Essays about: "OARS"

Showing result 6 - 10 of 16 essays containing the word OARS.

  1. 6. Evaluation of margins and plan robustness for proton therapy of unilateral tonsil cancer.

    University essay from Umeå universitet/Institutionen för fysik; Umeå universitet/Institutionen för strålningsvetenskaper

    Author : Josefine Grefve; [2021]
    Keywords : ;

    Abstract : During proton therapy both target volumes and healthy tissue, including organs at risk (OARs), receives radiation dose. Thus, radiotherapy is a trade-off between good target coverage and OAR sparing. For protons, most of the dose is deposited right before it is stopped, a phenomenon termed the Bragg peak. READ MORE

  3. 7. Automation of robust Pareto front-based radiotherapy treatment planning for prostate cancer patients

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Niklas Eliasson; [2019]
    Keywords : Medicine and Health Sciences;

    Abstract : Purpose/objective The main objective was to create a software that automates the process of creating treatment plans used for Pareto front-based dose planning for prostate cancer patients. A second objective/purpose was to add a robustness test to this program to evaluate the effect of prostate movements on the treatment plans. READ MORE

  4. 8. Towards unification of organ labeling in radiation therapy using a machine learning approach based on 3D geometries

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Giorgio Ruffa; [2019]
    Keywords : ;

    Abstract : In radiation therapy, it is important to control the radiation dose absorbed by Organs at Risk (OARs). The OARs are represented as 3D volumes delineated by medical experts, typically using computed tomography images of the patient. READ MORE

  5. 9. Spatial Frequency-Based Objective Function for Optimization of Dose Heterogeneity in Grid Therapy

    University essay from Stockholms universitet/Fysikum

    Author : Fredén Emil; [2019]
    Keywords : Radiotherapy; Dose Optimization; Objective function; Dose Heterogeneity; Proton Grid Therapy; Spatially Fractionated Radiotherapy; SFRT;

    Abstract : In this project we introduced a spatial frequency-based objective function for optimization of dose distributions used in spatially fractionated radiotherapy (also known as grid therapy). Several studies indicate that tissues can tolerate larger mean doses of radiation if the dose is delivered heterogeneously or to a partial volume of the organ. READ MORE

  6. 10. A comparative treatment planning study of radiotherapy of clinical liver- and stomach-cancer cases with either photon or proton beams

    University essay from Stockholms universitet/Fysikum

    Author : Gracinda Mondlane; [2014]
    Keywords : ;

    Abstract : There has been an increasing interest in proton beam therapy (PBT) in recent years related to the advantageous depth-dose characteristics of proton beams compared to what is achievable with standard external photon beam radiotherapy (RT). With PBT, improved target dose conformity can be achieved together with a reduction in the dose to the organs at risk (OARs). READ MORE