Sökning: "Organs at risk"

Visar resultat 1 - 5 av 71 uppsatser innehållade orden Organs at risk.

  1. 1. STANDARDIZED ORGAN AT RISK VOLUME FOR EXTERNAL BEAM RADIATION THERAPY IN PROSTATE CANCER AND ITS RELATIONSHIP TO VOLUMES DEFINED BY CLINICAL PRACTICE

    Master-uppsats,

    Författare :Dang Thao; [2022-01-13]
    Nyckelord :Medical physics; Radiation therapy; Prostate cancer; Organs at risk;

    Sammanfattning : Background/ Purpose: In radiation therapy (RT), the radiation dose calculated in tumours and normal tissue depends on how the volumes are defined. It is difficult to standardize how tumour volumes should be defined because their anatomical extension can differ greatly between individuals. LÄS MER

  2. 2. " Optimization of Margins and Plan Robustness for Proton Therapy of Hodgkin’s Lymphoma"

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Filip Hörberger; [2022]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Purpose/Background: Utilizing proton therapy (PT) for treatment of Hodgkin’s lymphoma (HL) has demonstrated favorable features, particularly a reduced dose to organs at risk (OAR) in comparison with photon radiotherapy. However, there is a coherent complexity with PT including its uncertainties, such as range-uncertainties and set-up variations as protons are highly sensitive to tissue density variations within the beam-path. LÄS MER

  3. 3. Surface Guided Helical Tomotherapy for Total Marrow Irradiation

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Hedda Enocson; [2022]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background: Total marrow irradiation (TMI) with helical tomotherapy treatment (HT-TMI) can be used as conditioning regimen for leukemia patients prior to stem cell transplantation by radiating the skeletal tissue. To ensure adequate dose coverage a margin is applied to the clinical target volume (CTV), i.e. planning target volume (PTV) margin. LÄS MER

  4. 4. Incidens av hypoxemi och hypotension hos hund under anestesi vid kejsarsnitt : djursjukskötarens roll i förebyggande omvårdnad

    Uppsats för yrkesexamina på grundnivå, SLU/Dept. of Clinical Sciences

    Författare :Petra Helsén; Elin Strömblad; [2022]
    Nyckelord :blodtryck; dystoki; MAP; raser; SpO₂; syremättnad; tikar;

    Sammanfattning : Uppskattningsvis 26 % av dräktiga tikar drabbas av dystoki. Åtgärder för dystoki inkluderar kejsarsnitt, medicinsk behandling och manuell korrigering. Den bakomliggande orsaken avgör lämplig behandling men i 50–65 % av fallen behöver tiken förlösas med kejsarsnitt. LÄS MER

  5. 5. COMPARISON OF MULTI-CRITERIA OPTIMIZATION IN TWO DIFFERENT TREATMENT PLANNING SYSTEMS

    Master-uppsats,

    Författare :Anna Lindström; [2021-05-10]
    Nyckelord :Medical physics; Multi-criteria optimization; Pareto front; volumetric modulated arc therapy; head and neck cancer; prostate cancer;

    Sammanfattning : Purpose: The purpose with this study was to compare multi-criteria optimization (MCO) for volumetric modulated arc therapy (VMAT) treatment plans in two different treatment planning systems. Theory: When performing treatment planning prior to radiation therapy it is important to prioritize between absorbed dose to target and absorbed dose to organs at risk (OAR). LÄS MER