Essays about: "strålterapi"

Showing result 21 - 25 of 65 essays containing the word strålterapi.

  1. 21. Direct optimization of dose-volume histogram metrics in intensity modulated radiation therapy treatment planning

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Tianfang Zhang; [2018]
    Keywords : Optimization; intensity-modulated radiation therapy; DVH functions; dose-at-volume; volume-at-dose; value-at-risk; smooth approximation; kernel density estimation; fluence map optimization; Optimering; intensitetsmodulerad strålterapi; DVH-funktioner; dose-at-volume; volumeat- dose; value-at-risk; slätapproximation; ickeparametrisk skattning; fluensoptimering;

    Abstract : In optimization of intensity-modulated radiation therapy treatment plans, dose-volumehistogram (DVH) functions are often used as objective functions to minimize the violationof dose-volume criteria. Neither DVH functions nor dose-volume criteria, however,are ideal for gradient-based optimization as the former are not continuously differentiableand the latter are discontinuous functions of dose, apart from both beingnonconvex. READ MORE

  3. 22. Evaluation of Tomodirect for treatment of thoracic and abdominal cases

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Sara Talozi; [2018]
    Keywords : Medicine and Health Sciences;

    Abstract : Sedan 1970-talet har antalet rapporterade cancerfall dubblerats, dels på grund av förändrade levnadsvanor och dels på grund av bättre screeningmetoder som upptäcker cancern i tidigt skede. Tidig upptäckt av cancern i kombination med utvecklad cancerbehandling har bidragit till att risken för att avlida av cancer har minskat. READ MORE

  4. 23. Robust optimization of radiotherapy treatment plans considering time structures of the delivery

    University essay from Uppsala universitet/Avdelningen för datalogi

    Author : Erik Orvehed Hiltunen; [2018]
    Keywords : Radiation therapy; optimization; interplay effect; lung cancer; 4DCT; RayStation; Strålterapi; optimering; interplay; lungcancer;

    Abstract : Cancer is the second largest mortal disease in Sweden, and high efforts are made to develop the treatment of cancer. One of the main treatment methods is radiotherapy, which uses ionizing radiation to damage the cancerous cells. This has the chance of stopping the cell reproduction, and the goal is to reduce the tumor and stop the tumor growth. READ MORE

  5. 24. Mathematical Optimization of Radiation Therapy Goal Fulfillment

    University essay from Uppsala universitet/Institutionen för informationsteknologi

    Author : Björn Andersson; [2017]
    Keywords : Radiation Therapy; Optimization; Clinical goals; Strålterapi; Optimering; Kliniska mål;

    Abstract : Cancer is one of the deadliest diseases today, and with increasingly larger and older populations, cancer constitutes an enormous contemporary and future challenge. Luckily, advances in technology and medicine are continuously contributing to a decrease in cancer mortality, and to the reduction of treatment side effects. READ MORE

  6. 25. In-beam proton range monitoring during proton therapy : a Monte Carlo study on the feasibility of secondary gamma imaging

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Gustaf Lönn; [2016]
    Keywords : ;

    Abstract : Proton radiation therapy allows for delivering a high dose to a well-confinedregion of interest due to the characteristic proton dose deposition. Due to protonrange straggling, anatomic variations in patients and small patient setup errors,treatment plans needs to account for proton range uncertainties of up to 3.5% invivo. READ MORE