Sökning: "multi-leaf collimator"

Hittade 4 avhandlingar innehållade orden multi-leaf collimator.

  1. 1. Methods for selection and optimisation of radiotherapy and early therapy evaluation in breast cancer

    Författare :Tomas Jansson; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Oncology; Breast cancer; human; radiotherapy; multi-leaf collimator; breast-conservingsurgery; local recurrence; p53; positron emission tomography; chemotherapy evaluation; Onkologi; Oncology; Onkologi; Oncology; onkologi;

    Sammanfattning : Adjuvant systemic therapy for breast cancer, the most common malignancy in females, increases survival and this has recently also been demonstrated for postoperative radiotherapy. The aims of this study were to develop an optimised radiotherapeutic technique for postoperative treatment, to analyse the association between p53 status in node-negative patients and radiotherapy, to investigate the incidence of in-breast relapses after conservative surgery and radiotherapy and to determine if positron emissiontomography could be useful for early evaluation of polychemotherapy. LÄS MER

  3. 2. Towards elimination of anal-sphincter and rectal dysfunction after radiation therapy for prostate cancer

    Författare :Massoud al-Abany; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Fecal leakage; rectal bleeding; defecation urgency; diarrhea; dose; volume; and potency.;

    Sammanfattning : Background: External radiation therapy is one of the best management options available for localized prostate cancer. The higher the radiation therapy dose administered, the more likely local control will be obtained, but the radiation dose that can be given is limited by the need to restrict the frequency and severity of unwanted effects. LÄS MER

  4. 3. Beam Modelling for Treatment Planning of Scanned Proton Beams

    Författare :Peter Kimstrand; Bengt Glimelius; Erik Traneus; Nina Tilly; Anders Ahnesjö; Thomas Bortfeld; Uppsala universitet; []
    Nyckelord :Radiation sciences; proton therapy; treatment planning; beam modelling; dose calculation; Monte Carlo; Strålningsvetenskap;

    Sammanfattning : Scanned proton beams offer the possibility to take full advantage of the dose deposition properties of proton beams, i.e. the limited range and sharp peak at the end of the range, the Bragg peak. LÄS MER

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

    Författare :Lennart Olofsson; Mikael Karlsson; Magnus Karlsson; Björn Zackrisson; Erik Traneus; Umeå universitet; []
    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; Radiation biology; 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