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.
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
Smart Data Transformation – Surfing the Big Wave
02.12.2016 | Fraunhofer-Institut für Angewandte Informationstechnik FIT
Climate change could outpace EPA Lake Champlain protections
18.11.2016 | University of Vermont
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine