Essays about: "ımrt"

Showing result 1 - 5 of 21 essays containing the word ımrt.

  1. 1. 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

  3. 2. MRI only radiotherapy using synthetic CT images: Dosimetric accuracy and patient positioning strategies in an MRI only workflow

    University essay from Lunds universitet/Sjukhusfysikerutbildningen; Lunds universitet/Medicinsk strålningsfysik, Lund

    Author : Emilia Persson; [2015]
    Keywords : Medicine and Health Sciences;

    Abstract : Background and purpose: Magnetic resonance imaging (MRI) only radiotherapy has, due to superior soft tissue contrast of MRI and the possible reduction of systematic uncertainties, grown into a promising technique. The purpose of this work is to investigate parts of an MRI only workflow with synthetic computed tomography (sCT) images generated from MRI. READ MORE

  4. 3. Breathing interplay effects during Tomotherapy. A 3D gel dosimetry study

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Anna Ljusberg; [2013]
    Keywords : Medicine and Health Sciences;

    Abstract : Tomotherapy delivers intensity modulated radiation therapy, IMRT, which enables highly advanced treatment plans with homogenous absorbed dose coverage of the target with sharp dose gradients to spare surrounding healthy tissue. Helical tomotherapy consists of a linear accelerator mounted on a rotating gantry, the construction is similar to a CT although the energy is in the MV-range instead of kV and extra collimators and beam stopper are inserted [1-3]. READ MORE

  5. 4. An Integer Programming Approach to Conversion from Static to Continuous Delivery of Intensity Modulated Radiation Therapy

    University essay from KTH/Optimeringslära och systemteori

    Author : Elin Hynning; [2011]
    Keywords : ;

    Abstract : The aim of this thesis is to generate a starting guess for volumetric modulated arc therapy (VMAT) plan optimization by using data from an intensity modulated radiation therapy (IMRT) plan. We develop a mixed-binary linear programming model, based on choosing segments among a set of predefined segments. READ MORE

  6. 5. Silicon Diode Dose Response Correction in Small Photon Fields

    University essay from Medicinsk strålningsfysik (tills m KI)

    Author : Artur Omar; [2010]
    Keywords : Radiotherapy; Silicon diode; Dosimetry; Dose response correction; Small field; Strålterapi; Kiseldiod; Dosimetri; Dos-respons korrektion; Små fält;

    Abstract : Silicon diodes compared to other types of dosimeters have several attractive properties, such as an excellent spatial resolution, a high sensitivity, and clinically practical to use. These properties make silicon diodes a preferred dosimeter for relative dosimetry for several types of measurements in small field dosimetry, e.g. READ MORE