Sökning: "volumetric-modulated arc therapy"
Visar resultat 1 - 5 av 7 avhandlingar innehållade orden volumetric-modulated arc therapy.
1. Multicriteria optimization for managing tradeoffs in radiation therapy treatment planning
Sammanfattning : Treatment planning for radiation therapy inherently involves tradeoffs, such as between tumor control and normal tissue sparing, between time-efficiency and dose quality, and between nominal plan quality and robustness. The purpose of this thesis is to develop methods that can facilitate decision making related to such tradeoffs. LÄS MER
2. On Quality in Radiotherapy Treatment Plan Optimisation
Sammanfattning : Radiotherapy is one of the essential treatments used in the fight against cancer. The goal of radiotherapy is to deliver a high dose of ionising radiation to the tumour volume and at the same time minimise the effect on healthy tissue by reducing the radiation to critical organs. LÄS MER
3. Dosimetric effects of breathing motion in radiotherapy
Sammanfattning : The goal of radiotherapy is to deliver a homogeneous high dose of radiation to a tumour while minimising the dose to the surrounding healthy tissue. To achieve this, increasingly advanced treatment techniques, such as volumetric modulated arc therapy (VMAT) and proton therapy, have been developed. LÄS MER
4. lntrafractional motion effects during stereotactic body radiation therapy of lung tumors
Sammanfattning : Abstract: Patient shifts and tumor motions occurring during stereotactic body radiation therapy (SBRT) have been analyzed to determine the related effects on the delivered dose. Methods: 4-dimensional computed tomography series were retrospectively reviewed to characterize respiratory-induced lung tumor motions in 126 patients. LÄS MER
5. Evaluation of absorbed dose uncertainty in modulated radiotherapy plans
Sammanfattning : The purpose of this work was to develop and evaluate methods to meet the challenges of quality control (QC) for modulated radiotherapy plans. It was shown that nine of 15 intensity modulated radiotherapy (IMRT) plans, with deliberately introduced dose errors larger than 5% in at least one evaluated dose volume histogram (DVH) metric, were not detected with a QC method which combined Delta4 (ScandiDos) measurements and internationally recommended criteria for evaluation (Paper I). LÄS MER