Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"planning target volume"”.
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Development of A Beam-Specific Planning Target Volume and A Robust Plan Analysis to ol For Proton Therapy
… management of the uncertainties during treatment planning of proton therapy has been similar to that of conventional photon therapy. <strong>The goal of this dissertation research was to develop a treatment planning method and a planevaluation method that address proton-specific issues regarding …
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Evaluation of target motion and determination optional treatment margins for prostate cancer treated with external beam radiotherapy on Halcyon
… set-up error, margins are used in radiotherapy planning. These are essential for the delivery of safe and effective treatment. Aim and Setting To measure prostate motion during the course of EBRT on the HalcyonTM at Groote Schuur Hospital. Using published margin recipes, the minimum clinical …
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Development and Implementation of An Anthropomorphic Head & Neck Phantom For The Assessment of Proton Therapy Treatment Procedures
… therapy is to deliver a high dose to the planning target volume (PTV) with minimal exposure and damage to the surrounding healthy tissue. Protons offer a unique advantage over photon radiotherapy in that they deposit dose over a finite range, in contrast to the more gradual energy …
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DOSE-BASED EVALUATION OF A PROSTATE BED PROTOCOL
… delivered dose is reconstructed by deforming the planning CT to the CBCT images acquired at each fraction, computing dose on the deformed images, and inversely transforming the dose back to the original geometry. The treatments of six patients were evaluated under four scenarios: no guidance …
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Evaluation of The Effectiveness of Anisotropic Analytical Algorithm In Flattened and Flattening-Filter-Free Beams For High Energy Lung Dose Delivery Using The Radiological Physics Center Lung Phantom
… (AAA) implemented in the Eclipse treatment planning system (TPS) was evaluated using theRadiologicalPhysicsCenteranthropomorphic lung phantom using both flattened and flattening-filter-free high energy beams. Radiation treatment plans were developed following the Radiation Therapy Oncology …
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Incorporating range uncertainty into proton therapy treatment planning
… issue of robustness in proton therapy treatment planning for cancer treatment. Proton therapy is considered to be advantageous in treating most childhood cancers and certain adult cancers, including those of the skull base, spine and head and neck. Protons, unlike X-rays, have a finite range …
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Improvements In Robustness and Optimality of Intensity-Modulated Proton Therapy Plans For Lung Cancer Patients With 4-Dimensional Robust Optimization
… associated with breathing motion in treatment planning. The primary objective of this research was to develop a novel four-dimensional robust optimization (4DRO) method and find an appropriate optimization strategy to make IMPT dose distributions less sensitive to both respiratory motion as …
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Active Breathing Control (ABC) : Messung und Reduktion von ateminduzierten Organbewegungen des Thorax
PURPOSE: Extensive radiotherapy volumes for tumors of the chest are partly caused by interfractional organ motion. We evaluated the feasibility of respiratory observation tools using the active breathing control (ABC) system and the effect on breathing cycle regularity and reproducibility.METHODS …
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Imaging Techniques for Proton Range Determination in Proton Therapy
… (SPR) is required for proton therapy treatment planning. The current standard practice is to map SPR from Hounsfield Unit (HU) values of a single-energy computed tomography (SECT) scan through a stoichiometric calibration technique. This technique is subjected to a variety of factors that …
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Optimization of Image Guided Radiation Therapy for Lung Cancer Using Limited-angle Projections
… promote the necessity of more accurate treatment target localization and tracking. On-board imaging techniques, especially the x-ray based techniques, have found a great popularity nowadays for on-board target localization and tracking. With an objective to improve the accuracy of on-board imaging …
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A new prompt gamma spectroscopy-based approach for range verification in proton therapy
… equal to the value prescribed by the Treatment Planning System (TPS). However, there are sizeable uncertainties at the time of irradiation due to anatomical modifications, patient alignment, beam delivery, and dose calculation. Treatment plans are optimized to be conformal in terms of target …