Sökning: "radiofysik"

Visar resultat 6 - 10 av 69 avhandlingar innehållade ordet radiofysik.

  1. 6. Integration of MRI into the radiotherapy workflow

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Joakim Jonsson; Tufve Nyholm; Mikael Karlsson; Magnus Karlsson; Uulke van der Heide; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; magnetic resonance imaging; radiotherapy; treatment planning; image registration; workflow; radiofysik; radiation physics;

    Sammanfattning : The modern day radiotherapy treatments are almost exclusively based on computed tomography (CT) images. The CT images are acquired using x-rays, and therefore reflect the radiation interaction properties of the material. LÄS MER

  2. 7. Optimization of radiation therapy planning using physical and biological objective functions

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Patric Källman; [1992]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radiation Physics; radiofysik;

    Sammanfattning : The aim of radiation therapy is to eradicate all clonogenic tumour cells without causing severeinjury in normal tissues. Optimization of treatment planning means finding the most preferabletreatment prescription. During the recent years new methods for optimization that aim at solving theinverse problem in radiation therapy have been developed. LÄS MER

  3. 8. Optimizing experimental radioimmunotherapy investigating the different mechanisms behind radiation induced cell deaths

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Theres Lindgren; David Eriksson; Torgny Stigbrand; Bo Stenerlöw; [2013]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; mitotic catastrophe; senescence; cell cycle checkpoint; apoptosis; radiation; gene expression; p53; immunologi; Immunology; radiofysik; radiation physics;

    Sammanfattning : Background. Radiation therapy is an important treatment regimen for malignant disease. Radiation therapy uses ionizing radiation to induce DNA damage in tumor cells in order to kill them. LÄS MER

  4. 9. Energy and intensity modulated radiation therapy with electrons

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Lennart Olofsson; Mikael Karlsson; Magnus Karlsson; Björn Zackrisson; Erik Traneus; [2005]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radiation sciences; Radiation therapy; Conformal therapy; IMRT; Electrons; Electron treatment head; Electron MLC; Bremsstrahlung reduction; Integral dose; Penumbra; Output factor; Strålningsvetenskap; MEDICINE Physiology and pharmacology Radiological research Radiation biology; MEDICIN Fysiologi och farmakologi Radiologisk forskning Strålningsbiologi; radiofysik; radiation physics;

    Sammanfattning : In recent years intensity modulated radiation therapy with photons (xIMRT) has gained attention due to its ability to reduce the dose in the tissues close to the tumour volume. However, this technique also results in a large low dose volume. LÄS MER

  5. 10. Theoretical modelling of tumour oxygenation and influences on treatment outcome

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Iuliana Toma-Dasu; Mikael Karlsson; Svensson Hans; J F Fowler; Borivoj Vojnovic; [2004]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radiation sciences; Computer simulation; Electrode; Polarographic measurements; Tumour oxygenation; Hypoxia; Strålningsvetenskap; MEDICINE Physiology and pharmacology Radiological research Radiation biology; MEDICIN Fysiologi och farmakologi Radiologisk forskning Strålningsbiologi; radiofysik; radiation physics;

    Sammanfattning : One of the main problems in curing cancer resides in the different microenvironment existing in tumours compared to the normal tissues. The mechanisms of failure are different for radiotherapy and chemotherapy, but they all relate to the poor blood supply known to exist in tumours. LÄS MER