Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A research group on medical physics studies dosimetry in radiotherapy through Monte Carlo techniques

05.02.2007
The mathematical tool, quite used in Medical Physics, takes its name from the city of Montecarlo, well-known for its bingo halls and games of chance.

It allows to carry out calculations taking into account all the physical magnitudes that come into play when the particle beam making up the radiation acts on the patient. Leticia Rojas Calderón´s doctoral thesis "Dosimetría Monte Carlo en geometría simples con interfaces: aplicaciones en radioterapia" (Dosimetry Monte Carlo in simple geometries with interfaces: applications in radiotherapy) studies –under the supervision of the Professor of the University of Granada (Universidad de Granada, [http://www.ugr.es]) Antonio M. Lallena Rojo– aspects related to dosimetry of different treatments with radiotherapy through simulations carried out with Monte Carlo.

“We intend to detect the implications of the interfaces and the different materials surrounding the tumor in the dosimetry of the troubles in question”, Lallena points out. In many cases, calculations are carried out without considering the interfaces. However, in the human body there are different materials that influence the final dose placed on the tumors.

They have centred on three kinds of troubles which have in common the presence of interfaces. Thus, the so-called craniopharyngiomas have been studied with a concentric-sphere model to take into account the different materials. Such tumors appearing inside the head are usually treated injecting gel-shaped radionuclides, causing their reduction or disappearance. The habitual practice is carrying out the dosimetry by analytical calculations, considering that all the region of interest is the same material, tender tissue or water.

"Gamma Knife"

The second subject tackled is synovial membrane inflammation in knees, with the appearance of additional tissue causing pain to the patient. Such affection can also be treated with gel-shaped radionuclides. Finally, Monte Carlo tool has been applied in the analysis of the "Gamma Knife" instrument, used in treatment of brain radiosurgery.

In this case, radiation is emitted from outside and the brain interface has been considered to observe how affects the final dose applied to the treated lesion. The patient´s head is modelled like a water sphere with a surface simulating the brain.

With these works of the Department of Modern Physics of the UGR [http://www.ugr.es], “we intend to get to know as exactly as possible the real dose reaching the area that receives the treatment and, on the other hand, to improve dosimetric calculations”. This reserach work is the previous step, basic and necessary, to carry out later research works to establish the appropriate doses for the treatments. In this line, the Department has three more doctoral theses under way as well as keeps a collaboration with the group of Radiobiology of the Faculty of Medicine to observe tumor growth and the optimum treatments against them.

Antonio Marín Ruiz | alfa
Further information:
http://prensa.ugr.es/prensa/research/index.php

More articles from Studies and Analyses:

nachricht The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig

nachricht Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Antarctic landscape insights keep ice loss forecasts on the radar

20.11.2017 | Earth Sciences

Filling the gap: High-latitude volcanic eruptions also have global impact

20.11.2017 | Earth Sciences

Water world

20.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>