Essays about: "Organs-at-risk"

Showing result 6 - 10 of 36 essays containing the word Organs-at-risk.

  1. 6. COMPARISON OF MULTI-CRITERIA OPTIMIZATION IN TWO DIFFERENT TREATMENT PLANNING SYSTEMS

    University essay from

    Author : Anna Lindström; [2021-05-10]
    Keywords : Medical physics; Multi-criteria optimization; Pareto front; volumetric modulated arc therapy; head and neck cancer; prostate cancer;

    Abstract : Purpose: The purpose with this study was to compare multi-criteria optimization (MCO) for volumetric modulated arc therapy (VMAT) treatment plans in two different treatment planning systems. Theory: When performing treatment planning prior to radiation therapy it is important to prioritize between absorbed dose to target and absorbed dose to organs at risk (OAR). READ MORE

  3. 7. Image Processing in MRI Guided Real-TimeAdaptive Radiotheraphy - Upsampling and Segmentation of Target Volume and Organs at Risk

    University essay from Uppsala universitet/Institutionen för informationsteknologi

    Author : Shreyas Shivakumara; [2021]
    Keywords : ;

    Abstract : Magnetic Resonance Imaging (MRI) is a useful medical imaging technique that is used for cancer treatment.The major drawback of this method is the relatively long scan time, limiting its use for real time tracking of a potentially moving target during the radiotherapy session. READ MORE

  4. 8. Deep-learning based prediction model for dose distributions in lung cancer patients

    University essay from Stockholms universitet/Fysikum

    Author : Terese Hellström; [2021]
    Keywords : ;

    Abstract : Background To combat one of the leading causes of death worldwide, lung cancer treatment techniques and modalities are advancing, and the treatment options are becoming increasingly individualized. Modern cancer treatment includes the option for the patient to be treated with proton therapy, which can in some cases spare healthy tissue from excessive dose better than conventional photon radiotherapy. READ MORE

  5. 9. Reinforcement learning applied to MLC tracking

    University essay from KTH/Medicinteknik och hälsosystem

    Author : Adithya Raju Ganeshan; [2021]
    Keywords : Reinforcement Learning; Multileaf Collimator; Magnetic Resonance Imaging; Adaptive Radiotherapy;

    Abstract : Radiotherapy has become an ever more successful treatment option for cancer.Advances in imaging protocols combined with precise therapy devices suchas linear accelerators contribute towards millimeter precision of treatmentdelivery with far fewer side effects. READ MORE

  6. 10. 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