Sökning: "Ionizing radiation"

Visar resultat 1 - 5 av 66 uppsatser innehållade orden Ionizing radiation.

  1. 1. osimetric impact of system spe cific geometric distortion on head and neck treatment plans in MRI only based radiation therapy

    Master-uppsats,

    Författare :Jesper Brovall; [2022-01-13]
    Nyckelord :Medical physics; Dosimetry; MRI; Radiation therapy;

    Sammanfattning : Background/purpose:Because of the superior soft tissue contrast, in comparison withcomputed tomography (CT) data, magnetic resonance imaging(MRI) is of high interest to include in a larger extent in the ra diation therapy (RT) process. In an MRI only workflow, the CTscan is excluded and a synthetic CT is used for treatment plan ning. LÄS MER

  2. 2. DEVELOPMENT, VALIDATION AND APPLICATION OF A METHOD FOR DETERMINATION OF METABOLITE CONCENTRATIONS WITH PRECLINICAL MAGNETIC RESONANCE SPECTROSCOPY

    Master-uppsats,

    Författare :Lukas Lundholm; [2021-05-10]
    Nyckelord :Medical physics; Basis sets; Metabolites; Quantification; Animal study; MRS;

    Sammanfattning : Background: Information on the metabolic content in tissue has diagnostic and prognostic value when examining for example cancer and diseases of the brain. MR spectroscopy is a non-invasive method that allows quantification of metabolite concentrations in vivo, without the use of ionizing radiation, which makes the method highly attractive for both research and clinical applications. LÄS MER

  3. 3. FETAL DOSE ESTIMATION IN ABDOMINAL AND PELVIC CT EXAMINATIONS

    Master-uppsats,

    Författare :Olivia Carlstein; [2021-05-10]
    Nyckelord :Medical physics; Fetal dose; abdominal CT examination; pelvic CT examination; phantom measurement;

    Sammanfattning : Purpose: The purpose of this is study was to compare different methods for estimating the fetal dose, how much the different methods differ from each other and on which dose levels the fetal doses are estimated to. Theory: A radiological procedure should always be justified and in the case of a pregnant patient the justification should include both the mother and the fetus. LÄS MER

  4. 4. EVALUATION OF RADIATION DOSES USING CONE BEAM COMPUTED TOMOGRAPHY IN ENDOVASCULAR AORTIC REPAIR AND SCOLIOSIS PROCEDURES

    Master-uppsats,

    Författare :Louise Strandberg; [2021-04-06]
    Nyckelord :Medical physics; Cone beam CT; CT; EVAR; scoliosis; radiation dose; effective dose;

    Sammanfattning : Purpose: The study includes the two areas, vascular surgery and orthopedics, and focuses on endovascular aortic aneurysm repair (EVAR) and scoliosis procedures. EVAR procedures contribute to a high radiation dose to the patient and for scoliosis procedures, it is often young girls that are undergoing surgery. LÄS MER

  5. 5. Life cycle assessment of hybrid systems for rural electrification in Bolivia

    Uppsats för yrkesexamina på grundnivå, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Sandu Seres; [2021]
    Nyckelord :Diesel; Stirling; Photovoltaic; impact category;

    Sammanfattning : Bolivia is a developing country in South America. Many rural communities still lack access to electricity. The extension of the National Grid System to all rural communities is not feasible due to economic and topographic challenges as well as the environmental problems that may arise. To tackle these problems, Off-grid solutions are implemented. LÄS MER