Janusz Braziewicz

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Uncertainties in the measurement of relative doses in radiotherapy

Krzysztof Buliński, Tomasz Kuszewski, Katarzyna Wnuk, Janusz Braziewicz, more

Polish Journal of Medical Physics and Engineering > 2021 > Vol. 27, Iss. 1 > 1--9

Both the measurement of the dose and the measurement of its distribution, like any other measurements, are subject to measurement uncertainties. These uncertainties affect all dose calculations and dose distributions in a patient’s body during treatment planning in radiotherapy. Measurement uncertainty is not a medical physicist's error, but an inevitable element of their work. Planning the dose distribution...

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Wirtualna radioterapia – nowe narzędzie w procesie edukacji fizyków medycznych

Krzysztof Buliński, Tomasz Kuszewski, Katarzyna Wnuk, Piotr Kędzierawski, more

Inżynier i Fizyk Medyczny > 2020 > Vol. 9, nr 3 > 153--158

Fizyk medyczny to zawód, który wymaga umiejętności zastosowania metod fizyki w medycynie. Jeżeli dziedziną medycyny jest radioterapia, wówczas należy nauczyć się wykorzystania metod pomiarowych promieniowania jonizującego (dozymetria kliniczna) oraz informatyki (systemy planowania leczenia) w praktyce klinicznej. W procesie dydaktycznym wymagane jest wykorzystanie sprzętu medycznego, który jest w...

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Biological effects of mixed-ion beams. Part 1: Effect of irradiation of the CHO-K1 cells with a mixed-ion beam containing the carbon and oxygen ions

Joanna Czub, Dariusz Banaś, Janusz Braziewicz, Iwona Buraczewska, more

Applied Radiation and Isotopes > 2018 > 139 > C > 304-309

Carbon and oxygen ions were accelerated simultaneously to estimate the effect of irradiation of living cells with the two different ions. This mixed ion beam was used to irradiate the CHO-K1 cells, and a survival test was performed. The type of the effect of the mixed ion beam on the cells was determined with the isobologram method, whereby survival curves for irradiations with individual ion beams...

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Investigation of the bystander effect in CHO-K1 cells

Urszula Kaźmierczak, Dariusz Banaś, Janusz Braziewicz, Iwona Buraczewska, more

Reports of Practical Oncology & Radiotherapy > 2014 > 19 > Supplement > S37-S41

Investigation of the bystander effect in Chinese Hamster Ovary cells (CHO-K1) co-cultured with cells irradiated in the dose range of 0.1–4Gy of high LET ¹² C ions and X-rays.The radiobiological effects of charged heavy particles on a cellular or molecular level are of fundamental importance in the field of biomedical applications, especially in hadron therapy and space radiation biology.A...

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Analysis of Copper Concentration in Human Serum by Application of Total Reflection X-ray Fluorescence Method

Aldona Kubala-Kukuś, Dariusz Banaś, Janusz Braziewicz, Urszula Majewska, more

Biological Trace Element Research > 2014 > 158 > 1 > 22-28

The chemotherapy and photon radiotherapy are the most often applied methods in treatment of the cancer diseases because of their effectiveness and high cure rates. Apart from eligible destruction of the tumour, one of the side effects of these treatment methods is possible modification of main and trace element concentration in different human tissues and fluids. In this paper, the copper (Cu) level...

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Micronuclei in human peripheral blood lymphocytes exposed to mixed beams of X-rays and alpha particles

Elina Staaf, Karl Brehwens, Siamak Haghdoost, Sander Nievaart, more

Radiation and Environmental Biophysics > 2012 > 51 > 3 > 283-293

The purpose of this study was to analyse the cytogenetic effect of exposing human peripheral blood lymphocytes (PBL) to a mixed beam of alpha particles and X-rays. Whole blood collected from one donor was exposed to different doses of alpha particles (²⁴¹Am), X-rays and a combination of both. All exposures were carried out at 37 °C. Three independent experiments were performed. Micronuclei (MN) in...

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The yield of radiation-induced micronuclei in early and late-arising binucleated cells depends on radiation quality

Christian Johannes, Anne Dixius, Mareike Pust, Reinhard Hentschel, more

Mutation Research - Genetic Toxicology and Environmental Mutagenesis > 2010 > 701 > 1 > 80-85

There are conflicting data regarding the effect of culturing time of human peripheral blood lymphocytes on the yield of chromosomal aberrations induced by sparsely ionising radiation in the G ₀ phase of the cell cycle. While some authors find that the yield of aberrations does not change with time, others find increased frequencies of aberrations with harvesting time. The reasons for the conflicting...

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Elemental concentrations in tropospheric and lower stratospheric air in a Northeastern region of Poland

Janusz Braziewicz, Ludwika Kownacka, Urszula Majewska, Andrzej Korman

Atmospheric Environment > 2004 > 38 > 13 > 1989-1996

Element concentrations of K, Ca, Ti, Cr, Fe, Ni, Cu, Zn, Se, Br, Sr and Pb as well as the activity of natural radionuclides ² ¹ ⁰ Pb and ² ² ⁶ Ra in air were measured. The aerosol samples were collected during tropospheric and stratospheric aircraft flights over the Northeastern region of Poland, which is mostly an agricultural and wooded area. The air volumes were...

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Selenium, copper, and zinc concentrations in intestinal cancer tissue and in colon and rectum polyps

Marek Kucharzewski, Janusz Braziewicz, Urszula Majewska, Stanislaw Góźdź

Biological Trace Element Research > 2003 > 92 > 1 > 1-10

The prospective randomized trial was used to determine Se, Zn, and Cu concentrations in intestinal cancer tissue and colorectal polyp. We also determined the relationship among the trace element levels in cancer tissue, the localization of neoplasms, and the stage of their development. The concentrations of these trace elements were examined in cancer tissue of the colorectum in 67 patients and in...

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Iron concentrations in intestinal cancer tissue and in colon and rectum polyps

Marek Kucharzewski, Janusz Braziewicz, Urszula Majewska, Stanislaw Góźdź

Biological Trace Element Research > 2003 > 95 > 1 > 19-28

A prospective randomized trial was used to determine iron concentrations in intestinal cancer tissue and colorectum polyps. We investigated the possible difference between the concentrations of iron, ferritin, albumin, and hemoglobin in the serum of patients with colorectal cancer and polyps. We also determined the relationship between the iron and ferritin levels in cancer tissue, the localization...

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Concentration of selected elements in the roots and crowns of both primary and permanent teeth with caries disease

Barbara Gierat-Kucharzewska, Janusz Braziewicz, Urszula Majewska, Stanisław Góźdz, more

Biological Trace Element Research > 2003 > 96 > 1-3 > 159-167

We examined the differences between the concentrations of chemical elements in caries-changed primary teeth and permanent ones with a division into the root and the crown. The study comprised 27 children aged from 4 to 11 yr and 36 adults aged from 36 to 71 yr. We examined the elements with the total reflection X-ray fluorescence method. The lowest concentrations of calcium, manganese, strontium,...

article

Zn concentration in thyroid tissue and whole blood of women with different diseases of thyroid

Urszula Majewska, Janusz Braziewicz, Dariusz Banaś, Aldona Kubala-Kukuś, more

Biological Trace Element Research > 2001 > 80 > 3 > 193-199

The Zn concentration in thyroid tissue and whole blood of patients with Graves’ disease, thyroid cancer, and nodular goiter disease was determined using the total-reflection X-ray fluorescence method. The dependence of obtained concentrations on the clinical stage of the examined disease, histopathological grading, and kind of analyzed material (thyroid tissue and blood) was studied. The determined...

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Search results for: Janusz Braziewicz

Uncertainties in the measurement of relative doses in radiotherapy

Wirtualna radioterapia – nowe narzędzie w procesie edukacji fizyków medycznych

Biological effects of mixed-ion beams. Part 1: Effect of irradiation of the CHO-K1 cells with a mixed-ion beam containing the carbon and oxygen ions

Investigation of the bystander effect in CHO-K1 cells

Analysis of Copper Concentration in Human Serum by Application of Total Reflection X-ray Fluorescence Method

Micronuclei in human peripheral blood lymphocytes exposed to mixed beams of X-rays and alpha particles

The yield of radiation-induced micronuclei in early and late-arising binucleated cells depends on radiation quality

Elemental concentrations in tropospheric and lower stratospheric air in a Northeastern region of Poland

Selenium, copper, and zinc concentrations in intestinal cancer tissue and in colon and rectum polyps

Iron concentrations in intestinal cancer tissue and in colon and rectum polyps

Concentration of selected elements in the roots and crowns of both primary and permanent teeth with caries disease

Zn concentration in thyroid tissue and whole blood of women with different diseases of thyroid

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