanie jonizujące za pomocą dozymetrii indywidualnej lub optymalizacji procedur medycznych. Istnieją 3 główne sposoby optymalizacji procedur medycznych – redukcja czasu, zwiększenie odległości oraz stosowanie osłon osobistych i stałych. Wraz z rozwojem nauki i techniki ewoluują sposoby zmniejszania dawki. Poza lepszą osłonnością wzrasta także ergonomia, jak w przypadku osłony Zero-Gravity i lekkich fartuchów bezołowiowych. Rośnie także świadomość konieczności stosowania osłon i prowadzenia zabiegu tak, aby zmniejszyć narażenie zarówno personelu, jak i pacjenta. Celem artykułu jest przedstawienie nowych metod ochrony przed promieniowaniem jonizującym w kontekście powyższych 3 pryncypiów ochrony radiologicznej.
Ionizing radiation as a scientific achievement provides a variety of advantages, e.g., in the medical field. However, it also causes a risk of some illnesses, e.g., cataract or cancer. This results in the need to measure radiation doses and to reduce the unnecessary risk. There are 3 main methods of dose reduction, i.e., shortening the time of exposure, working as far as possible from the X-ray source, and using radioprotective shields. Together with the development of science and technology, dose reduction methods and radioprotection methods have also evolved. Besides improved shielding, the ergonomics is also more advanced, e.g., the zero-gravity shielding or light, and non-lead aprons. What is more, the awareness of using radiological protection and conducting the surgery in the safest way for both the staff and the patient is growing up. The goal of this article is to discuss the newest methods of radiation protection against the background of 3 main protection principles.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Patient and physician exposure to X-rays at pediatric interventional cardiology – from world to Poland
Autorzy:: Mirowski, Mateusz
Domienik-Andrzejewska, Joanna
Moszura, Tomasz
Tematy:: occupational exposure
optimization
ionizing radiation
pediatric cardiology
patient exposure
interventional cardiology; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/55991950.pdf Link otwiera się w nowym oknie
Opis:: Ionizing radiation is considered as a harmful factor to health. However, X‑rays are widely used in diagnostic and therapeutic procedures such as those performed during cardiac interventions. Their use is particularly invaluable in saving life procedures when the risk of adverse effects of radiation is relatively low compared to the consequences of non-treated or treated with other invasive methods diseases. One branch of these types of medical procedures is interventional cardiology in pediatrics due to possible higher than in adults risks of developing cancer in exposed to ionizing radiation children. On the other hand, medical staff in particular physician, may be exposed to relatively high radiation levels during their work. Parallel with enlarging workload (growing number of procedures per year), high levels of cumulative doses to most exposed, and often not protected, parts of operator’s body as eye lenses and brain may be achieved. Exposure to X‑rays in pediatric interventional cardiology is a worldwide point of scientific interest from around 65 years, however assessment and simulating low level doses is still developing. In this review found data presents various trials of evaluating doses or levels of exposure to both medical staff and patient as well as methods of optimization and protection against X‑rays in pediatric cardiac interventional procedures. The issue of establishing diagnostic reference levels was also taken into consideration during analysis. Thirty papers from period 2013 to 2023 were analyzed. The main assumption of this condensed review is to reveal radiation protection methods worldwide and in Poland.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ionizing radiation and volumetric mammographic density
Autorzy:: Pepłońska, Beata
Mirowski, Mateusz
Kałużny, Paweł
Domienik-Andrzejewska, Joanna
Tematy:: breast cancer
ionizing radiation
mammography
effective dose
mammographic density
organ dose; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/2152984.pdf Link otwiera się w nowym oknie
Opis:: Objectives Mammographic density (MD) refers to the percentage of dense tissue of an entire breast and was proposed to be used as a surrogate marker for breast cancer. High-dose ionizing radiation (IR) has been recognized as a breast cancer risk factor. The aim of our study was to investigate association between lifetime low dose ionizing radiation (LDIR) and MD. Material and Methods A cross-sectional study included 467 women aged 40–60 years who underwent screening mammography in Łódź, Poland. The digital mammography examination of the breasts included both craniocaudal and mediolateral oblique views. The volumetric breast density (VBD) (%) and fibrograndular tissue volume (FG) (cm3) were determined based on the analysis of mammographic image (“for processing”) using Volpara Imaging Software. The exposure to IR was estimated for each individual, based on the data from interviews about diagnostic or therapeutic medical procedures performed in the area of the neck, chest, abdomen and spine, which involved X-rays and γ rays and the data about the doses derived from literature. Linear and logistic regression were fitted with VBD and FG as the outcomes and organ breast dose, effective dose and number of mammographies as the determinants, adjusted for major confounders. Results The analyses showed no association between VBD or FG and the breast organ dose or the effective dose. The only significant finding observed concerned the association between the number of mammographies and the FG volume with β coefficient: 0.028 (95% CI: 0.012–0.043), and predicted mean FG volume >13.4 cm3 among the women with >3 mammographies when compared to those with none. Conclusions This study does not, in general, provide support for the positive association between LDIR and MD. The weak association of the FG volume with the number of mammographies warrants further verification in larger independent studies.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Occupational exposure to physicians working with a Zero-Gravity™ protection system in haemodynamic and electrophysiology labs and the assessment of its performance against a standard ceiling suspended shield
Autorzy:: Mirowski, Mateusz
Górnik, Tomasz
Domienik-Andrzejewska, Joanna
Jastrzębski, Marek
Grabowicz, Włodzimierz
Warchoł, Izabela
Masiarek, Konrad
Opis:: A two centre clinical study was performed to analyse exposure levels of cardiac physicians performing electrophysiology and haemodynamic procedures with the use of state of the art Zero-Gravity™ radiation protective system (ZG). The effectiveness of ZG was compared against the commonly used ceiling suspended lead shield (CSS) in a haemodynamic lab. The operator’s exposure was assessed using thermoluminescent dosimeters (TLDs) during both ablation (radiofrequency ablation (RFA) and cryoablation (CRYA)) and angiography and angioplasty procedures (CA/PCI). The dosimeters were placed in multiple body regions: near the left eye, on the left side of the neck, waist and chest, on both hands and ankles during each measurement performed with the use of ZG. In total 29 measurements were performed during 105 procedures. To compare the effectiveness of ZG against CSS an extra 80 measurements were performed with the standard lead apron, thyroid collar and ceiling suspended lead shield during CA/PCI procedures. For ZG, the upper values for the average eye lens and whole body doses per procedure were 4 µSv and 16 µSv for the left eye lens in electrophysiology lab (with additionally used CSS) and haemodynamic lab (without CSS), respectively, and about 10 µSv for the remaining body parts (neck, chest and waist) in both labs. The skin doses to hands and ankles non-protected by the ZG were 5 µSv for the most exposed left finger and left ankle in electrophysiology lab, while in haemodynamic lab 150 µSv and 17 µSv, respectively. The ZG performance was 3 times (p < 0.05) and at least 15 times (p < 0.05) higher for the eye lenses and thoracic region, respectively, compared to CSS (with dosimeters on the apron/collar). However, when only ZG was used slightly higher normalised doses were observed for the left finger compared to CSS (5.88e − 2 Sv/Gym2 vs. 4.31 e − 2 Sv/Gym2, p = 0.016). The study results indicate that ZG performance is superior to CSS. It can be simultaneously used with the ceiling suspended lead shield to ensure the protection to the hands as long as this is not obstructive for the work.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Rheological properties of polypropylene composites with calcium carbonate under high shear rates
Właściwości reologiczne kompozytów polipropylenu z węglanem wapnia w warunkach dużych szybkości ścinania
Autorzy:: Kloziński, Arkadiusz
Lewandowski, Krzysztof
Mirowski, Jacek
Barczewski, Mateusz
Jakubowska, Paulina
Tematy:: polymer composites
injection moulding
rheological properties
in-line rheology
kompozyty polimerowe
wtryskiwanie
właściwości reologiczne
reologia in-line; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Powiązania:: https://bibliotekanauki.pl/articles/24202843.pdf Link otwiera się w nowym oknie
Opis:: The rheological properties of isotactic polypropylene (iPP) and its composites with unmodified and stearic acid-modified calcium carbonate (5, 10, 20, 30 wt%) were investigated. The processability factor K of the composites was determined based on changes in the mass flow rate (MFR). The assessment of rheological properties was carried out at high shear rates, in the injection process, using a special in-line measuring head. Measurements were performed at a temperature of 230°C, in the range of apparent shear rate from 19,100 to 101,900 s-1, based on the Ostwald-de Waele power-law model. Comparative analysis of the processing and rheological characteristics, as determined with two techniques (off-line measurements and in-line measurements), has shown a diverse behaviour of polymer composites in flows (flow resistances, the behaviour of the flow and viscosity curves, the power law index), resulting from a varying fill degree, applied filler type and measuring shear rate range.
Zbadano właściwości reologiczne izotaktycznego polipropylenu (iPP) oraz jego kompozytów z niemodyfikowanym i modyfikowanym kwasem stearynowym węglanem wapnia (5, 10, 20, 30% mas.). Współczynnik przetwarzalności K kompozytów określano na podstawie zmian masowego wskaźnika szybkości płynięcia (MFR). Ocenę właściwości reologicznych przeprowadzono w warunkach dużych szybkości ścinania, w procesie wtryskiwania, przy zastosowaniu specjalnej głowicy pomiarowej typu in-line. Pomiary wykonano w temperaturze 230°C, w zakresie pozornej szybkości ścinania od 19 100 do 101 900 s-1, w oparciu o model potęgowy Ostwalda-de Waele’a. Analiza porównawcza charakterystyk przetwórczych i reologicznych, wyznaczonych dwoma technikami pomiarowymi (off-line i in-line), wykazała zróżnicowany sposób zachowania się kompozytów polimerowych w przepływach (opory przepływu, przebiegi krzywych płynięcia i lepkości, wykładnik płynięcia), wynikający z różnego stopnia napełnienia, rodzaju zastosowanego napełniacza oraz zakresu pomiarowego szybkości ścinania.
Dostawca treści:: Biblioteka Nauki

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