Sökning: "Reference dose"

Visar resultat 1 - 5 av 47 uppsatser innehållade orden Reference dose.

  1. 1. Radiotherapy treatment strategy for prostate cancer with lymph node involvement

    Master-uppsats, Umeå universitet/Institutionen för fysik

    Författare :Amanda Östensson; [2023]
    Nyckelord :Radiotherapy; prostate cancer; lymph node; gold fiducial marker; multiple target;

    Sammanfattning : Radiotherapy is a common and useful method for treating prostate cancer, often using gold fiducial markers in the prostate as guidance. However, when there is a high risk of lymph node involvement, the independent motion of volumes causes complications in patient positioning since there is a choice between position against the gold fiducial markers or the bone anatomy. LÄS MER

  3. 2. Evaluation of the DXA radiation environment at Sahlgrenska University Hospital

    Master-uppsats,

    Författare :Saga Söderholm; [2022-05-18]
    Nyckelord :Medical physics; DXA; DEXA; Dual-energy X-ray absorptiometry; Bone mineral density;

    Sammanfattning : Purpose: The aims of this work were to evaluate the radiation environment in the dual-energy X-ray absorptiometry (DXA) rooms at Sahlgrenska University Hospital, estimate personnel doses, determine legal requirements for DXA personnel, examine the operators’ view on radiation safety and develop material with dose information for patients and operators. Theory: DXA is a low dose X-ray modality mainly used in osteoporosis examinations, for which it is considered the reference technique. LÄS MER

  4. 3. 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 with computed 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 CT scan is excluded and a synthetic CT is used for treatment plan ning. LÄS MER

  5. 4. Does in vivo exposure to perfluorooctanesulfonicacid induce an altered colonic barrier function inmice?

    Kandidat-uppsats, Örebro universitet/Institutionen för medicinska vetenskaper

    Författare :Hanna-Dalia Laar; [2022]
    Nyckelord :PFOA; PFAS; Ulcerative colitis; colon barrier; gastrointestinal permeability; Ussing Chamber;

    Sammanfattning : Background: Several environmental risk factors have been implicated in the pathogenesis ofinflammatory bowel disease (IBD) and might cause an altered barrier function, a hallmark ofIBD. Recent evidence suggests that patients with late-onset ulcerative colitis (UC) have anincreased serum level of perfluoroalkyl substances (PFAS), one of the major chemical groupscontaminating our diet. LÄS MER

  7. 5. Effects of plant polar lipids on postprandial glycemic regulation in healthy humans

    Master-uppsats, Lunds universitet/Livsmedelsteknik och nutrition (master)

    Författare :Yijia Yao; [2022]
    Nyckelord :plant polar lipid; meal study; clinical study; postprandial glycemic regulation; applied nutrition and food chemistry; Technology and Engineering;

    Sammanfattning : In light of diabetes becoming a global discussion topic, some steps ought to be taken to help reduce the number of individuals suffering from the disease. Keeping good glycemic control through a healthy diet helps prevent diabetes and cardiovascular disease. Plant lipids are increasingly being studied for their postprandial effects on humans. LÄS MER