Sökning: "dose calculation algorithms"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden dose calculation algorithms.

  1. 1. Scenario Dose Calculation for Robust Optimization in Proton Therapy Treatment Planning

    Master-uppsats, Lunds universitet/Matematik LTH

    Författare :Johan Sundström; [2021]
    Nyckelord :cancer; radiation therapy; proton therapy; treatment planning; robust optimization; dose calculation algorithms; scenarios; patient setup; range error; organ motion; pencil beam scanning; computational efficiency; range-corrected dose-mapping; Mathematics and Statistics;

    Sammanfattning : Robust optimization plays a vital role in proton therapy treatment planning. A monoenergetic beam of protons has a finite range and delivers most of its dose at some specific depth in the patient. This allows the design of treatments that mainly damage the tumor and not any surrounding tissue. LÄS MER

  2. 2. Investigation of a Collapsed Cone Superposition Algorithm for dosimetry in brachytherapy

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :Freja Alpsten; [2021]
    Nyckelord :Brachytherapy; Collapsed Cone; Model-Based Dose Calculation Algorithms; Radiotherapy;

    Sammanfattning : Background & Purpose: The current standard dosimetry in brachytherapy treatment planning, the TG-43 formalism, ignore the presence of non-water media and finite patient dimensions. This can cause clinically relevant errors in dose estimates. LÄS MER

  3. 3. Validation of Ion Therepy Dose Calculation Algorithms by Monte Carlo

    Master-uppsats, KTH/Fysik

    Författare :Staffan Engdahl; [2015]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  4. 4. Three material decomposition in dual energy CT for brachytherapy using the iterative image reconstruction algorithm DIRA : Performance of the method for an anthropomorphic phantom

    Master-uppsats, Linköpings universitet/Linköpings universitet/Institutionen för medicinsk teknikTekniska högskolan

    Författare :Robin Westin; [2013]
    Nyckelord :DECT; Iterative reconstruction; Tissue decomposition; Numerical stability; Uncertainty propagation;

    Sammanfattning : Brachytherapy is radiation therapy performed by placing a radiation source near or inside a tumor. Difference between the current water-based brachytherapy dose formalism (TG-43) and new model based dose calculation algorithms (MBSCAs) can differ by more than a factor of 10 in the calculated doses. LÄS MER

  5. 5. Commissioning and validation of small subfields in Step-and-shoot IMRT

    Uppsats för yrkesexamina på grundnivå, Stockholms universitet/Medicinsk strålningsfysik (tills m KI)

    Författare :Nils Andræ; [2008]
    Nyckelord :Radiotherapy Planning; Radiotherapy; Intensity-Modulated; IMRT; Commissioning; Small fields;

    Sammanfattning : One of the most used irradiation techniques in modern radiation therapy is step-and-shoot IMRT. The accuracy of this technique when delivering complex dose distributions strongly depends on the size of the subfields. LÄS MER