Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "brachytherapy" wg kryterium: Temat


Tytuł:
Analiza wyników samodzielnej radioterapii chorych na raka endometrium
Radiotherapy as sole treatment of endometrial cancer. Analysis of treatment outcome
Autorzy:
Jóźwik, Piotr
Karolewski, Kazimierz
Kojs, Zbigniew
Jakubowicz, Jerzy
Blecharz, Paweł
Urbański, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/908391.pdf
Data publikacji:
2007
Wydawca:
Medical Communications
Tematy:
brachytherapy
endometrial cancer
irradiation
radiotherapy
Opis:
Radiotherapy was used as a stand-alone therapeutic modality in 155 patients with endometrial cancer, treated at the Cracow Branch of the Center of Oncology since 1988 thru 1999. In these patients surgical excision was impossible due to far-advanced cancer (clinical stages III and IV) (n=50), severe comorbidity and poor performance status (n=105). In this patient population, 50 persons in clinical stage I received intracavitary brachytherapy, while the remaining 105 patients in clinical stages II, III and IVA received external beam irradiation followed by intracavitary brachytherapy. In the entire group (n=155), cumulative symptom-free 5 year survival rate was 51% (n=79). In relation to tumour grade, 5 year symptom- free survival rate was 70.3% in patients with well differentiated tumour, 43.5% in those with intermediate- grade tumour and only 20% in persons with poorly differentiated cancer. In patients with stage I endometrial cancer, symptom-free 5 year survival rate was 82% (n=41/50); in clinical stage II – 54.5% (30/55), in clinical stages III and IVA – 16% (8/50). Multivariate Cox analysis revealed that independent prognostic factors were clinical stage and tumour grade. Cure rates were 82%, 54.4% and 16% in clinical stages I, II and III/IVA, respectively. Symptom-free 5-year survival rates were 70.3%, 43.5% and 20% in well-differentiated, intermediate- and poorly-differentiated tumours, respectively. Severe late complications of radiotherapy (3rd and 4th degree) developed in 3.5% of patients.
W latach 1988-1999 w krakowskim Oddziale Centrum Onkologii (COOK) leczono pierwotnie napromienianiem 155 chorych na raka endometrium (RE), u których niemożliwe było wykonanie zabiegu operacyjnego z powodu zbyt dużego zaawansowania raka (stopnie III i IV) (50 chorych), ciężkich chorób towarzyszących i złego stanu sprawności (105 chorych). U 50 chorych na RE w I stopniu zaawansowania zastosowano wyłącznie brachyterapię dojamową, u pozostałych 105 (stopnie II, III i IVA) brachyterapię dojamową skojarzono z uprzednią teleradioterapią. Spośród 155 chorych badanej grupy 79 pacjentek (51%) przeżyło 5 lat bez objawów nowotworu. Pięć lat bez objawów nowotworu przeżyło 70,3% chorych na wysoko zróżnicowanego, 43,5% na średnio zróżnicowanego i 20% na nisko zróżnicowanego raka. Spośród 50 chorych na raka w I stopniu zaawansowania 5 lat bez objawów choroby przeżyło 41 (82%) pacjentów, spośród 55 chorych na raka w II stopniu zaawansowania - 30 (54,5%), a spośród 50 chorych na raka w stopniach III i IVA - tylko 8 (16%). W wielocechowej analizie Coksa niezależnymi czynnikami prognostycznymi były zaawansowanie kliniczne i stopień zróżnicowania raka. Wyleczono 82% chorych na RE w I stopniu zaawansowania, 54,5% w II stopniu i tylko 16% w stopniach III i IVA. Pięć lat bez objawów nowotworu przeżyło odpowiednio 70,3%, 43,5% i 20% chorych na wysoko, średnio i nisko zróżnicowanego raka. Odległe, ciężkie powikłania (stopnie 3. i 4.) radioterapii wystąpiły jedynie u 3,5% chorych.
Źródło:
Ginekologia Onkologiczna; 2007, 5, 3; 151-158
1731-5379
Pojawia się w:
Ginekologia Onkologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray tube with needle-like anode
Autorzy:
Słapa, M.
Straś, W.
Traczyk, M.
Dora, J.
Snopek, M.
Gutowski, R.
Drabik, W.
Powiązania:
https://bibliotekanauki.pl/articles/147038.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
brachytherapy
photon needle
X-ray tube
Opis:
An X-ray tube with a needle-like anode (NAXT) built in our Laboratory, its design and basic operating parameters are presented. The process of electron beam forming and influence of external and internal magnetic fields is discussed. The tube properties essential from the point of view of its application in X-ray generators as well as disadvantageous thermal effects caused by flow of heat generated in the tube target to irradiated objects are discussed. The tube is almost a point-like source of X radiation emitted into 4đ geometry; the dose rates are on the order of 1 Gy/min at the distance of 10 mm from the anode cap. Preliminary tests show the tube may be useful in brachytherapy of cancer tumors of diameter up to 30 mm. The tube may also be an interesting device in widely understood field of irradiation techniques.
Źródło:
Nukleonika; 2002, 47, 3; 101-105
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zintegrowana linia radioterapeutyczna
The integrated radiotherapeutic line
Autorzy:
Miloch, W.
Wtorek, J.
Powiązania:
https://bibliotekanauki.pl/articles/268096.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
teleradioterapia
brachyterapia
akcelerator
teleradiotherapy
brachytherapy
accelerator
Opis:
Zintegrowana linia radioterapeutyczna (ZLR) stanowi złożenie sprzętu i oprogramowania służącego do precyzyjnej radioterapii. W pierwszej kolejności w referacie wyjaśniono różnice pomiędzy teleradioterapią, a brachyterapią, które stanowią podstawowe rodzaje radioterapii. Następnie przedstawiono budowę i funkcje poszczególnych części ZLR: tomografu komputerowego, systemu planowania leczenia, symulatora i akceleratora. W dalszej kolejności przedstawiono typy komputerów sterujących ich pracą. Opis ten zawiera krótką charakterystykę konfiguracji, systemu operacyjnego, sposobu zasilania i komunikacji z pozostałymi komputerami. W referacie przedstawiono także modyfikacje ZLR, które były konieczne do uzyskania zadawalającego poziomu bezpieczeństwa napromienianych pacjentów. Na zakończenie referatu poruszono problematykę rozwoju linii terapeutycznej dla części brachyterapii jak i teleradioterapii.
The Integrated Radiotherapeutic Line (IRL) constitutes composition of hardware and software for accurate radiotherapy. First, the paper explains the differences between teleradiotherapy and brachytherapy. Next, a structure of IRL is presented and functions of separate parts are described. The types of control computers are presented as well as a short technical characteristic of hardware, computer network and operating system. Another issue of the paper presents modifications of the Integrated Radiotherapeutic Line, which were necessary to achieve an appropriate level of patient’s safety. Problems arising in the course of the line integration are also presented. Finally, the paper presents issues of development of therapeutic line for brachytherapeutic part and teleradiotherapy part.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2009, 26; 97-100
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radioisotopes for medical and industrial use during the 50-year history of the Institute of Nuclear Research
Autorzy:
Mikołajczak, R.
Bazaniak, Z.
Iller, E.
Powiązania:
https://bibliotekanauki.pl/articles/147948.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radiopharmaceuticals
isotope application
sealed sources
radiotherapy
brachytherapy
Opis:
The paper summarises the 50-years long history of the development of research programmes related to the practical applications of radionuclides in various fields of the Polish economy. The changing trends of interest of the potential users are reflected in the research and development activities of the Radioisotope Centre POLATOM. In the 1960's and 1970's the main areas of activity were focused on the sealed sources and radiolabelled compounds for the investigation of industrial processes. The introduction to the routine practice of the RIA and the IRMA kits for hormonal in vitro diagnostics in the 70-ties and 80-ties resulted in the general availability of this diagnostic technique in Poland. The number of radioisotopes having the required radiation type, energy and half-life is steadily increasing due to the progress in irradiation facilities and in chemical separation processes. The need for modern radiopharmaceuticals, more specific and providing higher diagnostic and therapeutic potential as an alternative to other medical modalities is reflected in the research programmes carried out and implemented currently at the Radioisotope Centre POLATOM.
Źródło:
Nukleonika; 2005, 50,suppl.3; 83-87
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tubing decontamination during the leak test of iodine-125 seeds
Autorzy:
Moura, J. A.
Moura, E. S.
Sprenger, F. E.
Nagatomi, H. R.
Zeituni, C. A.
Feher, A.
Manzoli, J. E.
Souza, C. D.
Rostelato, M. E.
Powiązania:
https://bibliotekanauki.pl/articles/148765.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
brachytherapy
iodine seeds
leak test
sealed radioactive sources
Opis:
Leak tests were made to detect any leakage of radioactive material from inside the iodine-125 seeds applied in brachytherapy. These seeds are used in prostate cancer treatment. In the quality control routine, during seed production, leak tests are performed according to the International Standard Organization – radiation protection – sealed radioactive sources – ISO-9978 standard, and require liquid transfer between recipients. Any leakage causes contamination of the liquid and tubes. The aim of this study is the establishment of decontamination routines for tubes, allowing their repeated use, in the automated assay process.
Źródło:
Nukleonika; 2010, 55, 3; 409-413
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dose enhancement in brachytherapy in the presence of gold nanoparticles : a Monte Carlo study on the size of gold nanoparticles and method of modelling
Autorzy:
Ghorbani, M.
Pakravan, D.
Bakhshabadi, M.
Meigooni, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/146605.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
brachytherapy
dose enhancement
gold nanoparticles
Monte Carlo (MC)
Opis:
The aim of this study was to evaluate the effect of the size of gold nanoparticles (GNPs) on dose enhancement in brachytherapy with photon emitting sources. Four photon emitting sources, 125I, 169Yb, 103Pd, and 192Ir were simulated and dose rate constant and radial dose functions were compared with published corresponding data for these sources. Dose enhancement factor in the presence of gold nanoparticles of 30 mg/ml concentration was calculated separately for nanoparticles with a diameter of 50, 100 and 200 nm. Gold nanoparticles were simulated precisely as nanospheres utilizing a lattice option in the MCNPX Monte Carlo code and the results were compared with those obtained with a simple model in which gold atoms are distributed uniformly in tumor volume as a simple mixture. Among the four mentioned sources, the dose enhancement related to 125I source is higher. Our results have shown that with gold nanoparticles of higher diameter, the level of dose enhancement is higher in the tested tumor. It has been also observed that the simple model overestimates the dose enhancement factor when compared with the precise model in which nanoparticles are defined according to the Monte Carlo code. In the energy range produced by the brachytherapy sources, the dose enhancement is higher when using brachytherapy sources with lower energy. Among the size range of gold nanoparticles used in medicine, it is predicted that nanoparticles with higher diameter can be more useful when are utilized in brachytherapy. It is also recommended that when calculating dose enhancements, a precise model be used for modelling of nanoparticles in the Monte Carlo simulations.
Źródło:
Nukleonika; 2012, 57, 3; 401-406
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An approach to the preparation of iodine-125 seed-type sources
Autorzy:
Cieszykowska, I.
Piasecki, A.
Mielcarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/148791.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
iodine-125 sealed sources
seed-type sources
brachytherapy sources
Opis:
The deposition of iodine-125 on silver bars to be sealed in titanium capsules as seed-type sources for brachytherapy was studied. For this purpose, a method of internal electrolysis was applied. The cell consisted of a silver anode contained in a Pt crucible serving as cathode. The plating solution contained sodium iodide-125 and sodium hydroxide. The yield of iodine-125 deposition for carrier-containing and carrier-free electrolyte solutions was determined. The deposition on uncutted Ag wires and on those cutted into 3 mm long bars was investigated. The influence of visible light on the coating process was examined. The leachability of iodine-125 from the silver wires as well as the activity distribution on the wires was measured. The obtained results indicate that the silver wire should be first coated with iodine-125 and then cutted into 3 mm long pieces. Based on this observation, a device for a batch-type procedure of manufacturing I-125 plated silver bars was designed and made. A design for simultaneous cutting and positioning of the activity-carrying bars into the titanium capsules is presented. This arrangement has been built and tested in trials. The tests confirmed that contamination of the source capsules can be minimized. Laser weldings of the titanium capsules were performed and the cross section of the welds examined by the use of an optical microscope.
Źródło:
Nukleonika; 2005, 50, 1; 17-22
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an automation system for iodine-125 brachytherapy seed encapsulated by Nd:YAG laser welding
Autorzy:
Somessari, S. L.
Feher, A.
Sprenger, F. E.
Rostelato, M. E. C. M.
da Costa, F. E.
Calvo, W. A. P.
Powiązania:
https://bibliotekanauki.pl/articles/147664.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
iodine-125 seeds
prostate cancer
brachytherapy
Nd:YAG laser welding
Opis:
The aim of this work is to develop an automation system for iodine-125 radioactive seed production by Nd:YAG laser welding, which has been used successfully in low dose rate (LDR) brachytherapy treatment. This small seed consists of a welded titanium capsule, with 0.8 mm in diameter and 4.5 mm in length, containing iodine-125 adsorbed onto a silver rod. The iodine-125 seeds are implanted into the human prostate to irradiate the tumor for cancer treatment. Nowadays, the Radiation Technology Center, at Institute for Nuclear and Energy Research, Săo Paulo, Brazil (IPEN-CNEN/SP) imports and distributes 36,000 iodine-125 seeds per year, for the clinics and hospitals in the country. However, the Brazilian market potential is now over 8,000 iodine-125 seeds per month. The local production of these iodine-125 radioactive sources became a priority for the Institute, in order to reduce the price and the problems of prostate cancer management. It will permit to spread their use to a larger number of patients in Brazil. On the other hand, the industrial automation plays an important role for iodine-125 seeds in order to increase the productivity, with high quality and assurance, avoiding human factors, implementing and operating with good manufacturing practices (GMP). The technology consists of appliance electronic and electro-mechanical parts and components to control machines and processes. The automation system technology for iodine-125 seed production developed in this work was mainly assembled employing a programmable logic controller (PLC), a stepper motor, an Nd:YAG laser welding machine and a supervisory. The statistical repeatability of correctly encapsulated sealed sources with this automation system is greater than 95 per cent.
Źródło:
Nukleonika; 2011, 56, 4; 369-374
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation stability of 125I-brachytherapy sources
Autorzy:
Saxena, S.
Ram, R.
Dash, A.
Joshi, P.
Venkatesh, M.
Powiązania:
https://bibliotekanauki.pl/articles/148254.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
retinoblastoma
125 I-brachytherapy sources
radiation stability
SEM
leach rate
Opis:
Low energy 125I-brachytherapy sources are used for the treatment of retinoblastoma and many other forms of eye cancer. Such sources were prepared by adsorption of 125I on palladium coated silver rods and were critically evaluated for safety aspects, as per AERB standards. In order to attain low leachability and to facilitate leak free laser encapsulation of sources within titanium capsules of size 0.8 mm (f) ´ 4.75 mm (l), the radioactive source core was coated with polystyrene. With a view to study the radiation stability of such sources over a period of three weeks, both polymer coated radioactive sources and inactive source cores were separately subjected to an integrated gamma dose of ~(17.85 ´ 104) Gy (17.85 MRad), which is the dose expected to be received in three weeks from a source containing ~ 111 MBq of 125I. This was carried out to test their suitability for reuse within such period. SEM pictures of inactive source cores were taken to observe the effect of gamma radiation on palladium coating. Post-irradiation leachability and uniformity of activity of radioactive sources were evaluated and found to be satisfactory. The sources were found to be reusable safely, for repeated brachytherapy procedures over a practically useful time of at least three weeks.
Źródło:
Nukleonika; 2007, 52, 1; 13-16
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the geometry function for a brachytherapy seed, comparing MCNP results with TG-43U1 analytical approximations
Autorzy:
Raisali, G.
Ghonchehnazi, M. G.
Shokrani, P.
Sadeghi, M.
Powiązania:
https://bibliotekanauki.pl/articles/146748.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
analytical approximation
brachytherapy
geometry function
MCNP
TG-43U1
Opis:
Geometry function is the only dosimetry parameter of a brachytherapy source seed, introduced in TG-43U1 protocol which is determined using calculational methods rather than physical measurement. In order to evaluate the accuracy of point and line source approximations, for calculation of the geometry function, the MCNP computer code has been used for a typical brachytherapy seed and the results have been compared. The MCNP has been used to simulate the geometry and activity distribution of a Pd-103 seed in order to calculate the geometry function for various angles and distances from the source. The comparison of results shows that at distances close to the source, the values predicted with different methods are not in agreement. The difference between the MCNP calculations and line approximation for small angles from ? = 0 to 15° is about 27% at 0.25 cm from the seed center. This difference is so much higher for point source approximation (up to a factor of 3) even up to distances of 0.5 cm from the source. As ? increases, the difference between MCNP and approximate methods is reduced. Therefore, for small distances from brachytherapy seeds, it is recommended to calculate the geometry function using more detailed methods instead of point and linear source approximations. This will provide more accurate results for other TG-43U1 dosimetry parameters such as radial dose function or anisotropy function which for some points are calculated via interpolation or extrapolation of the available discrete dosimetry data.
Źródło:
Nukleonika; 2008, 53, 2; 45-49
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies